Service Manual
DXi Advanced Reporting 2.3
0-13766-06 Rev A
Quantum DXi Advanced Reporting Service Manual, 0-13766-06 Rev A, November 2013, Product
of USA.
Quantum Corporation provides this publication “as is” without warranty of any kind, either
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Contents
Preface
Chapter 1
ix
Advanced Service Reports
1
Service Reports and Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Service Report Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Data Ingest per Week Report . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Data Ingest per Day Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Disk I/O Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Disk I/O SG details Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Disk I/O Usage Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Disk I/O SG Usage Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Full Overview Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Replication Details Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Dedupe Details Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Memory Report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Blockpool Stats Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Pcache Stats Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Self Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Appendix A
DXi Advanced Reporting for Service Repository
35
Repository Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Quantum DXi Advanced Reporting Service Manual
iii
Contents
Accessing the Repository . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Uploading Data to the Repository . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Exporting the Logging Database. . . . . . . . . . . . . . . . . . . . . . . 38
Uploading Exported Data to the Repository . . . . . . . . . . . . . . 40
Glossary
iv
43
Quantum DXi Advanced Reporting Service Manual
Figures
Figure 1
Service Reports Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 2
Disk I/O BlockPool_D Graph . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3
Disk I/O Data Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4
Disk I/O BlockPool_D1 Graph . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5
Disk I/O A9_Data Graph . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 6
Disk I/O Usage Data Graph . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 7
Disk I/O Usage Metadata Graph . . . . . . . . . . . . . . . . . . . . 15
Figure 8
Disk I/O Usage SSD Graph. . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9
Disk I/O Usage System Graph . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10
Namespace Replication % Complete Graph . . . . . . . . . . . 18
Figure 11
Replication Queue Length Graph . . . . . . . . . . . . . . . . . . . 19
Figure 12
Namespace Replication Queue Length Graph . . . . . . . . . . 20
Figure 13
Namespace Replication Speed in Tags/min 
(logarithmic) Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 14
Namespace Replication Speed in Tags/min 
(linear) Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 15
Continuous Replication % Complete Graph . . . . . . . . . . . 21
Figure 16
Continuous Replication Queue Length Graph . . . . . . . . . . 22
Quantum DXi Advanced Reporting Service Manual
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Figures
vi
Figure 17
Continuous Replication Speed in Tags/min 
(logarithmic) Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 18
Continuous Replication Speed in Tags/min (linear) Graph 22
Figure 19
Memory usage Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 20
Swap usage Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 21
Blockpool Volume Overview Graph . . . . . . . . . . . . . . . . . 25
Figure 22
Blockpool Throughput Graph . . . . . . . . . . . . . . . . . . . . . . 26
Figure 23
Non dedup Throughput Graph . . . . . . . . . . . . . . . . . . . . . 27
Figure 24
Pcache Pages Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 25
Pages Queued for Write Graph . . . . . . . . . . . . . . . . . . . . . 29
Figure 26
Unreferenced Pages Graph . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 27
Unreferenced Dirty Pages Graph. . . . . . . . . . . . . . . . . . . . 30
Figure 28
Bytes Open Files Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 29
Bytes Read Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 30
Bytes Written Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 31
Bytes Spilled Graph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 32
Logging Loop Time Graph . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 33
DXi Advanced Reporting for Service Repository . . . . . . . . 37
Figure 34
DB Export button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 35
Database Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 36
DB Export Completed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 37
Exporting the Logging Database . . . . . . . . . . . . . . . . . . . 40
Quantum DXi Advanced Reporting Service Manual
Tables
Table 1
DXi Advanced Reporting Service Reports . . . . . . . . . . . . . . 3
Quantum DXi Advanced Reporting Service Manual
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Tables
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Quantum DXi Advanced Reporting Service Manual
Preface
Quantum® DXi™ Advanced Reporting 2.3 provides performance data
logging and visual reporting and graphing features for Quantum DXi™Series systems.
This guide introduces DXi Advanced Service Reports and discusses the
following topics:
• Advanced Service Reports
• DXi Advanced Reporting for Service Repository
For more information regarding installation, navigating the
application’s remote management console, and reporting capabilities
(on demand reports and historical data reports), see the DXi Advanced
Reporting User’s Guide (6-67353).
Audience
This guide is written for DXi operators and system administrators.
Document Organization
This guide contains the following information:
• Chapter 1, Advanced Service Reports provides information that you
can use to interpret the DXi Advanced Reporting service reports that
are available to Quantum Service team members.
Quantum DXi Advanced Reporting Service Manual
ix
Preface
• Appendix A, DXi Advanced Reporting for Service Repository
provides information that describes the DXi Advanced Reporting for
Service repository.
• Glossary provides definitions of technical terms used in this
document.
Notational Conventions
This manual uses the following conventions:
Convention
Example
User input is shown in bold font.
./DARTinstall
Computer output and command
line examples are shown in
monospace font.
./DARTinstall
User input variables are enclosed in
angle brackets.
http://<ip_address>/reports/
For UNIX and Linux commands, the
command prompt is implied.
./DARTinstall
is the same as
# ./DARTinstall
File and directory names, menu
commands, button names, and
window names are shown in bold
font.
/data/upload
Menu names separated by arrows
indicate a sequence of menus to be
navigated.
Utilities > Software
The following formats indicate important information:
Note: Note emphasizes important information related to the main
topic.
Caution: Caution indicates potential hazards to equipment or data.
x
Quantum DXi Advanced Reporting Service Manual
Preface
WARNING: Warning indicates potential hazards to personal safety.
Related Documents
Contacts
The following Quantum documents are also available for DXi Advanced
Reporting and DXi systems:
Document No.
Document Title
Document Description
6-67539
Quantum DXi-Series
Release Notes
Describes information
specific to the current
release of DXi Advance
Reporting software.
6-67612
DXi V-Series User’s
Guide
Describes the operation
and administration of the
DXi V1000 and DXi V4000
virtual appliances.
6-67092
Quantum DXi4000
User’s Guide
Describes DXi4500,
DXi4600, and DXi4700
operation and
administration.
6-67199
Quantum DXi6000
User’s Guide
Describes DXi6500,
DXi6700, and DXi6800
operation and
administration.
6-67205
Quantum DXi8500
User’s Guide
Describes DXi8500
operation and
administration.
For information about contacting Quantum, including Quantum office
locations, go to:
http://www.quantum.com/aboutus/contactus/index.aspx
Quantum DXi Advanced Reporting Service Manual
xi
Preface
Getting More
Information or Help
StorageCare™, Quantum’s comprehensive service approach, leverages
advanced data access and diagnostics technologies with crossenvironment, multi-vendor expertise to resolve backup issues faster and
at lower cost.
Accelerate service issue resolution with these exclusive Quantum
StorageCare services:
• Service and Support Website – Register products, license software,
browse Quantum Learning courses, check backup software and
operating system support, and locate manuals, FAQs, software
downloads, product updates and more in one convenient location.
Benefit today at:
http://www.quantum.com/ServiceandSupport/Index.aspx
• eSupport – Submit online service requests, update contact
information, add attachments, and receive status updates via
e-mail. Online Service accounts are free from Quantum. That
account can also be used to access Quantum’s Knowledge Base, a
comprehensive repository of product support information. Sign up
today at:
http://www.quantum.com/osr
xii
Quantum DXi Advanced Reporting Service Manual
Preface
• StorageCare Guardian – Securely links Quantum hardware and the
diagnostic data from the surrounding storage ecosystem to
Quantum's Global Services Team for faster, more precise root cause
diagnosis. StorageCare Guardian is simple to set up through the
internet and provides secure, two-way communications with
Quantum’s Secure Service Center. More StorageCare Guardian
information can be found at:
http://www.quantum.com/ServiceandSupport/Services/
GuardianInformation/Index.aspx
• DXi Advanced Reporting Essential Training (online self-paced
course) – This free online course provides information on how to
install/upgrade software, navigate the GUI, work with time ranges,
and interpret reporting data. To access the online course, go to
http://www.quantum.com/ServiceandSupport/Index.aspx, select
your DXi system, click Documentation, and select DXi Advanced
Reporting Essential Training.
For further assistance, or if training is desired, contact Quantum
Customer Support Center:
United States
Toll Free: 1-800-284-5101
Toll: +1-720-249-5700
Europe, the Middle East, and
Africa (EMEA)
Toll Free: +800-7826-8888
Asia and Pacific (APAC)
Toll Free: +800-7826-8887
Toll: +49-6131-3241-1164
Toll: +603-7953-3010
For worldwide support:
http://www.quantum.com/ServiceandSupport/Index.aspx
Worldwide End-User
Product Warranty
For more information on the Quantum Worldwide End-User Standard
Limited Product Warranty:
http://www.quantum.com/pdf/QuantumWarranty.pdf
Quantum DXi Advanced Reporting Service Manual
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Preface
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Quantum DXi Advanced Reporting Service Manual
Chapter 1
Advanced Service Reports
This chapter provides information to help you understand and interpret
the DXi Advanced Reporting service reports that are hidden from end
users and are available to Quantum Service team members only. These
reports provide detailed performance information such as replication,
space reclamation, deduplication, memory, blockpool, and pcache
statistics. The service reports are also used to help evaluate the health of
a DXi-Series system and to diagnose problems.
Note: Do not share the DXi Advanced Reporting service reports with
customers. The reports contain information that is confidential
and proprietary to Quantum, including values for tags-perminute during replication and space reclamation.
This chapter contains the following sections:
• Service Reports and Graphs
• Service Report Descriptions
Quantum DXi Advanced Reporting Service Manual
1
Chapter 1: Advanced Service Reports
Service Reports and Graphs
Service Reports and Graphs
Each service report available in DXi Advanced Reporting is made up of
one or more graphs. Some graphs appear in more than one report.
After you log on to DXi Advanced Reporting as an administrator and
you click the Reports menu, a menu, similar to the following, displays.
Figure 1 Service Reports Menu
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Quantum DXi Advanced Reporting Service Manual
Chapter 1: Advanced Service Reports
Service Reports and Graphs
Note: In this example, the DXi Advanced Reporting service reports are
displayed with the yellow background. For detailed information
about the other (non-service) reports, see the DXi Advanced
Reporting User’s Guide (6-67353).
Table 1 lists the graphs associated with each report. The reports are
designated as (L) for layered graphs or (S) for stacked graphs. This
distinction does not apply to graphs that report only a single variable.
For information about interpreting each service report, see Service
Report Descriptions on page 7.
Note: Depending on the user authentication level, platform, or
software version being used, some of the reports in Table 1
may not display in the Reports menu. For example, Galaxy
1.4.2 does not support pcache, so the pcache report does not
display, and DXi 4500 and DXi 6500 do not support Fibre
Channel, so those reports do not display, etc. Depending on
the system that you are accessing, the series of graphs that are
displayed can vary.
Table 1 DXi Advanced
Reporting Service Reports
Report
Graphs
Data Ingest per Week
Report
• Blockpool Throughput
• Blockpool Throughput per week
• non dedup Throughput per week
• non dedup Throughput
Data Ingest per Day
Report
• Blockpool Throughput
• Blockpool Throughput per day
• non dedup Throughput per day
• non dedup Throughput
Quantum DXi Advanced Reporting Service Manual
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Chapter 1: Advanced Service Reports
Service Reports and Graphs
Report
Graphs
Disk I/O Report
• Disk I/O BlockPool_D
• Disk I/O BlockPool_J
• Disk I/O BlockPool_M
• Disk I/O BulkData_D
• Disk I/O BulkData_J
• Disk I/O BulkData_M
• Disk I/O System
Note: This report displays different graphs
depending on the capacity and the
type of DXi system being monitored.
Disk I/O SG details
Report
• Disk I/O BlockPool_D1
• Disk I/O BlockPool_D2
• Disk I/O BlockPool_D3
• Disk I/O BlockPool_D4
• Disk I/O BlockPool_D5
• Disk I/O BlockPool_D6
• Disk I/O BlockPool_D7
• Disk I/O BlockPool_D8
• Disk I/O BlockPool_J
• Disk I/O BlockPool_M
• Disk I/O BulkData_D1
• Disk I/O BulkData_D2
• Disk I/O BulkData_D3
• Disk I/O BulkData_D4
• Disk I/O BulkData_J
• Disk I/O BulkData_M
Note: This report displays different graphs
depending on the capacity and the
type of DXi system being monitored.
Scalable systems have different stripe
groups depending on their capacity.
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Quantum DXi Advanced Reporting Service Manual
Chapter 1: Advanced Service Reports
Service Reports and Graphs
Report
Graphs
Disk I/O Usage Report
• Disk I/O usage Data
• Disk I/O usage Metadata
• Disk I/O usage SSD
• Disk I/O usage System
Disk I/O SG Usage
Report
• Disk I/O usage Data
• Disk I/O usage Metadata
• Disk I/O usage SSD
Full Overview Report
• Data Volume Overview (L)
• Ethernet Activity (S)
• Fibre Channel Activity (S)
• CPU Load Average
• CPU stats in % (S)
• Reduction Ratio (L)
Replication Details
Report
• Namespace Replication % Complete (L)
• Flags
• Replication Queue Length
• Namespace Replication Queue Length (L)
• Namespace Replication Speed in Tags/min
(Logarithmic) (L)
• Namespace Replication Speed in Tags/min
(Linear) (L)
• Continuous Replication % Complete (L)
• Continuous Replication Queue Length
• Continuous Replication Speed in Tags/min
(Logarithmic) (L)
• Continuous Replication Speed in Tags/min
(Linear) (L)
Dedupe Details Report
• Data Volume Overview (L)
• Before Reduction
Memory Report
• Memory usage (always base 1024) (S)
• Swap usage (always base 1024) (S)
Quantum DXi Advanced Reporting Service Manual
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Chapter 1: Advanced Service Reports
Service Reports and Graphs
Report
Graphs
Blockpool Stats
Report
• Blockpool Volume Overview
• Blockpool Throughput (L)
• Non dedup Throughput (S)
Pcache Stats Report
• Pcache pages (S)
• Pages queued for write (S)
• Unreferenced pages (S)
• Unreferenced dirty pages
• Bytes Open Files
• Bytes Read
• Bytes Written
• Bytes Spilled
Self Report
• CPU Load Average
• CPU stats in % (S)
• Logging Loop Time (logarithmic scale) (S)
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Quantum DXi Advanced Reporting Service Manual
Chapter 1: Advanced Service Reports
Service Report Descriptions
Service Report Descriptions
This section describes the DXi Advanced Reporting service reports:
• Data Ingest per Week Report on page 7
• Data Ingest per Day Report on page 8
• Disk I/O Report on page 9
• Disk I/O SG details Report on page 11
• Disk I/O Usage Report on page 14
• Disk I/O SG Usage Report on page 16
• Full Overview Report on page 17
• Replication Details Report on page 17
• Dedupe Details Report on page 23
• Memory Report on page 23
• Blockpool Stats Report on page 24
• Pcache Stats Report on page 27
• Self Report on page 32
Data Ingest per Week
Report
The Data Ingest per Week report displays information about the
weekly volume of data ingested by the system and the data reduction
ratio.
Note: Depending on the user authentication level, platform, or
software version being used, this report may not display in the
Reports menu.
The report contains the following graphs:
• BlockPool Throughput
• BlockPool Throughput per Week
• Non dedup Throughput per Week
• Non dedup Throughput
Quantum DXi Advanced Reporting Service Manual
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Chapter 1: Advanced Service Reports
Service Report Descriptions
BlockPool Throughput
See Blockpool Throughput on page 25.
BlockPool Throughput per Week
This graph shows the rate per week at which data is deduplicated by
BFST through the following presentation layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
Non dedup Throughput per Week
This graph shows the rate that data is being written per week to nondeduplicating shares through the following presentation layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
Non dedup Throughput
See Non dedup Throughput on page 26.
Data Ingest per Day
Report
The Data Ingest per Day report displays information about the daily
volume of data ingested by the system and the data reduction ratio.
Note: Depending on the user authentication level, platform, or
software version being used, this report may not display in the
Reports menu.
The report contains the following graphs:
• BlockPool Throughput
• BlockPool Throughput per Day
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Chapter 1: Advanced Service Reports
Service Report Descriptions
• Non dedup Throughput per Day
• Non dedup Throughput
BlockPool Throughput
See Blockpool Throughput on page 25.
BlockPool Throughput per Day
This graph shows the rate per day at which data is deduplicated by BFST
through the following presentation layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
Non dedup Throughput per Day
This graph shows the rate that data is being written per day to nondeduplicating shares through the following presentation layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
Non dedup Throughput
See Non dedup Throughput on page 26.
Disk I/O Report
The Disk I/O report displays Disk I/O monitoring for DXi systems on a per
stripe group basis. Refer to the Disk I/O report graphs in situations
where the overall system performance is less than expected. For
example, an unbalanced load on the DXi can cause an overload on some
of the arrays.
Quantum DXi Advanced Reporting Service Manual
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Chapter 1: Advanced Service Reports
Service Report Descriptions
There are various reasons why one disk subsystem might be used more
heavily than others resulting in a bottleneck. Some of these scenarios
include the following:
• Heavy I/O on Metadata because of highly fragmented blockpool at
sites with high deduplication ratios.
• A system ran full and was upgraded. Now, all the WRITES
concentrate on the new array since the existing one is full already.
• At sites with a high deduplication ratio, the above scenario will lead
to an increased READ load on the first (older) arrays since they
contain all the pre-existing data.
The graphs that display on the report can vary depending on the
capacity and the type of DXi system being monitored. On a DXi8500,
the following combined graphs can display to help you monitor disk I/O:
• Disk I/O BlockPool_D
• Disk I/O BlockPool_J
• Disk I/O BlockPool_M
• Disk I/O BulkData_D
• Disk I/O BulkData_J
• Disk I/O BulkData_M
• Disk I/O System
Figure 2 shows a Disk I/O BlockPool_D graph on a DXi8500.
Figure 2 Disk I/O BlockPool_D
Graph
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Quantum DXi Advanced Reporting Service Manual
Chapter 1: Advanced Service Reports
Service Report Descriptions
Note: In the Disk I/O graphs, positive values are reads and negative
values are writes. All values are calculated in Bytes with the
appropriate SI unit (k, M, G, and T). Scalable systems have
different stripe groups depending on their capacity. On a
DXi8500, each of the BulkData_Dn is 4.5 TB in size, so there will
be many of these (size in TB / 4.5) on a bigger system.
On DXi65xx and DXi67xx systems, DXi Advanced Reporting can display
the following combined graphs:
• Disk I/O Data
• Disk I/O Metadata
• Disk I/O SSD
• Disk I/O System2.0.x.
Figure 3 shows a Disk I/O Data graph on a DXi6701.
Figure 3 Disk I/O Data Graph
Disk I/O SG details
Report
The Disk I/O SG details report allows you to monitor disk I/O on a per
stripe group basis. This report is available only to Quantum service
personnel.
Refer to the Disk I/O SG details report graphs in situations where the
overall system performance is less than expected. For example, an
unbalanced load on the DXi can cause an overload on some of the
arrays. There are various reasons why one disk subsystem might be used
more heavily than others resulting in a bottleneck. Some of these
scenarios could include:
• High I/O on metadata because of highly fragmented blockpool and
a high deduplication ratio.
Quantum DXi Advanced Reporting Service Manual
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Chapter 1: Advanced Service Reports
Service Report Descriptions
• A system ran full and was upgraded. Now, all the writes concentrate
on the new array since the existing one is already full. At sites with a
high deduplication ratio, this scenario will lead to an increased read
load on the first (older) arrays since they contain all the pre-existing
data.
The Disk I/O SG details report displays different graphs depending on
the capacity and the type of DXi system. Scalable systems have different
stripe groups depending on their capacity. On a DXi8500, each of the
Disk I/O BulkData_Dn graphs are 4.5 TB in size, so many of these
display (size in TB / 4.5) for a larger system.
On DXi8500 systems, the following output graphs can display:
• Disk I/O BlockPool_D1
• Disk I/O BlockPool_D2
• Disk I/O BlockPool_D3
• Disk I/O BlockPool_D4
• Disk I/O BlockPool_D5
• Disk I/O BlockPool_D6
• Disk I/O BlockPool_D7
• Disk I/O BlockPool_D8
• Disk I/O BlockPool_J
• Disk I/O BlockPool_M
• Disk I/O BulkData_D1
• Disk I/O BulkData_D2
• Disk I/O BulkData_D3
• Disk I/O BulkData_D4
• Disk I/O BulkData_J
• Disk I/O BulkData_M
In general, if operations are functioning correctly, the file system data
disks for the blockpool graphs should all display similar I/O patterns
with little or no I/O as seen in the Disk I/O BlockPool_D1 graph (see
Figure 4).
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Quantum DXi Advanced Reporting Service Manual
Chapter 1: Advanced Service Reports
Service Report Descriptions
Figure 4 Disk I/O BlockPool_D1
Graph
On DXi65xx and DXi67xx systems, the Disk I/O SG details graphs are
slightly different and can display the following graphs:
• Disk I/O A1_SSD
• Disk I/O A2_SSD
• Disk I/O A3_Data
• Disk I/O A4_SSD
• Disk I/O A5_SSD
• Disk I/O A6_SSD
• Disk I/O A7_Data
• Disk I/O A8_Data
• Disk I/O A9_Data
• Disk I/O A10_SSD
• Disk I/O A11_SSD
• Disk I/O A12_SSD
• Disk I/O A13_Data
• Disk I/O A14_Data
• Disk I/O A15_Data
• Disk I/O A16_SSD
• Disk I/O A17_SSD
• Disk I/O A18_SSD
• Disk I/O A19_Data
• Disk I/O A20_Data
• Disk I/O A21_Data
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• Disk I/O Metadata
Figure 5 shows a Disk I/O A9_Data graph on a DXi6701 system.
Figure 5 Disk I/O A9_Data
Graph
Disk I/O Usage Report
This report shows weekly disk I/O usage, including the percentage of
disk usage and peak usage for Data, Metadata, SSD and System.
The report contains the following graphs:
• Disk I/O usage Data
• Disk I/O usage Metadata
• Disk I/O usage SSD
• Disk I/O usage System
Note: The actual graphs displayed depend on your DXi model on
which reports are based. You might not see all of the graphs
mentioned above.
Disk I/O Usage Data
The Disk I/O Usage Data graph (see Figure 6) displays disk I/O statistics
for Data.
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Figure 6 Disk I/O Usage Data
Graph
Use the Disk I/O Usage Data graph to view the percentage of total disk
I/O usage and peak usage for Data.
Disk I/O Usage Metadata
The Disk I/O Usage Metadata graph (see Figure 6) displays .
Figure 7 Disk I/O Usage
Metadata Graph
Use the Disk I/O Usage Metadata graph to view the percentage of total
disk I/O usage and peak usage for Metadata.
Disk I/O Usage SSD
The Disk I/O Usage SSD graph (see Figure 6) displays .
Figure 8 Disk I/O Usage SSD
Graph
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Use the Disk I/O Usage SSD graph to view the percentage of total disk 
I/O usage and peak usage for SSD.
Note: This graph applies only to the DXi 6500/6700 and Fujitsu
libraries with stripe groups called SSD.
Disk I/O Usage System
The Disk I/O Usage System graph (see Figure 6) displays .
Figure 9 Disk I/O Usage System
Graph
Use the Disk I/O Usage System graph to view the percentage of total
disk I/O usage and peak usage for System operations.
Disk I/O SG Usage
Report
This report shows weekly disk I/O usage, including the percentage of
disk usage and peak usage for Data, Metadata, SSD and System for each
stripe group.
The report contains the following graphs:
• Disk I/O usage Data
• Disk I/O usage Metadata
• Disk I/O usage SSD (DXi 6500/6700 only)
Note: If you have multiple stripe groups, a graph displays for Data,
SSD, or Metadata usage for each stripe group. For example, if
you have Data stripe groups called A4 and A7, graphs called
“Disk I/O usage A4 Data” and “Disk I/O usage A7 Data” display
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Disk I/O Usage Data
See Disk I/O Usage Data on page 14.
Disk I/O Usage Metadata
See Disk I/O Usage Metadata on page 15.
Disk I/O Usage SSD
See Disk I/O Usage SSD on page 15.
Full Overview Report
The Full Overview report displays key statistics for a DXi system,
including the amount of data processed by the system, the reduction
ratio, and the levels of I/O activity, CPU usage, etc.
Note: The Full Overview report presents everything that the user
Overview report does, but it also includes statistics on Disk I/O
and CPU.
The report contains the following graphs:
• Data Volume Overview
• Ethernet Activity
• Fibre Channel Activity
• CPU Load Average
• CPU stats in %
• Reduction Ratio
For more information regarding the graphs displayed in the Full
Overview report, see the DXi Advanced Reporting User’s Guide (667353).
Replication Details
Report
The Replication Details report displays information about namespace
and continuous replication activity, including statistics for completion,
queue length, and speed. The report contains the following graphs:
• Namespace Replication % Complete
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• Replication Queue Length
• Namespace Replication Queue Length
• Namespace Replication Speed in Tags/min
• Continuous Replication % Complete
• Continuous Replication Queue Length
• Continuous Replication Speed in Tags/min
Note: In the following examples, some of the data in the Replication
Details graphs may not be accurate.
Namespace Replication % Complete
The Namespace Replication % Complete graph (see Figure 10)
displays completion statistics for namespace replication activities.
Figure 10 Namespace
Replication % Complete Graph
Use the Namespace Replication % Complete graph to monitor how
long namespace replication jobs take to complete.
• The value for Namespace % Complete (teal) rises until it reaches
100% when the namespace replication job is complete.
• A gray background on the graph indicates that a work queue exists
for continuous replication. (Continuous replication is suspended
whenever namespace replication is active.)
• A pink bar at the top of the graph indicates that space reclamation
is in progress. Space reclamation activity is resource intensive and
can affect the rate at which the system deduplicates data or
performs namespace replication.
• A blue bar at the bottom of the graph indicates that namespace
replication was paused by the user.
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• A red bar at the bottom of the graph indicates that a program
pause occurred during namespace replication. A program pause can
occur in the following situations:
• The source or target is not reachable due to network issues.
• The DXi system is in critical space management mode and is
blocking outgoing replication traffic.
A green bar at the bottom of the graph indicates that encryption is
enabled for replication activities.
Replication Queue Length
The Replication Queue Length graph (see Figure 11) displays the size
(in number of tags) of the namespace and continuous replication
queues.
Figure 11 Replication Queue
Length Graph
Use the Replication Queue Length graph to monitor the number of
tags in the queues.
• The namespace replication queue displays above the zero line.
• The continuous replication queue displays below the zero line.
Namespace Replication Queue Length
The Namespace Replication Queue Length graph (see Figure 12)
displays the size (in number of tags) of the namespace replication
queue. Use the Namespace Replication Queue Length graph to
monitor the number of tags in the queue.
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Figure 12 Namespace
Replication Queue Length
Graph
Namespace Replication Speed in Tags/min
The Namespace Replication Speed in Tags/min graphs (see Figure 13
and Figure 14) display the throughput of namespace replication.
Figure 13 Namespace
Replication Speed in Tags/min
(logarithmic) Graph
Figure 14 Namespace
Replication Speed in Tags/min
(linear) Graph
Use the Namespace Replication Speed in Tags/min graphs to monitor
namespace replication performance.
• There are two Namespace Replication Speed in Tags/min graphs.
The first uses a logarithmic scale, and the second uses a linear scale.
Both graphs display the same data.
• The graphs display the rate of namespace replication in the number
of tags replicated per minute (green).
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• The blue line indicates the average rate of namespace replication
over the time range.
Continuous Replication % Complete
The Continuous Replication % Complete graph (see Figure 15)
displays completion statistics for continuous replication activities.
Figure 15 Continuous
Replication % Complete Graph
Use the Continuous Replication % Complete graph to monitor how
long continuous replication jobs take to complete.
• The value for Continuous % Complete (teal) indicates the portion
of the continuous replication queue that has been completed.
Because continuous replication is an ongoing activity, the value may
rise or fall as more data is successfully replicated or is added to the
queue.
A pink bar at the top of the graph indicates that space reclamation is in
progress. Space reclamation activity is resource intensive and can affect
the rate at which the system deduplicates data or performs namespace
replication.
Continuous Replication Queue Length
The Continuous Replication Queue Length graph (see Figure 16)
displays the size (in number of tags) of the continuous replication
queue. Use the Continuous Replication Queue Length graph to
monitor the number of tags in the queue.
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Figure 16 Continuous
Replication Queue Length
Graph
Continuous Replication Speed in Tags/min
The Continuous Replication Speed in Tags/min graphs (see Figure 17
and Figure 18) display the throughput of continuous replication.
Figure 17 Continuous
Replication Speed in Tags/min
(logarithmic) Graph
Figure 18 Continuous
Replication Speed in Tags/min
(linear) Graph
Use the Continuous Replication Speed in Tags/min graphs to monitor
continuous replication performance.
• There are two Continuous Replication Speed in Tags/min graphs.
The first uses a logarithmic scale, and the second uses a linear scale.
Both graphs display the same data.
• The graphs display the rate of continuous replication in the number
of tags replicated per minute (green).
• The blue line indicates the average rate of continuous replication
over the time range.
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Dedupe Details Report
The Dedupe Details report displays key statistics about deduplication
activity, including the amount of data processed by the system and the
levels of I/O activity. The report contains the following graphs:
• Data Volume Overview
• Before Reduction
For more information regarding the graphs displayed in the Dedupe
Details Report, see the DXi Advanced Reporting User’s Guide (667353).
Memory Report
The Memory report is a mapping that displays information about
system memory usage such as free, used (is it used for caching data),
swapped (moved into physical memory from disk and vice versa), etc.
The report contains the following graphs:
• Memory usage
• Swap usage
Note: In the following examples, some of the data in the Memory
graphs may not be accurate.
Memory usage
The Memory usage graph (see Figure 19) monitors the amount of
physical memory (RAM) used during system operation.
Figure 19 Memory usage
Graph
In the Memory usage graph:
• Values are in GB. The graph always displays values in base 1024, no
matter what base is selected in the Base list.
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• For standard memory (4 KB) pages, the graph displays the amount
of memory that is free (green) and used (red)
• For huge memory (2 MB) pages, the graph displays the amount of
memory that is free (light blue) and used (dark blue).
• The graph also displays the amount of memory used for caching
(yellow). Memory used for caching can be easily freed up, therefore
it usually can be treated as available even though it is not free.
Swap usage
The Swap usage graph (see Figure 20) monitors the amount of virtual
memory used during system operation.
Figure 20 Swap usage Graph
In the Swap usage graph:
• Values are in GB. The graph always displays values in base 1024, no
matter what base is selected in the Base list.
• The graph displays the amount of the disk swap file that is free
(light blue) and used (dark blue).
Blockpool Stats Report
The Blockpool Stats report shows the throughput for deduplicated
(blockpool) and non-deduplicated (disk) shares on the DXi. This report
displays only for DXi systems with DXi 2.0 software installed. The report
contains the following graphs:
• Blockpool Volume Overview
• Blockpool Throughput
• Non dedup Throughput
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Blockpool Volume Overview
The Blockpool Volume Overview graph shows the amount of data
written to the blockpool.
Figure 21 Blockpool Volume
Overview Graph
In the Blockpool Volume Overview graph:
Before Reduction (dark blue) shows the amount of data written to the
blockpool. For non-deduplicated data, the graph shows only the Before
Reduction (dark blue) data.
After Reduction (dark green) shows the amount of data that remains
after the ingested data is deduplicated and compressed.
Unique Data (light green) shows the results from deduplication without
compression. The data is larger than “after reduction” but smaller than
“before reduction” if there is any deduplication greater than 1:1.
Blockpool Throughput
The Blockpool Throughput graph shows the rate that data is being
deduplicated by BFST through the following presentation layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
In the following example (see Figure 22), the VTL (light green) variable
shows the amount of data passing into the blockpool through the VTL
presentation layer.
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Note: VTL statistics do not display on DXi systems that do not
support a VTL presentation layer, such as the DXi4500 and
DXi6500.
Figure 22 Blockpool
Throughput Graph
In the Blockpool Throughput graph:
• VTL is not available until DXi version 2.0.1.
• NFS shows the amount of data passing into the blockpool through
the Network File System (NFS) presentation layer.
• SMB shows the amount of data passing into the blockpool through
the CIFS presentation layer.
Non dedup Throughput
The Non dedup Throughput graph shows the rate that data is being
written to non-deduplicating shares through the following presentation
layers:
• Virtual Tape Library (VTL) interface over fibre channel
• NFS over Ethernet from Linux and UNIX backup servers
• SMB/CIFS over Ethernet from Windows backup servers
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Figure 23 Non dedup
Throughput Graph
In the Non dedup Throughput graph:
• VTL is not available until DXi version 2.0.1.
• NFS shows the amount of data passing directly to disk through the
Network File System (NFS) presentation layer.
• SMB shows the amount of data passing directly to disk through the
CIFS presentation layer.
Pcache Stats Report
The Pcache Stats report shows how the paged cache is being utilized in
the DXi system. The paged cache is held in memory where all data is
held before deduplication or restores. Once written to the blockpool,
the data resides on disk. In the case of non-deduplicating shares and
partitions, the data is written to disk without being deduplicated. The
report contains the following graphs:
• Pcache pages
• Pages queued for write
• Unreferenced pages
• Unreferenced dirty pages
• Bytes Open Files
• Bytes Read
• Bytes Written
• Bytes Spilled
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Pcache pages
The Pcache pages graph (see Figure 24) shows how the paged cache is
being utilized.
Note: “Referenced” pages are those that are being read by the
blockpool processes to deduplicate the data. “Unreferenced”
pages are those pages that have data, but aren’t being used by
the blockpool. “Clean” means that the data has also made it to
disk. “Dirty” means the data has not made it to disk.
Figure 24 Pcache Pages Graph
The pcache pages graph contains the following pcache statistics:
DirtyPages (red) are pages in the pcache that contain valid data that
needs to be deduplicated or written to disk for non-dedup shares. These
pages have not been queued for write and are not actively being used.
These pages occur because a protocol client (for example, VTL or NAS)
has not completely filled in a page (it is waiting for more data). These
pages are candidates for being “spilled” if there are not enough
CleanPages and a new page is needed for a read or write operation.
CleanPages (light green) are pages that have made it to disk. The pages
that may or may not contain valid data, but the data does not need to
be deduplicated. These can be pages for which deduplication has
completed, or pages that have been read from BFST, or pages that have
never been used. DXi systems where BFST is able to keep up with ingest
will show mostly clean pages.
FullPages (dark blue) are pages that are ready to be deduplicated. The
referenced full pages are full of data and the protocol clients have sent
them to the Blockpool wrapper (BPW) to be deduplicated. (BPW will
then pass them to BFST, but they are not currently being deduplicated.)
If this statistic starts to increase, it indicates that deduplication is going
slowly enough that BPW is out of threads to start new deduplication
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operations. The number of threads can be adjusted if this turns out to
be useful. (By default the number of threads is 16.)
Note: There are two types of FullPages: “referenced,” which are
asked to be deduplicated by BFST, and “unreferenced,” which
have not yet been asked to be deduplicated by BFST.
PartialPages (light blue) pages that may not be full of data. For
instance, the page at the end of a file will fall into this category. In
general, protocol clients are not expected to request deduplication for
pages that are not full. The system cannot always determine when a
page is full, though. If the system is not sure that the page is full, it is
considered a PartialPage.
TotalPages (black line) represents the size of the pcache on the system.
Each page is 1 MB.
Pages queued for write
The Pages queued for write graph (see Figure 25) shows the FullPages
(dark blue) and PartialPages that are not currently being deduplicated.
If these statistics start to increase, it indicates that deduplication is
going slowly enough that BPW is out of threads to start new
deduplication operations.
Figure 25 Pages Queued for
Write Graph
Unreferenced pages
The Unreferenced pages graph (see Figure 26) shows CleanPages
(light green) and DirtyPages (red) that have data, but are not used by
the blockpool.
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Note: BFST won’t be asked to deduplicate the CleanPages, but at
some point, BFST will be asked to deduplicate the DirtyPages.
Figure 26 Unreferenced Pages
Graph
Unreferenced dirty pages
The Unreferenced dirty pages graph (see Figure 27) shows the pages
in the pcache that contain valid data that needs to be deduplicated.
These pages have not been queued for write and are not actively being
used. This usually indicates a transient state, and the page will
eventually be sent to BFST. Large numbers of these pages indicate that
the backup application may have become inoperative and may ask for a
sync of this data to disk which would cause a spill from pcache to disk.
Figure 27 Unreferenced Dirty
Pages Graph
Bytes Open Files
The Bytes Open Files graph (see Figure 28) displays the total amount of
data actively being written to disk at the request of the backup
application. The BFST continues to use the pcache to deduplicate data,
but will use this data from disk if the pcache becomes unavailable
before the data in pcache is written into the blockpool.
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Figure 28 Bytes Open Files
Graph
Bytes Read
The Bytes Read graph (see Figure 29) shows the amount of data
actually read by BFST from DISK to perform deduplication. Note that a
read should only occur under special circumstances, such as a DXi or
pcache failure.
Figure 29 Bytes Read Graph
Bytes Written
The Bytes Written graph (see Figure 30) shows the total data written to
the commit log by the backup application and the rate of those writes.
The example below shows that the rate of data written to the commit
log by the blockpool increased from approximately 10 T to 12 T.
Figure 30 Bytes Written Graph
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Bytes Spilled
The Bytes Spilled graph (see Figure 31) displays the total data spilled
from pcache and the rate of the spill. This represents all the data that
cannot be processed by the blockpool directly from pcache and must be
written to disk first. The example graph below shows that no data was
spilled from pcache during the selected time frame.
Figure 31 Bytes Spilled Graph
Note: Data spill is data that must be moved from the pcache prior to
being deduplicated.
Self Report
The Self report displays information about the CPU resources used by
the system and by the DXi Advanced Reporting for Service logging
database. The report contains the following graphs:
• CPU Load Average
• CPU stats in %
• Logging Loop Time
CPU Load Average
For more information regarding the CPU Load Average, see the DXi
Advanced Reporting User’s Guide (6-67353).
CPU stats in %
For more information regarding CPU stat in %, see the DXi Advanced
Reporting User’s Guide (6-67353).
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Logging Loop Time
The Logging Loop Time graph (see Figure 32) displays how long it
takes DXi Advanced Reporting for Service to gather performance data
and write it to the logging database.
Figure 32 Logging Loop Time
Graph
Use the Logging Loop Time graph to determine the impact of DXi
Advanced Reporting for Service logging on system performance.
• The graph displays loop times in milliseconds on a logarithmic scale.
• The time to gather data (red) and update the database (blue) is
typically about 2 milliseconds.
• Loop time can increase during periods of high CPU usage.
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Appendix A
DXi Advanced Reporting for
Service Repository
This appendix describes the DXi Advanced Reporting for Service
repository and contains the following sections:
• Repository Overview
• Accessing the Repository
• Uploading Data to the Repository
Repository Overview
The DXi Advanced Reporting for Service repository contains a record of
DXi Advanced Reporting for Service logging data from a large number
of customer DXi-Series systems.
The repository provides a historical reference you can use to diagnose
problems in a customer’s system or to optimize system operation. You
can also use the repository to gain an understanding of how DXi-Series
systems perform in a variety of circumstances.
Logging data can be exported from any DXi-Series system running DXi
Advanced Reporting for Service and then uploaded to the repository.
Once it is uploaded, anyone with access to the repository can view the
logging data for that system.
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Accessing the Repository
Note: The repository is for use by service personnel only. Do not share
the repository with non-service employees or customers.
Caution: Upgrading the software on a DXi-Series system does not
remove the DXi Advanced Reporting for Service logging
database. However, if you reimage a DXi-Series system, the
database and all logged data is lost. Before you reimage a
system, export the logging database and upload it to the
repository
Accessing the Repository
Use the DXi Advanced Reporting for Service Web-based interface to
access the repository and work with logging data.
Follow these steps to access the DXi Advanced Reporting for Service
repository:
1 On the host computer, open the Web browser software.
The host computer must be logged on to the Quantum network.
2 In the Address box, type http://dart.quantum.com and press
<Enter>.
The DXi Advanced Reporting for Service repository window displays
(see Figure 33). The repository lists all DXi-Series systems for which
historical data has been uploaded and is available.
The most recently updated systems appear at the top of the page,
and the remaining systems are listed by serial number.
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Accessing the Repository
Figure 33 DXi Advanced
Reporting for Service
Repository
3 To view logging data for a DXi-Series system, click the system serial
number.
The Overview report window displays for the selected system. Use
the DXi Advanced Reporting for Service Web interface to select
reports and work with graphs. For more information on working in
DXi Advanced Reporting for Service, see the other chapters in this
user’s guide.
Note: In the repository, clicking reset timerange at the top of the
report window displays the entire recorded history for the
system, not just the most recent seven days of logged data.
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Uploading Data to the Repository
Uploading Data to the Repository
This section describes how to add DXi Advanced Reporting for Service
logging data to the repository and contains the following topics:
• Exporting the Logging Database
• Uploading Exported Data to the Repository
Exporting the Logging
Database
Exporting the logging database can be accomplished in either of two
ways.
• Using the DXi Advanced Reporting report window:
1 Click DB Export on the DXi Advanced Reporting toolbar (see
Figure 34).
Figure 34 DB Export button
The DB Export function displays a notification that it is loading
the database (see Figure 35).
Figure 35 Database Loading
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Uploading Data to the Repository
When the DB Export function has completed the database
export, the DB Export Complete dialog box displays (see
Figure 36).
Figure 36 DB Export
Completed
2 Using the information presented in the DB Export Complete
dialog box, upload the data to the repository by following the
steps in the Uploading Exported Data to the Repository
procedure.
• Using an terminal emulation:
1 Using a terminal emulation program that supports SSH (such as
PuTTY) connect to the DXi-Series system.
To connect to the DXi system, use the IP address or host name
of the DXi system as specified on the Network configuration
page. You must enter the root username and password.
Note: The root password is provided by Quantum Advanced
Solutions Product Support (ASPS) and is for internal
use only.
2 At the command prompt, type:
cd /DART
./dbexport
The dbexport command exports the DXi Advanced Reporting
for Service logging database to a zip file (see Figure 37). The file
includes all data in the logging database, from the first entry to
the latest entry.
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Uploading Data to the Repository
Note: When uploading dbexport files to the repository, only
upload the DXiStats-*.tar.gz files and nothing else.
Note that future DXi Advanced Reporting versions
might name the export files differently (such as
ARStats-*.tgz, etc.). To avoid problems, do not rename
or unzip the dbexport files or create subdirectories.
The utility returns the size, name, and location of the exported
zip file. The utility also provides a URL that you can use to easily
download the file from the DXi-Series system.
Figure 37 Exporting the
Logging Database
3 Download a copy of the exported logging database file from the
URL provided in Step 2.
Uploading Exported
Data to the Repository
To upload the exported logging database file to the DXi Advanced
Reporting for Service repository:
Note: Use this procedure only if you are inside the Quantum firewall.
If you are outside the firewall, see the following section,
Uploading to the Repository From Outside the Quantum
Firewall on page 41.
1 Use an FTP program to connect to the following FTP server:
ftp://dart.quantum.com/
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Uploading Data to the Repository
2 Log on to the FTP server with the following information:
Username: statistics
Password: upload
3 Use the put or mput command to upload the exported logging
database file.
The logging data is added to the DXi Advanced Reporting for
Service repository.
Uploading to the Repository From Outside the Quantum
Firewall
If you are outside the Quantum firewall, use the following procedure to
upload the exported logging database file to the DXi Advanced
Reporting for Service repository:
1 Use an FTP program to connect to the following FTP server:
ftp://gps.quantum.com
or
ftp://146.174.253.195/
2 Log on to the FTP server with the following information:
Username: anonymous
Password: <your e‐mail address>
3 On the FTP server, change to the following directory:
/incoming/DART
4 Use the put or mput command to upload the exported logging
database file.
Note: Do not create additional subdirectories. Do not zip or unzip
the logging file. Simply upload the file as it is. Files that
have been altered or that are placed in different directories
are ignored.
The logging data is added to the DXi Advanced Reporting for
Service repository.
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Uploading Data to the Repository
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Glossary
A
Adaptive Deduplication The mode of deduplication which allows
data deduplication to run concurrent with the backup being
ingested. The deduplication process will adapt to the speed of
the ingest.
B
Bit
The basic unit of data in a binary numbering system (binary
digit), represented by a 0 or a 1. Eight bits equals one byte.
Block
During deduplication, data is divided into variable length blocks
(also called blocklets). Redundant blocks are removed and
replaced with pointers to the original copy of the block.
Blockpool See Deduplication Pool.
Byte
C
The basic unit of computer memory which is large enough to
hold one character.
Chargeback A method that provides the functionality to calculate the
storage capacity used by each share in a DXi.
Compress A process of removing fine-grained redundancy from data
prior to storing or transmitting it. The granularity may vary, but
generally compression deals with redundancy in grains of a few
bytes.
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Glossary
Continuous Replication Data replication is the process of creating
and managing duplicate versions of your data. Once a data set
has been deduplicated, it may be replicated (nonredundant
data is transmitted from a source system to a target).
Deduplication tags representing files with a high probability of
being replicated (for example, NAS share marked for replication)
are queued for replication after deduplication is complete
without regard to the replication schedule. This continuous
transmission of data is an optimization allowing replication to
be used with low bandwidth networks.
D
Deduplicate A process of removing coarse-grained redundancy from
data prior to storing or transmitting it. The granularity may vary,
but generally deduplication deals with redundancy in grains of
several kilobytes.
Deduplication Pool The term used to refer to the collection of unique
data stored in a DXi deduplication appliance. The size of the
deduplication pool is reported as the After Reduction statistic
on the DXi GUI and is a measure of the disk space occupied by
all data backed up to the DXi after the data has been
deduplicated and compressed.
Deferred Deduplication The mode of deduplication which begins
only after the deferred deduplication window. Typically,
deferred deduplication begins after the backup ingest is
complete.
Deferred Deduplication Window A defined window during which no
deduplication will take place. This allows maximum system
resources to be devoted to data ingest thus allowing a faster
backup. The deferred deduplication window applies only to the
share/partition for which it is defined. It is possible to define a
second share/partition and perform backups that overlap the
same time period. The data written to the share without a
defined deferred deduplication window will be subjected to
adaptive deduplication.
F
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File or Cartridge Replication File or cartridge replication (FCR)
extends continuous and namespace replication from operating
at a share/partition level and zooms in to the file-directory/
Quantum DXi Advanced Reporting Service Manual
Glossary
virtual cartridge level. FCR can be used to synchronize the
content of a share or partition that is concurrently accessible at
both source and target DXi.
I
Ingest The process of writing data from an external system or
application to disk in a DXi system.
Inline deduplication The removal of redundancies from data before
or as it is being written to a backup device.
L
LUN
N
Namespace The term that applies to metadata required to reconstruct
deduplicated data back into its native application format. It is
used in phrase combinations such as “namespace replication”
or “synchronize the namespace.”
Logical Unit Number. A logical storage unit that corresponds to
a storage volume. A storage array can be partitioned into
multiple LUNs.
Namespace Replication When a replication set is scheduled for
transmission, the system scans the files comprising the
replication set and a namespace file is created. A namespace
file contains the complete set of deduplication tags for the
replication set. Data that is active (a NAS file that is open) or
data that is not yet deduplicated is not included in the
namespace file. The namespace file is then deduplicated and
transmitted to the target system after the data transmission of
the replication set is complete. Once both the replication set
and namespace file have been transmitted to the target
system, the replication can be recovered.
O
NTP
Network Time Protocol. A protocol used to synchronize time
between devices over a network.
OST
OpenStorage (OST) technology
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Glossary
P
Partition A DXi storage destination for data transferred by FC or iSCSI
where the structure is considered to be a virtual tape library
(VTL) and the content is written to virtual tape cartridges.
R
Recover The DXi procedure to make replicated and namespace data
accessible on the DXi to which it had been replicated. If a share
was replicated, then a share is recovered. If a partition is
replicated, then a partition is recovered. It is not possible to
convert a share to a partition (or vice-versa) during the recovery
procedure.
S
Share A DXi storage destination for data transferred by NAS where the
content is treated as files and directories.
Source The term often applied to the DXi that is sending a copy of
deduplicated data to a second DXi.
Space Reclamation A multi phase process used to recover disk space
on a DXi system. During space reclamation, the system searches
for redundant blocks that were not captured during
deduplication. The system also deletes blocks associated with
expired virtual tape cartridges (VTCs) and files that have been
deleted from NAS shares.
T
Tag
A united of ingested data. During deduplication, a tag is divided
into variable length blocks (also called blocklets).
Target The label often applied to the DXi that is receiving a copy of
deduplicated data.
Truncation A process used to recover disk space on a DXi system.
When deduplicated data is truncated, only the metadata is
available on the filesystem. This reduces the amount of capacity
required in the filesystem. Once truncated, the file must be
reconstituted using its tag before you are able to access the file.
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Glossary
V
Virtual Tape Cartridge (VTC) An emulation of a real, physical tape
cartridge, including a type, any nonvolatile memory associated
with the case housing, and that recording medium. Also
referred to as a virtual tape volume or a virtual volume.
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Glossary
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