LAN / WAN
Business Proposal
What is a LAN or WAN?
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A LAN is a Local Area Network it usually
connects all computers in one building or
several building within close proximity. Sharing
files and folders, virtually as one computer.
A WAN is a Wide Area Network that connects
computer across a metropolitan area or a
collection of several LANs across the world.
Why should have a network?
Network security is a major concern for all
companies.
By having a network you are then operating
on an Intranet. (An internal private
network, only accessible by its internal
users with an Internet backbone. )
Allowing for higher security of company
data.
Benefits vs Restrictions
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Higher security
Less down time
24 hour 7days a week
onsite service.
Higher productivity
Centralized
Administration
More reliable work
stations
Backup and Data storage
on server
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No more random
downloads (restricted
sites)
Shared bandwidth (all
data packets in and out
will be scanned for
viruses)
Authorized users (create
user permissions)
Disk Fault Tolerance…..
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Fault tolerance is the ability of a computer to respond to
catastrophic events with no data being lost or corrupted.
Fully fault-tolerant systems using fault tolerant disk
arrays prevent the loss of data.
Disk fault tolerance is not an alternative to a back up
strategy with off-site storage.
RAID provides fault tolerance by using data redundancy.
Writing data to more than one disk, for security in the
event of a single hard drive failure.
Redundant Array of Independent Disks,
a.k.a. Redundant Array of Inexpensive Disks; is a
standardization of fault tolerance options in five
levels. The levels offer various combinations of
performance, reliability and costs. RAID can
save you time and money because you lose
access to data while replacing the hard drive
and uploading data.
Types of RAID….
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RAID can be implemented as either a software
or hardware solution
RAID 1 mirrored volumes or RAID 5 volumes
using Stripped volumes with parity are the
software solutions.
With software versions there is no fault tolerance
following a failure until the fault is repaired. If a
second fault occurs before the data lost from the
first fault is regenerated, you can recover the
data only by restoring it from a backup.
Mirrored Volumes (RAID 1)
RAID Hardware Solutions
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Hardware fault tolerance is more expensive than
software fault tolerance
Hardware fault tolerance solutions might use hot
swapping of hard disks to allow for replacement
of a failed hard disk without shutting down the
computer and hot sparing so that a failed disk is
automatically replaced by an online spare
Windows operating system has RAID softwarelevel restrictions that do not apply to RAID
hardware-level configurations
RAID 5
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Parity is a mathematical method of determining
the number of odd and even bits in a number or
series of numbers. This can also be used to
reconstruct data if one number in a sequence of
numbers is lost.
If a single disk fails, Windows can use the data
and parity information on the remaining disk to
reconstruct the data that was on the failed disk.
RAID 5 Parity Data Stripes
RAID 5
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RAID 5 uses stripped volumes w/ parity
RAID 5 has a cost advantage over mirrored
volumes because disk usage is optimized. The
more disk you have in a RAID 5 volume, the less
the cost of the redundant stripe
There are some restrictions that RAID-5
volumes implement in software. First, RAID-5
volumes involve a minimum of three drives and
a maximum of 32 drives. Second, a softwarelevel RAID-5 volume cannot contain the boot or
system partition
The following table shows how the amount of
space required for the data stripe decreases
with the addition of 2-gigabyte (GB) disks to the
RAID-5 volume:
Number of
disks
Disk space
used
Available disk
space
Redunda
ncy
3
6 GB
4 GB
33
percent
4
8 GB
6 GB
25
percent
5
10 GB
8 GB
20
percent
Mirrored volumes Striped volumes with parity
RAID 1
RAID 5
Supports FAT and
NTFS
Supports FAT and NTFS
Can protect system or
boot partition
Cannot protect system or boot partition
Requires 2 hard disks
Requires a minimum of 3 hard disks and allows a
maximum of 32 hard disks
Has a higher cost per
megabyte
Has a lower cost per megabyte
50 percent utilization
33 percent minimum utilization
Has good write
performance
Has moderate write performance
Has good read
performance
Has excellent read performance
Uses less system
memory
Requires more system memory
How is this done?
The software-level fault tolerance features of
Windows Server are available only on
Windows dynamic disks. In Windows
Server, you create software-level mirrored
and RAID-5 volumes by using the Create
Volume wizard in the Computer
Management snap-in.
Data Backup and Storage
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Files You can store the files on a removable media
device, such as an Iomega Zip drive, or on a network
location, such as a file server. The file created contains
the files and folders you have selected to backup. The
file has a .bkf extension. Users can back up their
personal data to a network server.
Tape A less expensive medium than other removable
media, a tape is more convenient for large backup jobs
because of its high storage capacity. However, tapes
have a limited life and can deteriorate. Be sure to check
the tape manufacturer's recommendations for usage.
Planning When to Backup
You should plan your backup jobs to fit the needs
of your company. The primary goal of backing up
data is to be able to restore it if necessary, so
any backup plan you develop should include
how to restore data. You should be able to
quickly and successfully restore critical lost data.
There is no single correct backup plan for all
networks.
Determine What to Back Up
Always back up critical files and folders that
your company needs to operate, such as
sales and financial records, the registry for
each server, and the Active Directory store
.
Determine How Often to Back Up
If data is critical for company operations,
back it up daily. If users create or modify
reports once a week, backing up the
reports weekly is sufficient. You need to
back up data only as often as it changes.
For example, there is no need to do daily
backups on files that rarely change, such
as monthly reports
Perform Network or Local Backup
Jobs
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A network backup can contain data from multiple
network computers. This allows you to
consolidate backup data from multiple
computers to a single removable backup media.
A network backup also allows one administrator
to back up the entire network. Whether you
perform a network or local backup job depends
on the data that must be backed up. For
example, you can back up the registry and the
Active Directory store only at the computer from
which you are performing the backup.
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If you decide to perform local backups, they
must be performed at each computer, including
servers and client computers. There are several
things to consider in performing local backups.
First you must move from computer to computer
so that you can perform a backup at each
computer, or you must rely on users to back up
their own computers. Typically most users fail to
back up their data on a regular basis. A second
consideration with local backups is the number
of removable storage media devices available. If
you use removable storage media devices, such
as tape drives, you must have one for each
computer, or you must move the tape drive from
computer to computer so that you can perform a
local backup on each computer.
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You can also choose to use a combination
of network and local backup jobs. Do this
when critical data resides on client
computers and servers and you do not
have a removable storage media device
for each computer. In this situation, users
perform a local backup and store their
backup files on a server. You then back up
the server.
Recommended..
I recommend a tape backup unit and tape
backup software with a pack of tape
media.
 Backups can be scheduled twice a week
or as needed.
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Costs of the Installation
Labor=$55 per/hour 8hrs/day = $440 day
 3 days = $1320
 4 days =$1760
 Excluding the cost of the server hardware,
software, and cost of wiring tech
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Network Options…..
Dell Servers
 HP Servers
 Customized McCoy Tech Servers
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