Storage Service Providers?
Jim Gray
Microsoft Research
Panel Talk at VLDB 2001
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WebDAV
http://www.ics.uci.edu/pub/ietf/webdav/
http://www.webdav.org/
• Web Data Authoring and Versioning
– File Sharing via the Web
– DASL: DAV Searching and Locating
• Basis for Web file sharing apps
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SharePoint™ and other tools
WebDAV redirector in WindowsXP
WebDAV support in Oracle IFS
Products & Free-Ware in MacOS, Linux,…
• But, unit is File (& directory) not Object
– Naming
– Versioning
– Security
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x Business Models:
x: xSP
• ISP: Thin client-fat server
– Presentation at client (browser)
– application at server
• ASP: fat-client fat server
– Presentation, context management at client
– Business logic and data at server
• SSP: fat client thin server
– Presentation, business logic, and DBMS at client
– File or Disk Blocks at server
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iSCSI SSP?
• The SAN story on the Internet?
– Client does file management
– File does disk space management
– Client does security
– Client does…..
• SAN:
– not a good idea in a LAN
– Terrible security, naming, performance in a WAN
• Not likely
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File SSP
• NAS Story on the Internet
– What many are doing.
– Scale8, Others
– Disaster backup
– Archival storage
• A good business for WORN data
Write-Once Read Never
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WORN Business Plan
Internet NAS: 9,000% profit margins
• Rich customers buy storage
for 1,000$/GB from 3-letter companies.
• Poor / shrewd companies buy storage
for 10$/GB from no-name companies.
• Same disks in both boxes!!!
• Can receive data over Internet for 1$/GB.
• Profit = 1,000$-11$ = 989$. a chance
8,990%profit
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Management Cost: 8$/MB/Y ???
(== 8 B$ / PB / Y)
• Lets see:
– 1 Exabyte of disk shipped last year == 1012 MB
– So storage management cost (for last years’ disks):
8 Trillion $/y == 10 % of world GNP?
– Probably not.
– My guess <80B$ (including DBMS)
=< 8 cents/MB/Y.
(total software + labor + DBMS tax).
< 3x disk vendor revenue.
• 8$/MB/y seems to be a rumor
started by the 1$/MB storage vendors.
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Free Advice x = W
• Become a WSP (web service provider)
if you are service oriented.
• Not 9,000% profit, but…
– It’s the right place to put the architectural line.
• Includes being a WebDAV SP.
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