Contract SFS-DEV-001 early draft: Difference between revisions
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SFS-DEV-001 includes three areas for development. These areas are listed below with highlighted results. | SFS-DEV-001 includes three areas for development. These areas are listed below with highlighted results. | ||
== Lustre FSCK: OI Scrub == | == Lustre FSCK: OI Scrub == | ||
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OI Scrub project provides ground work for a complete Lustre FSCK tool. Crucial to success of this tool is performance. OI Scrub has been demonstrated checking over 100K files/second on a typical MDS hardware node. In addition, OI Scrub provides a on-line mode that has been shown to add negligible system load with limited scan rates: | OI Scrub project provides ground work for a complete Lustre FSCK tool. Crucial to success of this tool is performance. OI Scrub has been demonstrated checking over 100K files/second on a typical MDS hardware node. In addition, OI Scrub provides a on-line mode that has been shown to add negligible system load with limited scan rates: | ||
[[File:on-line-impact-oiscrub.png| | [[File:on-line-impact-oiscrub.png|frameless|300px|OI Scrub provides on-line scanning for corruption. A successful online tool should not impact system performance. This figure show the fall-off in performance from a system without OI Scrub running in the background (0 on the x-axis) through to a system with OI Scrub running as fast as possible (-1 on the x-axis.) The results from this graph indicate that negligible performance impact will be observed while running OI Scrub with Kfiles per second limited between zero and five.]] | ||
== Single Server Metadata Performance: Parallel Directory Operations == | |||
=== Key Message === | |||
* Only a single lock is available for a directory on Lustre. | |||
* Clients wanting access to a file in the same directory must do so in serial. | |||
* This is fixed in | |||
=== Recent Results | |||
[http://wiki.whamcloud.com/display/opensfs/OpenSFS+Lustre+Development Whamcloud site] for more information. | [http://wiki.whamcloud.com/display/opensfs/OpenSFS+Lustre+Development Whamcloud site] for more information. | ||
Revision as of 12:31, 5 December 2012
SFS-DEV-001 includes three areas for development. These areas are listed below with highlighted results.
Lustre FSCK: OI Scrub
Key Message
- Enable file-level backup and restoration of an MDT.
- Core infrastructure for online consistency checking.
Details of the internal of this work is available at on the Whamcloud community wiki.
Recent results
OI Scrub project provides ground work for a complete Lustre FSCK tool. Crucial to success of this tool is performance. OI Scrub has been demonstrated checking over 100K files/second on a typical MDS hardware node. In addition, OI Scrub provides a on-line mode that has been shown to add negligible system load with limited scan rates:
Single Server Metadata Performance: Parallel Directory Operations
Key Message
- Only a single lock is available for a directory on Lustre.
- Clients wanting access to a file in the same directory must do so in serial.
- This is fixed in
=== Recent Results
Whamcloud site for more information.