Solaris ZFS & Cyrus : BugID 6535160
Pascal.Gienger at uni-konstanz.de
Fri Dec 14 00:20:33 EST 2007
Vincent Fox <vbfox at ucdavis.edu> wrote:
> With ZFS there are a number of hits with fdsync bugids. This connects
> back to I believe Pascal Giengers' thread, which I think resulted in him
> turning off ZIL to bump up performance. This is speculation at this
> point, anyhow here's the BugID information for those what's interested:
I did not turn off ZIL because I did not want to bump my head out...
Turning off ZIL is not a very good idea. You see, every file system can be
tuned to be fast turning off all what does guarantee its consistency.
Nevertheless I did not want to have a fast mail storage which is completely
The zil lock problem appeared once but disappeared completely like a
I have reasonable figures now on our servers doing reconfiguration on the
storage side, it appeared to be a random i/o problem on storage, and Cyrus
is _HEAVY_ random i/o. Not huge data rates but huge seek rates.
You can give your storage system some hints, writes do appear in ZFS as
sequential ones. Blocks are written in a sequential way (due to COW), but
are read in a random way (for sure).
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