Gary Mills wrote:
On Thu, Jun 18, 2009 at 12:12:16PM +0200, Cor Beumer - Storage Solution
Architect wrote:
What they noticed on the the X4500 systems, that when the zpool became
filled up for about 50-60% the performance of the system
did drop enormously.
They do claim this has to do with the fragmentation of the ZFS
filesystem. So we did try over there putting an S7410 system in with
about the same config on disks, 44x 1TB SATA BUT 4x 18GB WriteZilla (in
a stripe) we were able to get much and much more i/o's from the system
the the comparable X4500, however they did put it in production for a
couple of weeks, and as soon as the ZFS filesystem did come in the range
of about 50-60% filling the did see the same problem.
We had a similar problem with a T2000 and 2 TB of ZFS storage. Once
the usage reached 1 TB, the write performance dropped considerably and
the CPU consumption increased. Our problem was indirectly a result of
fragmentation, but it was solved by a ZFS patch. I understand that
this patch, which fixes a whole bunch of ZFS bugs, should be released
soon. I wonder if this was your problem.
George would probably have the latest info, but there were a number of
things which circled around the notorious "Stop looking and start ganging"
bug report,
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6596237
-- richard
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