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cachestats
2008 Feb 19
1
ZFS and small block random I/O
...ips for
optimizing small block random I/O on ZFS, or any other documents that
might explain what we''re seeing and give us guidance on how to most
effectively deploy ZFS in an environment with heavy small block random
I/O.
The first anomaly, Brendan Gregg''s CacheKit Perl script fcachestat shows
the segmap cache is hardly used (occasionally during the IOzone random
read benchmark, while the disks are grabbing 20MB/s in aggregate, the
segmap cache gets 100% hits for 1-3 attempts *every 10 seconds*--while
all other samples are zero% for zero attempts. I don''t know the kernel...