>>>>> "pr" == Peter Radig <pe...@radig.de> writes: >>>>> "ls" == Lutz Schumann <presa...@storageconcepts.de> writes:
pr> I was expecting a good performance from the X25-E, but was
pr> really suprised that it is that good (only 1.7 times slower
pr> than it takes with ZIL completely disabled). So I will use the
pr> X25-E as ZIL device on my box and will not consider disabling
pr> ZIL at all to improve NFS performance.
According to Lutz posting here ~2010-01-10, the X25-M may not actually
be functioning as a ZIL unless you disable its write cache with
'hdadm'. He said he found normal hard drives respect cache flush
commands in stream, but Intel X25-M does not. however both do respect
disabling the write cache.
ls> r...@nexenta:/volumes# hdadm write_cache off c3t5
ls> c3t5 write_cache> disabled
You might want to repeat his test with X25-E. If the X25-E is also
dropping cache flush commands (it might!), you may be, compared to
disabling the ZIL, slowing down your pool for no reason, and making it
more fragile as well since an exported pool with a dead ZIL cannot be
imported.
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