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2010 Aug 24
7
SCSI write retry errors on ZIL SSD drives...
...#39;s and the ascv_t times seem reasonably low and don''t indicate a bad
drive to my eyes...
The timeouts above exact a rather large performance penalty on the
system, both in IO and general usage from an SSH console. Obvious
pauses and glitches when accessing the filesystem.
The problem _follows_ the ZIL and isn''t tied to hardware. IOW, if I
switch to using the L2ARC drives as ZIL, those drives suddenly exhibit
the timeout problems...
If we connect the SSD drives directly to the LSI controller instead of
hanging off the hot-swap backplane, the timeouts go away.
If we use SSD'...