Since it's a linux domU I would expect to see caching in the domU iirc
ext3 (or whatever) is a heavily caching fs.
Stu
Mark Johnson wrote:
Gary Pennington wrote:
Some answers below...
The above command returns under 2.5 seconds, however iostat on domU AND
zpool iostat on dom0, both continue to show write IO activity for
upto 30 to
40 seconds:
If the domU is showing IO activity, then it must be caching too.
When you write the data to the zvol most of the writes are cached
to memory and the writes to disk are performed later when ZFS writes
the memory cache to disk. It seems that your logging device is capable
of writing about 40MB/s (see your figure below), so it takes at least
800/20
seconds to write this to disk.
you can to do a iostat -x 1 and see the stats for
slog device.
MRJ
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