Hello, 
  I'm curious if anyone would mind sharing their experiences with zvol's.  I 
recently started using zvol as an iSCSI backend and was supprised by the 
performance I was getting.  Further testing revealed that it wasn't an iSCSI 
performance issue but a zvol issue.  Testing on a SATA disk locally, I get 
these numbers (sequentual write):

UFS: 38MB/s
ZFS: 38MB/s
Zvol UFS: 6MB/s
Zvol Raw: ~6MB/s

ZFS is nice and fast but Zvol performance just drops off a cliff.  Suggestion 
or observations by others using zvol would be extremely helpful.   

My current testing is being done using a debug build of B44 (NV 6/10/06).

benr.
 
 
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