On Jun 8, 2010, at 1:33 PM, besson3c <j...@netmusician.org> wrote:
Sure! The pool consists of 6 SATA drives configured as RAID-Z. There
are no special read or write cache drives. This pool is shared to
several VMs via NFS, these VMs manage email, web, and a Quickbooks
server running on FreeBSD, Linux, and Windows.
Ok, well RAIDZ is going to be a problem here. Because each record is
spread across the whole pool (each read/write will hit all drives in
the pool) which has the side effect of making the total number of IOPS
equal to the total number of IOPS of the slowest drive in the pool.
Since these are SATA let's say the total number of IOPS will be 80
which is not good enough for what is a mostly random workload.
If it were a 6 drive pool of mirrors then it would be able to handle
240 IOPS write and up to 480 IOPS read (can read from either side of
mirror).
I would probably rethink the setup.
ZIL wil not buy you much here and if your VM software is like VMware
then each write over NFS will be marked FSYNC which will force the
lack of IOPS to the surface.
-Ross
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