If you're considering getting a cache adapter I'd hold off on messing with the RAID config until afterwards - tuning for writes is different than tuning for IO in general since you're looking for free space and generally the more contiguous the better.

Have you done a reallocate measurement, are your VMDK files all aligned?

On 09/25/2012 04:19 AM, Steffen Knauf wrote:

Hello,

i'll try to improve our I/0 Perfomance. We have a raidgroup with 16 disks (SAS), 1 aggregate and 1 volume (dedup enabled). The volume is the storage for 100 VM's on the VMware Cluser (access via NFS). Does it make sense to increase the raidgroup? 90% Percent of the Disk I/O are Read Ops, so i'll buy a PAM Card for our FAS3240,too.

And what's your Experience with the Raidgroupsize of a Raidgroup with SATA Disks (now: 11+1)?

Thanks and greets !

Steffen
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