view storage iops and uplink sizing

[mthiha]

Hi ,

Need help on IOPS and UPlink throughput using iSCSI.

requirements:

12 IOPs per win7 VM (assume)

100 concurrent users

3 ESXi

on average need ~1200 IOPs excluding view servers.

Using Raid5, how do i calculate storage uplinks MBps requirements from this IOPs?

Assume using mid range storage, 2SPs, If i aggregate 4x1G uplinks per processor together, that will give me 4G throughput per processor.

Will it be enough for this IOPs or Do i need 10G iSCSI module on storage?

what is the standard size of IOPs used in win7 VM?

[robdevaul]

I'm trying to figure this stuff out at the moment as well.  The VMware document: http://www.vmware.com/files/pdf/view_storage_considerations.pdf mentions that the RAID5 causes 4 IOPS per write and estimates that 60% of the IOPS is writing.  That would mean you are dealing with ~3360 IOPS.