Problems with several PVSCSI cards per vm?

Hi all - I have a Windows 2008 R2 SQL Server and 3 volumes... 30, 50 GB and 300 GB. I have a separated from PVSCSI adapter bound to each volume. Is this acceptable or favorite? I'm using iSCSI if that's important.

The reason why I ask, I see latency on long-running queries to my web server to my volume (300 GB) database.

Is it possible that 3 controllers PVSCSI is exaggerated? I am gaining anyhting with 3?

Thoughts and comments or suggestions would be greatly appreciated.

What weight are SQL workloads?  PVSCSI driver is actually worse than the regular driver LSI under low I/O workloads.  Read the blog post following by Scott Drummonds (VMware performance guru), as well as this VMware KB on the same subject:

http://vpivot.com/2010/02/04/pvscsi-and-low-IO-workloads/

http://KB.VMware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalID=1017652

In addition, I don't see really any advantage to have several cards PVSCSI by VM, unless you exceed the virtual SCSI devices per SCSI card number. If anything it complicates things a bit and won't give you the performance gains.

Tags: VMware

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