topic Re: Changing queue depth in StoreVirtual Storage

Changing queue depth

mellowcitizen — Thu, 23 Apr 2009 09:46:07 GMT

I've been observing the performance monitor on a two node VSA cluster. We have several DELL servers with MD1120s and MD1000s attached to Perc6e controllers. Each vsa node is backed by a RAID 50 of 16 146GB 10k SAS disks. My observations lead to the fol1owing question:

A) The queue depth fluctuates but never exceeds 32. Is the queue depth for the VSA capped at 32 and can it be changed?

Re: Changing queue depth

Gauche — Thu, 23 Apr 2009 23:22:21 GMT

The queue depth is not capped by the VSA. The initiator you are using, or OS, might be what is capping it actually. ESX might be capping that, I think you can edit it but I'm not sure, never needed to before.

Re: Changing queue depth

mellowcitizen — Mon, 27 Apr 2009 10:43:07 GMT

Thanks for your response. I've been trying to determine the source of my poor iscsi experience. I thought this was maybe due to the queue depth but further experiments seem to point more to a network limit.
I started another thread with this specific issue, hopefully you can assist.