Check the QOS settings on the switches. They should be set to give maximum priority to the iSCSI traffic. Some switches have a "lossless" setting that provides the most buffering for your packets. Also check the frame size, and make sure it matches from end to end. That is, if any device in the chain from VM guest to VM vswitch to HP switch to Dell Equallogic array is set to use Jumbo frames, they should all be. Another thing to look at is to make sure your auto negotiation settings match, as in all auto, or all manually configured to the same speed/duplex settings.
-----Original Message----- From: Matthew W. Ross [mailto:mr...@ephrataschools.org] Sent: Friday, November 16, 2012 11:49 AM To: NT System Admin Issues Subject: iSCSI with HP/Brocade switches Hey List. I have our new Dell/Equalogic vSphere cluster up and running, but we have been having some issues as of late with latency on switch side of the equation. When we set up the cluster, we decided to use a pair of HP 2910al-24G switches. These were not the switches recommended by our VMWare vendor (They recommended a pair of Brocade 6610 switches). Now that we have been having these latency issues, we are considering the recommended switches. So here's my questions: 1) Has anybody used HP switches (2910al-24s or similar) as the iSCSI transport? Has anyone seen similar issues, or are there some specific configurations that need to be double-checked? 2) Anybody seen any issues with the Brocade switches? (I expect the answer to be "no", but it's never too late/early to ask.) --Matt Ross Ephrata School District ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin
