Drew,

I am also curious what version of DSS you are running?

Were you experiencing any iSCSI timeout errors when using ESX 3.5?

What RAID level are you running on your DSS SAN?

We had fought iSCSI timeout issues with DSS for many months. I tried configuring the DSS SAN with all of the recommended perfomance settings as specified by Open-e support. Things got a little better, but when the SAN was under moderate to heavy load we would still get CMD Abort and Task Not Found errors. What I found to be our ultimate solution was to rebuild our RAID set as RAID 10. Previously I was using RAID 5 and had my VMs split accross 2 DSS SANs, so each was had 50% of the ESX load. Now with the SANs at RAID 10, I am able to run ALL of my VMs on 1 SAN with better performance and NO iSCSI timeouts or errors, under any load.