Also, important is making sure the vm's have their DISK timeout value set to 60 seconds.  On the EQL support website, under the 5.2.2 firmware upgrade link, is a document "OS Consideration" guide" that covers how to change that value in the VM OS itself.   The Disk timeout value of ESX(i) is already set.  (Not to be confused with the LOGIN timeout value that Joe was referring to)   There are some applications like Exchange and SQL which can produce errors during the controller restart.  Since they have an internal timer that may report latency warnings during that time.  When possible, doing an upgrade to during a maint window or slow IO activity is a good idea.  Regards, 
hi there, I need to upgrade the firmware on 3 equallogics from 5.02 to 5.2.2. I plan to do this via an interim upgrade to 5.1.2 I was wondering if you think its necessary to shutdown and servers (VMs) running off the SAN when the firmware is upgraded? Thanks, Huw
Quick Q on upgrading firmware