We have 2 ESX 2.5.2 servers, 1 production & 1 developement, and one the developement server we have serveral MS clustered VM's on the same physical box. I've read that clustering between ESX servers won't carry over when you do an upgrade to VI3, but will VM's MS clustered on the same box have issues as well?
The shared disks are on an EMC CX300 SAN that is formatted in VMFS with the ESX server in a storage group using RAID-5 disks. The SCSI controller is set to virtual and the disks are in persistent mode. Let me know if you need any other information I haven't provided.