Hi Cindy

if we're talking a straight VM with standard VHD's then in my experience VMWare HA is generally quicker and less fuss than MSCS!

During my first encounters with ESX back in 2005 i performed a test where i had a user logon to a virtual server i had deployed. I then moved the live VM from one host to another without the user realising what i had done.

However, having said that we had an incident here only yesterday with our SQL Server cluster where the active node public NIC was lost and a failover occurred in the middle of the day, no one noticed (apart from a couple of services that had to be restarted on an application server).

The first question is key, do you really need to go to all the trouble and expense of MSCS, when VMWare HA may do the trick!

Regards

Perry