Aswarvar, With the MD3220 being a SAS enclosure it was not meant for this type of operation. With the SAS arrays being a direct connect enclosure there is no kind of real multipathing. For what you are trying to do you would want the iSCSI or Fiber arrays. With the way VMWare sees the SAS enclosure, it thinks it is a form of local storage. Being that it will see it as a form local storage you will not be able to do any kind of vMotion with ESXi. I did find a pdf article from vmware regarding clustering that may assist a little with what you want to do but just keep in mind iSCSI and Fiber is what is recommended with what you want to do. pubs.vmware.com/.../vsphere-esxi-vcenter-server-50-mscs-guide.pdf   I hope this answers some of the questions that you have. Feel free  to let me know if you have any other questions and I would be happy to assist.
Spent some time on google as well as "tinkering" to see if I could get this to work and haven't had much luck.  First, my configuration: (2) Dell PowerEdge R610 servers (1) MD3220 w/2 controllers each R610 has redundant connections to the MD3220.  Port 0 on controllers 0 & 1 connected to R610 #1 and port 1 on controllers 0 & 1 connected to R610 #2 I am running ESXi 5 on each R610 Each R610 has (2) VM's stored locally - Windows Server 2008 Enterprise x64 and Windows Server 2008 Standard x86. What I want to do is give the 2008 Enterprise x64 VM access to a pair of virtual disks on the MD3220 so that I can cluster the 2008 Enterprise x64 VM's.  Can this be done?  Essentially I am NOT going to store the VM's on the array, they will be stored on the R610's.  I want to cluster a database using the array instead. Our existing architecture is to just install 2008 x64 on each R610 and cluster them.  What I want to try and achieve with virtualizing is to try and reduce our deployment time (we build a LOT of clusters for clients that buy our automation systems), and also store a copy of the VM's on yet another virtual disk on the array.  I am hopeful this could be used as somewhat of a quick way to recover from a disaster (just copy the VM back to the local R610, perform some configuration, and be up and running again), and to take advantage of the snapshot features with ESXi. Is what I want to do possible with the 3220 or is this something I would need to try with the 3220i?
MD3220 access to virtual machines - possible?