I am running a PS4000XV in an VMware vSphere 4 environment. I do have multi pathing setup and configured as per Dells recommendations. I have a question related to performance, I know I can have up to around 10 VM's in VMFS datastore however, this really does limit the number of paths I have to SAN. I have 3 NIC's dedicated to multipathing so if I have two LUNs setup on the iSCSI SAN I have a total of 6 paths for active IO to the SAN.
Should I use a LUN for every 2 VM's for instance? Or should I use just one big lun? WHat are you thoughts on this and will using more LUNs give me more paths therefore greater potential for performance gains during heavy IO.
If I use 1 big lun
Total Paths: 3 per ESX Host
Total Paths: 12 per ESX Host.