All, we are in the process of planning our storage utilization on a VNXe connected to VMware 4.1 (maybe VMware 5). We are going to follow best practice by EMC and create a RAID5 for general use data and a RAID1/0 for the high performance items such as SQL and Exchange.
My question, when planning which datastores to use on my VMs should I put all of Exchange on the high performance or split them up? For example, my Exchange environment I have an OS disk and a DATA disk. Can I put the OS VMDK file on the RAID 5 and the Exchange DB/LOGS on the RAID1/0? I'm thinking I need to keep everything on the RAID1/0 because the OS will process the data and if the RAID5 is the bottleneck then having the RAID1/0 wouldn't do any good (performance wise). Same question for my SQL servers.