We are in the process of virtualizing our Windows servers and have been using PerfMon to obtain current disk I/O stats. The goal is to build the appropriate arrays on the SAN which would best suit the workload. Currently, all of the physical servers have a local RAID5 array. The servers also have BBW cache. Example Physical Server Stat: (Other servers are higher) (8 hours) Average Read/Sec: 12.77 Average Write/Sec: 4.9 Avg Write Queue Length: .012 Avg Read Queue Length: .001 So, how would we interpret the results of PerfMon running against a current RAID5 set to help us in our planning? Would we need to "uncalculate" the current RAID penalty to get raw potential I/O of the server / applications? Many thanks in advance for any assistance.
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