Great Thanks to Sudheer Apte for providing the following response: (this is one of the tools our customer will use to capture the I/O statistics):
This is the “vscsistats” tool I was mentioning. Shipped with VMWare ESX, it measures I/O statistics (I/O size, number, latency distributions) on a per-virtual disk level.
The above article also has a link to the full paper by the developers.
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Great Thanks to Vipul Jain for providing an Oracle AWR report for 2500 user workload, which closely resembled out environment and the DELL benchmarking document: 121188 for ITSM 7.6. This was a great help and provided the baseline IOPS I was looking for - Thanks Vipul!