Patrick wrote:
I'd take a look at which VM's are generating the most I/O then move them over to a separate SSD/10K CPG. If you have any workloads with a heavy write pattern you could also try separate CPG for that with Raid1 on the 7k tier.
Also make sure your block sizes within the guest os are correct for the workload, i've seen a couple places forget to use 64k blocks for SQL and video storage causing orders of magnitude more unnecessary IO.
Thank you for the input Patrick, for one application related LUN I can see write request is more as you mentioned.