+1 to vlun perf and sorting by VVs, Max 16 and select peak as total_svctms then total_iops, the total_kbps. You should see the offenders and offendees pretty clearly if it a VV util issue.
Also if you have a physical disk breaking bad you can see an overall increase in performance time. Usually it will predicative fail before you see to much latency, but not always.
Use the PDperf SR graph, compare PDID, Max 16 and select peak as total_svctms
If a wonky disk is the case you will tell pretty quickly as a disk will be noticeably out of lock step of the others. You can then work with support to servicemag the offender out and replace, or do it yourself if that is how you roll.
_________________ Bryan W Senior Architect/Manager of System Infrastructure, Dallas TX https://www.linkedin.com/in/bryanlwhite
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