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Pinned topic I/O governing and cache mode

‏2012-03-02T21:55:48Z |
we are an IBM shop running a 6 node svc cluster with ds8300s as the back end controllers.
almost 40% of our entire space is flash copy targets.
looking at the performance stats from TPC I notice that some mdiskgrps are running more than 1200 IOPS /mdisk (1mdisk = 1rank).

going thru performance guide I saw IO governing feature and cache disabling for vdisks
so, my question is did any one used this IO governing or disabled cache on the vdisks and can I try this on flashcopy targets will that buy me anything at all.

any feed back is greatly appreciated thanks!