Legacy HDS Forums

Tuning Manager Response Time

Discussion created by Legacy HDS Forums on Mar 21, 2013
Latest reply on Oct 11, 2013 by saintly guy

Originally posted by: silverspirit

I asking myself what the Response Rate given in Tuning Manager Reports per LUN exactly mean.
If I look to a report description it is stated:
Write Response Rate
Average processing time for each write operation request (in micro seconds)

Is this the time a write operation is performed by a server into the Storage Array Cache ? (I assume destaching to disk is done at a later time).
If so, I don't understand why for LUNs were many IOPs are performed eg. 1000, the write response is at 0.1 milli seconds, whereas for low utilized LUNs eg. 5 IOPs, the response time is egual or higher than 20 ms.