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Bad results on sqliosim utility with EMC CX4

Posted By:      Posted Date: September 16, 2010    Points: 0   Category :Sql Server
We were using our sqliosim utility to load test our luns on the san.    And strangely in our results our average i/o msec = 0 with 4 cpus or less , but with 8 cpus (which is what our servers have (2 cpus with quad core),  we get 50-100 msec on the luns.  Now our luns have more than 20 spindles on emc cx4.    When we lower the cpus on the test, the results are accpetable under 10 ms or less -- for most part 0 msec for the data luns.   Once the cpu is 8  then we get warnings on the luns about atleat one i/o is waiting for over 15 msecs.    Now based on the article below, the results are not acceptable.  Anyone can clarify this?http://sqlblog.com/blogs/kevin_kline/archive/2007/06/28/understanding-sqliosim-output.aspxhttp://support.microsoft.com/kb/231619So is it really necessary that the Running Average IO Durataion msec be below 10 under all circumstances?   From the article it seems so. We get results were it is 50 msec or above with 8 cpus config setting (which is unacceptable ) in the article.   However again, all is well with 4 cpus or below

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