you may select a specific object that you want to check, such as LUN, disk, SP, RAID Group, etc. Then to choose any counters you want, like read size, write size, throughput, Utilization, etc.  To determine the I/O patten, you should check lun object, choose read or write size to determine the I/O size. But for random or sequential, there is no such a counter could tell us directly. You need to check counters like "SP Cache Read/Write Hits/Ratio", "Disk Crossings(%)", etc, but again, it won't be easy to determine. Basically, you should understand your application behaviour to have a general view of the possible I/O patten. Like OLTP is usually for "small, random 70% read with 30% Write".  -Steve
Hello all,  After reading the document "EMC Clariion Best Practices for Performance and Availability" and merge 7 days worth of Analyzer data, I have question that I would like to ask you guys for help.  How can I identify the I/O type on a specific LUN, RAID Group and/or Storage Pool?  In other words,  How can I know if the data read/written to my array is random or sequential?, the block size?  Thank you very much!
CX4 Perfomance