The numbers your are talking about (150 IOPS) is not a maximum, it is a recommended sustained maximum. This means you should plan to never exceed this number for any extended period of time.

The drives themselves can burst to much higher rates, but it can have a serious impact on your performance if you rely on it.

I've seen 146GB 15k drive sustain 300+ IOPS for minutes at a time, but once we found it we redesigned the disk layout to prevent it happening again.

Hi. Thanks for the feedback. How does this correlate to Utilization, which was only 40%.

Thanks.

I'll have to defer to one of the performance experts from EMC on this, but my understanding is that utilization is one of those things that has a complex algorithm calculating it in the background and it cannot be relied on entirely. Usually it is a good indicator, but it isn't an absolute number.

You overloaded a LUN(3+1), it does not mean the SP is busy, just the backend of the CLARiiON
Here are some parameters recommended by EMC CLARiiON Best Practices:
FC disks (I/Os)
Threshold value = 160
ATA disks (I/Os)
Threshold value = 70
seeking FC disks
Threshold value = 10% of diskcap. or > 30GB/s
seeking ATA disks
Threshold value = 10% of diskcap. or > 30GB/s
FC disks response time
Threshold value = 15ms (total iops > 20)
ATA disks response time
Threshold value = 15ms (total iops > 20)

The utilization graph was for the LUN, not the SP. With that said, what does a med-low utilization but HIGH IOPS for a LUN tell me?

Thanks.

Please see the documents available at PowerLink:


EMC CLARiiON Best Practices for Fibre Channel Storage: FLARE Release 26 Firmware Update - Best Practices Planning

http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H2358_clariion_best_prac_fibre_chnl_wp_ldv.pdf

EMC CLARiiON Fibre Channel Storage Fundamentals - Technology Concepts and Business Considerations

http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1049_emc_clariion_fibre_channel_storage_fundamentals_ldv.pdf

In additional, if you click on HELP in Navisphere and look for the Analyzer section, most of your questions are covered.

glen

Message was edited by:
kelleg

I'm working with a Support guy to verify that Analyzer is installed correctly. The stats seem wrong for some reason. We'll see.

Thanks for the nice feedback.

Smaller I/O's can be services more per second than very large ones, so you might see 1000 iops with I/O's of 1kB and 30 iops with I/O of 1Mb. Bandwith and throughput are ... how do you you say this in english ? .... each other's opposites.... If one is high, the other is low.

Hope it makes some sence

that is called Inversely proportional to each other