Topic
  • 7 replies
  • Latest Post - ‏2014-03-19T20:40:32Z by Mangesh Shirke
Mangesh Shirke
Mangesh Shirke
45 Posts

Pinned topic V7000: Performance Monitoring.

‏2014-03-16T18:32:37Z |

Hi Guys,

I was just going through performance monitor tab provided in V7000 GUI. I have noticed that there is big difference between IOPS on volume and IOPS on interface.

My question is why there is big difference between this two IOPS and how to determine this difference.

Thanks.
Mangesh Shirke

  • chriscanto
    chriscanto
    292 Posts
    ACCEPTED ANSWER

    Re: V7000: Performance Monitoring.

    ‏2014-03-16T23:21:26Z  

    Assuming you're talking about the Fibre Channel interface, there will be significantly more I/O seen in that view of performance compared with the volume view as it includes:

    * node-to-node communications, including cache mirroring (which is done using 32kB tracks, so host write I/O larger than this will result in multiple I/O operations between nodes)

    * the value is for send + receive, so the above activity is effectively doubled in the view (as one node sending + another receiving)

    * if there is external storage being virtualised, the view includes backend (mdisk) I/O.

     

  • TMasteen
    TMasteen
    317 Posts
    ACCEPTED ANSWER

    Re: V7000: Performance Monitoring.

    ‏2014-03-18T08:07:50Z  

    Hi TMasteen,

    I don't have TPC available. Can you please let me know what is Qperf and how to use it....???

    Thanks.

    Mangesh,

    Please have a look at http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/TD105947  The zip file has some .pdf files where it's explained.

     

  • chriscanto
    chriscanto
    292 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-16T23:21:26Z  

    Assuming you're talking about the Fibre Channel interface, there will be significantly more I/O seen in that view of performance compared with the volume view as it includes:

    * node-to-node communications, including cache mirroring (which is done using 32kB tracks, so host write I/O larger than this will result in multiple I/O operations between nodes)

    * the value is for send + receive, so the above activity is effectively doubled in the view (as one node sending + another receiving)

    * if there is external storage being virtualised, the view includes backend (mdisk) I/O.

     

  • Mangesh Shirke
    Mangesh Shirke
    45 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-17T03:59:59Z  

    Assuming you're talking about the Fibre Channel interface, there will be significantly more I/O seen in that view of performance compared with the volume view as it includes:

    * node-to-node communications, including cache mirroring (which is done using 32kB tracks, so host write I/O larger than this will result in multiple I/O operations between nodes)

    * the value is for send + receive, so the above activity is effectively doubled in the view (as one node sending + another receiving)

    * if there is external storage being virtualised, the view includes backend (mdisk) I/O.

     

    Thanks for your response. I agree on the points which you have raised. Do we have any document which talk about it in details....???

    Thanks.

  • TMasteen
    TMasteen
    317 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-17T17:10:44Z  

    Thanks for your response. I agree on the points which you have raised. Do we have any document which talk about it in details....???

    Thanks.

    To find out what kind of IO is going through the ports, have a look at the performance data with TPC or Qperf. For example you can see KB's to\from hosts and controllers, and also node to local\remote node traffic.

  • chriscanto
    chriscanto
    292 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-17T20:51:28Z  

    Thanks for your response. I agree on the points which you have raised. Do we have any document which talk about it in details....???

    Thanks.

    I suggest clicking on the 'help' link in the top right of the GUI when on the performance page.

  • Mangesh Shirke
    Mangesh Shirke
    45 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-18T05:55:27Z  
    • TMasteen
    • ‏2014-03-17T17:10:44Z

    To find out what kind of IO is going through the ports, have a look at the performance data with TPC or Qperf. For example you can see KB's to\from hosts and controllers, and also node to local\remote node traffic.

    Hi TMasteen,

    I don't have TPC available. Can you please let me know what is Qperf and how to use it....???

    Thanks.

  • TMasteen
    TMasteen
    317 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-18T08:07:50Z  

    Hi TMasteen,

    I don't have TPC available. Can you please let me know what is Qperf and how to use it....???

    Thanks.

    Mangesh,

    Please have a look at http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/TD105947  The zip file has some .pdf files where it's explained.

     

  • Mangesh Shirke
    Mangesh Shirke
    45 Posts

    Re: V7000: Performance Monitoring.

    ‏2014-03-19T20:40:32Z  
    • TMasteen
    • ‏2014-03-18T08:07:50Z

    Mangesh,

    Please have a look at http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/TD105947  The zip file has some .pdf files where it's explained.

     

    Thanks for your valuable information.