Storage

 View Only

  • 1.  Performance Metric GAVG is too high

    Posted Jul 10, 2012 01:15 PM

    Dear team


    one of my VM performing very slow then i have found the datastore where it's vmdk located the GAVG/cmd latency is 600 + , (as suggested by duncan epping the threshold limit is 27), i just want to know if GAVG threshold metric exceed to 600+ then what will be the impact..... (DAVG 500 and KAVG 30+)
    need to export only GAVG/cmd metric with the help of esxtop command in batch mode , how to do that ?????.

    Regards

    Mr Vmware



  • 2.  RE: Performance Metric GAVG is too high

    Posted Jul 10, 2012 01:35 PM

    Note: Discussion successfully moved from Enterprise Strategy & Planning to Performance & VMmark



  • 3.  RE: Performance Metric GAVG is too high

    Posted Jul 10, 2012 02:12 PM

    The impact will be that the guest operating system will not respond because your disks are not providing enough throughput.

    Fiber / iSCSI?

    Maish



  • 4.  RE: Performance Metric GAVG is too high

    Posted Jul 10, 2012 04:07 PM

    u mean to say this problem is related to device/LUN, so how we can resolve the same.



  • 5.  RE: Performance Metric GAVG is too high

    Posted Jul 10, 2012 05:57 PM

    High GAVG almost always comes from a high DAVG, which means that your storage is responding VERY slowly.  You need ot contact your storage administrtor or tech support to find out why its responding so slowly - usually it means you are overloading it.



  • 6.  RE: Performance Metric GAVG is too high

    Posted Jul 11, 2012 09:55 AM

    currently  the path selection policy is selected as MRU, if we change to Round Robin will it help to balance the load????

    regards

    Mr Vmware



  • 7.  RE: Performance Metric GAVG is too high
    Best Answer

    Posted Jul 11, 2012 07:37 PM

    It might, but you should check with your array vendor if they support RR.

    Also, 600ms response times indicate far more than just path loading problems - you are probably driving to much IO to the disks - you need to check on that.



  • 8.  RE: Performance Metric GAVG is too high

    Posted Jul 12, 2012 11:26 AM

    Thanks friends,

    just want to know how to export only GAVG metrics data???

    regards

    Mr Vmware



  • 9.  RE: Performance Metric GAVG is too high

    Posted Jul 12, 2012 11:32 AM

    Here you go.

    Using Batch Mode

    Maish

    VMTN Moderator | vExpert

    Author of VMware vSphere Design

    @maishsk | My Blog