3 Replies Latest reply: Sep 3, 2013 4:05 PM by Henk Vandenbergh-Oracle RSS

    Reg vdbench iorate is getting decreased for every run

    lksece2

      Hi,

       

      I am running the below parameter file to test a zfs volume(4TB).


      sd=sd1,lun=/dev/zvol/rdsk/storage0/lu2,thread=16

      wd=wd1,sd=sd1,xfersize=4096,rdpct=0,seekpct=random

      rd=run1,wd=wd1,iorate=max,elapsed=60,interval=1

       

      My understanding is that

      It performs 4K, 100% write, 100% random for 60 sec with max iorate possible. Please confirm.

      When I repeat the same test, the IOPS values are going down. What could be the reason?

       

      Also what is the kind of write IO Pattern it uses -Is it full random IO, pseudo random IO or Repeating bytes?.How to configure these values. Please let me know.