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3 Replies Latest reply: Sep 3, 2013 2:05 PM by Henk Vandenbergh RSS

Reg vdbench iorate is getting decreased for every run

lksece2 Newbie
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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.

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