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 Post subject: Re: Array wide latency during big (1 MB+) writes
PostPosted: Wed May 20, 2020 1:58 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1130
Location: Europe
What about queue size? How is that configured on Vmware?

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 Post subject: Re: Array wide latency during big (1 MB+) writes
PostPosted: Wed Jul 08, 2020 8:14 am 

Joined: Tue Apr 01, 2014 8:27 pm
Posts: 21
MammaGutt wrote:
What about queue size? How is that configured on Vmware?


QD increased to 128 from default 64 earlier - it made difference (50-100% improvement) with small IO sizes, but not with big ones.


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 Post subject: Re: Array wide latency during big (1 MB+) writes
PostPosted: Wed Jul 08, 2020 11:20 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1130
Location: Europe
qbas81 wrote:
MammaGutt wrote:
What about queue size? How is that configured on Vmware?


QD increased to 128 from default 64 earlier - it made difference (50-100% improvement) with small IO sizes, but not with big ones.


Weird. My experience is usually higher QD = higher IOPS and latency. Lower QD = lower IOPS and latency. Queued IOs "collect" latency too.

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