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Array wide latency during big (1 MB+) writes
https://3parug.com/viewtopic.php?f=18&t=3394
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Author:  MammaGutt [ Wed May 20, 2020 1:58 am ]
Post subject:  Re: Array wide latency during big (1 MB+) writes

What about queue size? How is that configured on Vmware?

Author:  qbas81 [ Wed Jul 08, 2020 8:14 am ]
Post subject:  Re: Array wide latency during big (1 MB+) writes

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.

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

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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