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Array wide latency during big (1 MB+) writes https://3parug.net/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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