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High storage latency on ESXi host (alien.top)

submitted 1 year ago by bonaventura84@alien.top to c/homelab@selfhosted.forum

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I've been going back and forth with this issue for some time but honestly I have no idea if the vCenter telemetry is something to rely on. I'm experiencing rather high latency on the storage on my VMs, most of them idle, only vCenter and virtual firewall generate some IOPS, 5 are shut down, other 3 VMs are linux machines that idle for 99%, even though they can spike 100ms per IO. Today I have decided to migrate a VM storage to another server to find that higher disk utilization reduces the latency on the host, how that makes any sense? I'm using P420 in RAID 10 with 4x4TB 7k SAS HDDs.

Host latency:

https://preview.redd.it/cqvmy550ty1c1.png?width=986&format=png&auto=webp&s=f5823391eb6cd82cb9612b44aa2768087bf619e1

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[–] Roland_Bodel_the_2nd@alien.top 1 points 1 year ago (1 children)

I think what you want to do is go into your db vm and run a DD or fio or bonnie++ that is at least 2 x the VM RAM, and see what the steady-state disk performance is.

[–] bonaventura84@alien.top 1 points 1 year ago

I don’t have db VM, I think you are referring to deb which is short for Debian.