High storage latency on ESXi host (alien.top)

submitted 11 months 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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[-] Wooden-Shape-9521@alien.top 1 points 11 months ago

I have an r710 with 8 WD black 500gb disk in a raid 5, No vcenter. From a cold boot of any flavor VM there is severe disk latency.

 Only way to get past it in my case is a large disk operation, is xfsdump of / solves the latency.

this post was submitted on 22 Nov 2023

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