Homelab

371 readers

9 users here now

Rules

Be Civil.
Post about your homelab, discussion of your homelab, questions you may have, or general discussion about transition your skill from the homelab to the workplace.
No memes or potato images.
We love detailed homelab builds, especially network diagrams!
Report any posts that you feel should be brought to our attention.
Please no shitposting or blogspam.
No Referral Linking.
Keep piracy discussion off of this community

founded 1 year ago

MODERATORS

communick@selfhosted.forum

rglullis@communick.news

High storage latency on ESXi host (alien.top)

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

8 comments fedilink hide all child comments

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

you are viewing a single comment's thread
view the rest of the comments

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

GID VMNAME NVDISK CMDS/s READS/s WRITES/s MBREAD/s MBWRTN/s LAT/rd LAT/wr

12953 dns - 1 0.00 0.00 0.00 0.00 0.00 0.000 0.000

16904 fw - 2 5.84 0.00 5.84 0.00 0.02 0.000 18.408

20481 vcsa - 13 16.58 0.00 16.58 0.00 0.08 0.000 37.582

130847 - 2 0.00 0.00 0.00 0.00 0.00 0.000 0.000

626694 deb - 2 12.06 0.00 12.06 0.00 0.46 0.000 6.586

as you can see the is no much IOPS per VM, like vcsa VM latency I captured is floating between 20 and 100ms, while deb has similar IOPS but lower latency

[–] 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 11 months ago

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