Reason PVE host keep write data to disk?

alexc

Active Member
Apr 13, 2015
123
4
38
I have single PVE server (6.4, community repo) and I noticed It has constant iodelay > 0 even when host is almost idle. The host is very low loaded, so not expected to see that.

There is single m2 NVMe disk on board (Samsung 970 EVO Plus) installed mostly as a test disk, and couple of Intel 545 SSD SATA disks which are pit in ZFS mirror.

Can’t figure out the only thing: what can produce constant iodelay to disks?

By the way, both Intel SSDs has 27% of wearout even that they are online for maybe 3-4 months. So I suspect constant write steam is definitely there. But the source of it is unknown.

Please advice, how can I find the source of that activity!
 

oguz

Proxmox Retired Staff
Retired Staff
Nov 19, 2018
5,207
708
118
hi,

Please advice, how can I find the source of that activity!
you can check the processes with iotop and investigate further from there
 

alexc

Active Member
Apr 13, 2015
123
4
38
hi,


you can check the processes with iotop and investigate further from there
I did that, no clear picture. VMs are very low intense on I/O, and the only thing I see is zfs-related processes. But I suspect 20+% of wearout for 2-3 months is high a bit for zfs scrub mostly.
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get your own in 60 seconds.

Buy now!