Moving disk to or from thin-lvm pool extrimly slow.

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nik-weter

Active Member
Sep 24, 2012
24
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Hi.
I have srange situation. When i move disk of linux vm from or to thin lvm pool, i have very high wa for all vm which have disk on that pool.
I cant do ssh to that vm, cant ping them, get "TASK ERROR: Failed to run vncproxy." with console.
That pool's on sas ssd. Quite old servers proliant dl180 g6, but usual lvm vg works fine.
Proxmox 6.4. Yes, i know, i should upgrade to 7.1, but what's the problem&
 
Wow! Its not only thin lvm! Allways when I move vm disk from or to lvm storage its very slow if inside vm also lvm!
 
Ok, solution is right filter in lvm.conf
There weren't comma after "r|/dev/mapper/pve-.*|" in original file. I dont know its mistake or not.
That's mine.
global_filter = [ "r|/dev/zd.*|", "r|/dev/mapper/pve-.*|", "r|/dev/mapper/.*-(vm|base)--[0-9]+--disk--[0-9]+|", "r|/dev/ssdvg/*|", "r|/dev/iscsivg/*|"]

iscsivg and ssdvg - my lvm storages.
Now all works fine.
 
For anyone else encountering this issue, I have observed it on PVE 5 and 6 when the NIC and Storage are both slow (HP G6 as well, with a poor storage server running under 50MB/s and gigabit NICs). This can also affect your ability to create VMs with large (>200GB disks).

Glad you figured it out Nik-water.

Tmanok
 
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