VM powered off

[dottore89]

Hi to all!
For a few days now i find a vm turned off.

It seems to shut down when doing somewhat heavier operations like backup or when I launch an apt update.

this is the log on proxmox (101 is the killed VM): LINK

thanks in advance

 

[Lukas Wagner]

It seems like you are running out of memory and the OOM-Killer of the kernel did it's job and killed some process to reclaim RAM.
How much RAM do you have in total and how much RAM have you assigned to your VMs/CTs?

 

[dottore89]

8 total, 4 to vm

 

[Lukas Wagner]

4 GB for PVE should be enough in general [1].

Are you using ZFS by any chance? The ARC (Adaptive Replacement Cache) used by ZFS will use up to half of your system's RAM by default. In theory it should shrink under high memory pressure, but it can be too slow in some situtations. You can limit the maximum size of the ARC if you want [2].

You can check the current size of the ARC by using the arcstat command.

Hope this helps.

https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_system_requirements
https://pve.proxmox.com/wiki/ZFS_on_Linux#sysadmin_zfs_limit_memory_usage

 

[dottore89]

4 GB for PVE should be enough in general [1].

Are you using ZFS by any chance? The ARC (Adaptive Replacement Cache) used by ZFS will use up to half of your system's RAM by default. In theory it should shrink under high memory pressure, but it can be too slow in some situtations. You can limit the maximum size of the ARC if you want [2].

You can check the current size of the ARC by using the arcstat command.

Hope this helps.

https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_system_requirements
https://pve.proxmox.com/wiki/ZFS_on_Linux#sysadmin_zfs_limit_memory_usage

thanks!!
but ZFS in vm filesystem? my vm are all in ext4

 

[Azunai333]

No. Do you use it on the host?

 

[dottore89]

No. Do you use it on the host?

host is EXT4