Shrinking ZFS filesystem for LXC CT

[Don Daniello]

Howdy,

I have given Proxmox on ZFS a test run recently (having used Proxmox for many users without ZFS).

I was hoping that Proxmox on ZFS would allow LXC containers to have their disk allocation both extended and shrunk. However, the Proxmox GUI does not seem to allow that.

Running the command

zfs set refquota=3G rpool/data/subvol-100-disk-1

manually seems to work correctly. Probably one thing missing is updating /etc/pve/lxc/100.conf, because it still has

rootfs: local-zfs:subvol-100-disk-1,size=5G

and therefore GUI keeps showing 5 GB as disk size.

Is there any reason why such adjustment is not supported by Proxmox yet? Any technical obstacle that I have missed? Or simply it's not been developed yet (in which case I could work on a patch)?

 

[wolfgang]

Hi,

we try that things work every where the same way .
Shrinking is only so easy with ZFS and and we will not do this on other storage types.

 

[tuxillo]

Can't it be conditionalized to ZFS only in the UI?

 

[wolfgang]

Can't it be conditionalized to ZFS only in the UI?

The problem is with such conditional exceptions that they confuse users
So we do keep things as general as it can be.

 

[cserem]

Howdy,

I have given Proxmox on ZFS a test run recently (having used Proxmox for many users without ZFS).

I was hoping that Proxmox on ZFS would allow LXC containers to have their disk allocation both extended and shrunk. However, the Proxmox GUI does not seem to allow that.

Running the command

zfs set refquota=3G rpool/data/subvol-100-disk-1

manually seems to work correctly. Probably one thing missing is updating /etc/pve/lxc/100.conf, because it still has

rootfs: local-zfs:subvol-100-disk-1,size=5G

and therefore GUI keeps showing 5 GB as disk size.

Is there any reason why such adjustment is not supported by Proxmox yet? Any technical obstacle that I have missed? Or simply it's not been developed yet (in which case I could work on a patch)?

I belive you can update the container/qemu storage configs, after manual resizing with:

pct rescan

or

qm rescan