Resize rpool/ROOT/pve-1 live

[Valerio Pachera]

Hi all, I have a Proxmox 5 server with 2 ssd in zfs raid 1.
During setup I let Proxmox installer to choose the size of swap and root (/).
The root virtual size is huge: 85G and I wish to shrink it.

Is it possible to resize rpool/ROOT/pve-1 live?
How?

df -h /
Filesystem        Size  Used Avail Use% Mounted on
rpool/ROOT/pve-1   85G  5.2G   80G   7% /

zpool list rpool
NAME    SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
rpool   232G   141G  91.3G         -    37%    60%  1.00x  ONLINE  -

zfs list
NAME                       USED  AVAIL  REFER  MOUNTPOINT
rpool                      145G  79.7G    96K  /rpool
rpool/ROOT                5.14G  79.7G    96K  /rpool/ROOT
rpool/ROOT/pve-1          5.14G  79.7G  5.14G  /
rpool/data                 131G  79.7G    96K  /rpool/data
rpool/data/vm-100-disk-1   131G  79.7G   131G  -
rpool/swap                8.50G  84.0G  4.17G  -

 

[dendi]

Hi Valerio,
you don't need to shrink root partition, because 85 GB is the total space of zfs pool.
This space will be uset for VMs too in thin provisioning

 

[Valerio Pachera]

Thank you for your reply.
Well, what I fear is something start writing in the / filling up all the availabel space.
This is unprobabile but no impossible.

Virtual space of rpool/ROOT + virtual space of rpool/data > phisical space.

In such case, the gest will start getting I/O.
In the worse case, the guest filesystem may corrupt.
I didn't test this on zfs but once I had a guest corrupted on lvm-thin because of overbooking.
I would feel more safe if the sum of virtual space is smaller than the physical space, also for snapshots use.

So, do anybody know if it's possible to resize / live ?

 

[Nemesiz]

You can set quota for rpool/ROOT/pve-1

#zfs set quota=10G rpool/ROOT/pve-1