VM Migration from ZFS to LVM thin

[shofman]

Hello,
I'm quite new on Proxmox and I'm playing with it on a lab.
2 hosts with Proxmox 8.2.4

1 host has ZFS pool, and the other one has an LVM thin storage on RAID Hardware.
So I try to move a VM (Windows 11, without snapshot) from one host (pve1) to another (pvetest).

I have this error message :
2024-08-23 18:27:07 starting migration of VM 102 to node 'pvetest' (192.168.1.23)
2024-08-23 18:27:07 found local disk 'DATA:vm-102-disk-0' (attached)
2024-08-23 18:27:07 found local disk 'DATA:vm-102-disk-1' (attached)
2024-08-23 18:27:07 found generated disk 'DATA:vm-102-disk-2' (in current VM config)
2024-08-23 18:27:07 copying local disk images
2024-08-23 18:27:07 ERROR: storage migration for 'DATA:vm-102-disk-2' to storage 'RAID' failed - cannot migrate from storage type 'zfspool' to 'lvmthin'
2024-08-23 18:27:07 aborting phase 1 - cleanup resources
2024-08-23 18:27:07 ERROR: migration aborted (duration 00:00:00): storage migration for 'DATA:vm-102-disk-2' to storage 'RAID' failed - cannot migrate from storage type 'zfspool' to 'lvmthin'
TASK ERROR: migration aborted

root@pve1:~# cat /etc/pve/storage.cfg
dir: local
path /var/lib/vz
content iso,backup,vztmpl

zfspool: local-zfs
pool rpool/data
content images,rootdir
nodes pve1
sparse 1

dir: ISO
path /DATA/ISO
content iso,vztmpl
nodes pve1
prune-backups keep-all=1
shared 0

zfspool: DATA
pool DATA
blocksize 64k
content rootdir,images
mountpoint /DATA
nodes pve1
sparse 1

lvmthin: RAID
thinpool RAID
vgname RAID
content rootdir,images
nodes pvetest



Can someone explain what I'm doing wrong ?

 

[shofman]

It's very strange, because migration from LVM Thin to ZFS wotks...

Another problem : the migration is not thin.
The drive is 32Gb, and it use 32gb on ZFS :

~# zfs list
NAME USED AVAIL REFER MOUNTPOINT
DATA 65.3G 2.55T 186K /DATA
DATA/ISO 6.56G 2.55T 6.56G /DATA/ISO
DATA/base-101-disk-0 2.94G 2.55T 2.94G -
DATA/vm-100-disk-00 2.94G 2.55T 2.94G -
DATA/vm-102-disk-0 668K 2.55T 668K -
DATA/vm-102-disk-1 20.9G 2.55T 20.9G -
DATA/vm-102-disk-2 145K 2.55T 145K -
DATA/vm-103-disk-0 32.0G 2.55T 32.0G -
rpool 2.06G 227G 104K /rpool
rpool/ROOT 2.05G 227G 96K /rpool/ROOT
rpool/ROOT/pve-1 2.05G 227G 2.05G /
rpool/data 96K 227G 96K /rpool/data
rpool/var-lib-vz 96K 227G 96K /var/lib/vz

 

[shofman]

Another try : Ubuntu go back to pvetest.
And now it works... but with 100% space used

# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
RAID5 RAID5 twi-aotz-- <1.07t 2.93 0.26
vm-103-disk-0 RAID5 Vwi-aotz-- 32.00g RAID5 100.00
data pve twi-aotz-- 337.86g 0.00 0.50
root pve -wi-ao---- 96.00g
swap pve -wi-ao---- 8.00g



I don't understand !