thin pool pve-data get lost during upgrade – need new one

[ivenae]

I have a PVE installation without any machines since 2021. Its job was to serve a local samba service.

I brought this to PVE 8 and now wanted to install the first lxc.

This failed, because the pve-data pool was not found anymore. So i wanted to remove the rest of the old data pool (which worked) and create a new pool, but proxmox always told me, that there is no free space to create a new.

If i try to create a thin pool via GUI, it says: There is no free disk, or There is no free space to create a pool.

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

root@pve:~# lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda            8:0    0 931.5G  0 disk
├─sda1         8:1    0  1007K  0 part
├─sda2         8:2    0   512M  0 part /boot/efi
└─sda3         8:3    0   931G  0 part
  └─pve-root 253:0    0 847.5G  0 lvm  /
sdb            8:16   0 931.5G  0 disk
└─sdb1         8:17   0 931.5G  0 part

root@pve:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
udev                  3.7G     0  3.7G   0% /dev
tmpfs                 752M  4.1M  748M   1% /run
/dev/mapper/pve-root  834G  154G  645G  20% /
tmpfs                 3.7G   34M  3.7G   1% /dev/shm
tmpfs                 5.0M     0  5.0M   0% /run/lock
/dev/sda2             511M  312K  511M   1% /boot/efi
/dev/fuse             128M   16K  128M   1% /etc/pve
tmpfs                 752M     0  752M   0% /run/user/0

root@pvs:~# pvs
  PV         VG  Fmt  Attr PSize    PFree
  /dev/sda3  pve lvm2 a--  <931.01g 83.50g

root@pvs:~# vgs
  VG  #PV #LV #SN Attr   VSize    VFree
  pve   1   1   0 wz--n- <931.01g 83.50g

root@pvs:~# lvs
  LV   VG  Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root pve -wi-ao---- <847.51g

root@pvs:~# lvcreate -n vz -V 80G pve/data
  Pool data not found in Volume group pve.

Any ideas to get that pool back?

 

[ivenae]

I do not know why i was not able to solve that ealier, but the first two commands on this page solves my problem:

https://pve.proxmox.com/wiki/Storage:_LVM_Thin

lvcreate -L 100G -n data pve
lvconvert --type thin-pool pve/data

After that i had to add a new pool under
DATACENTER -> STORAGE -> ADD -> lvm thin

root@pve:~# lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda            8:0    0 931.5G  0 disk
├─sda1         8:1    0  1007K  0 part
├─sda2         8:2    0   512M  0 part /boot/efi
└─sda3         8:3    0   931G  0 part
  └─pve-root 253:0    0 847.5G  0 lvm  /
sdb            8:16   0 931.5G  0 disk
└─sdb1         8:17   0 931.5G  0 part
root@pve:~# lvcreate -L 80G -n data pve
  Logical volume "data" created.

root@pve:~# lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda            8:0    0 931.5G  0 disk
├─sda1         8:1    0  1007K  0 part
├─sda2         8:2    0   512M  0 part /boot/efi
└─sda3         8:3    0   931G  0 part
  ├─pve-root 253:0    0 847.5G  0 lvm  /
  └─pve-data 253:1    0    80G  0 lvm
sdb            8:16   0 931.5G  0 disk
└─sdb1         8:17   0 931.5G  0 part
root@pve:~# lvconvert --type thin-pool pve/data
  Thin pool volume with chunk size 64.00 KiB can address at most <15.88 TiB of data.
  WARNING: Converting pve/data to thin pool's data volume with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
Do you really want to convert pve/data? [y/n]: y
  Converted pve/data to thin pool.

root@pve:~# lsblk
NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sda                  8:0    0 931.5G  0 disk
├─sda1               8:1    0  1007K  0 part
├─sda2               8:2    0   512M  0 part /boot/efi
└─sda3               8:3    0   931G  0 part
  ├─pve-root       253:0    0 847.5G  0 lvm  /
  ├─pve-data_tmeta 253:1    0    80M  0 lvm
  │ └─pve-data     253:3    0    80G  0 lvm
  └─pve-data_tdata 253:2    0    80G  0 lvm
    └─pve-data     253:3    0    80G  0 lvm
sdb                  8:16   0 931.5G  0 disk
└─sdb1               8:17   0 931.5G  0 part

( Do not forget: After that you have to add a new pool under
DATACENTER -> STORAGE -> ADD -> lvm thin)


Thanx for your question ivenae.
Thx for your great reply, ivenae, too.

;-)