Thin pool metadata repair

alter

New Member
Feb 22, 2019
1
0
1
36
Hi everybody!

We ran into a trouble with our thin pool. The situation is quite usual, but... not.

After a power failure server boots, but no VM start. After a short investigation turned out that thin pool pve/data is inactive.
Found similar solution on RedHat wiki and tried following steps:
Code:
lvremove pve/lvol0_pmspare
lvconvert --repair pve/data

But the last command`s output was:
Code:
Repair of thin metadata volume of thin pool pve/data failed (status:1). Manual repair required!

And here we stuck. All manuals we found are based on fact, that metadata volume is present at least in /dev/pve. But there are only root and swap volumes.
So we can`t make a dump of metadata. All we got is /etc/lvm/backup and /etc/lvm/archive with configs

Made thin_check on /dev/pve/root:
Code:
thin_check /dev/pve/root
examining superblock
  superblock is corrupt
    bad checksum in superblock

Checked /dev/pve/root under live-usb. Nothing changed.
Should we try to make something like e2fsck -f -b 32768 /dev/sda3 (sda3 is pve/data) ? Not sure about results on LVM-based partition.

Would appreciate any help! What could we try to get our pve/data alive?

Thanks in advance!

-----
Code:
lvs -a
  LV              VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  data            pve  twi---tz--   2.63t
  [data_tdata]    pve  Twi-------   2.63t
  [data_tmeta]    pve  ewi-------   2.23g
  [lvol0_pmspare] pve  ewi-------   2.23g
  repaired_01     pve  -wi-------   3.00g
  root            pve  -wi-ao----  96.00g
  swap            pve  -wi-a----- 500.00m
  vm-300-disk-1   pve  Vwi---tz--   5.00g data
  vm-300-disk-2   pve  Vwi---tz-- 800.00g data
  vm-301-disk-1   pve  Vwi---tz--  15.00g data
  vm-301-disk-2   pve  Vwi---tz--   1.81t data

lvscan
  ACTIVE            '/dev/pve/swap' [500.00 MiB] inherit
  ACTIVE            '/dev/pve/root' [96.00 GiB] inherit
  inactive          '/dev/pve/data' [2.63 TiB] inherit
  inactive          '/dev/pve/vm-301-disk-1' [15.00 GiB] inherit
  inactive          '/dev/pve/vm-301-disk-2' [1.81 TiB] inherit
  inactive          '/dev/pve/vm-300-disk-2' [800.00 GiB] inherit
  inactive          '/dev/pve/vm-300-disk-1' [5.00 GiB] inherit
  inactive          '/dev/pve/repaired_01' [3.00 GiB] inherit

lvchange -ay pve/data
  Check of pool pve/data failed (status:1). Manual repair required!

repaired_01 — is from our axperiments. It`s free from any data
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!