Lost data after unmounting ZFS from node

FZR600

New Member
Mar 14, 2026
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Hello everyone,
first time poster and novice Proxmox user

The story from the begining:

I was trying to decrease the root space of an LXC by
Backup - destroy - recreate from backup
And that succeeded without a hitch, the issue was that i had a ZFS mounded to the LXC and the data is now gone.

PANIC

The zfs "tank" is still mounted on Proxmox but no data

1773512740935.png

I tried using this guide https://endlesspuzzle.com/how-to-recover-a-destroyed-dataset-on-a-zfs-pool/

Code:
root@Proxmox:~# zpool status
  pool: flash
 state: ONLINE
config:

        NAME                                            STATE     READ WRITE CKSUM
        flash                                           ONLINE       0     0     0
          mirror-0                                      ONLINE       0     0     0
            ata-ST3500413AS_6VMV0D2B                    ONLINE       0     0     0
            ata-WDC_WD5000LPVX-22V0TT0_WD-WXD1E63NJKD7  ONLINE       0     0     0

errors: No known data errors
root@Proxmox:~# zpool import
  pool: tank
    id: 13119352235955772345
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

        tank                               ONLINE
          ata-ST4000VN006-3CW104_WW69DL1E  ONLINE
root@Proxmox:~# zpool import -T 97913 tank
cannot import 'tank': one or more devices is currently unavailable

I found the txg tag to be 97914
Code:
2026-03-14.17:34:29 [txg:97914] destroy tank/subvol-100-disk-0 (387) (bptree, mintxg=1) [on Proxmox]

But it was not possible to recover from that point.

Is there anything to do, or am I screwed?
 
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