tl;dr: I am running a FreeBSD 11.2 NAS server with ZFS on a server with 16GB ECC memory. I've discovered that my main pool has disappeared. ZFS can see the pool, but reports fault ZFS-8000-EY and that it
cannot import 'tank': pool may be in use from other system, it was last accessed by nasserver (hostid: 0xaaaaaaaa) on Sat Apr 13 04:16:22 2019, however this pool has never been used by another system and
nasserver is the current host. I am afraid my pool is corrupt. What should I do to attempt to recover it? I have backups, but they are out of date since I have to do them manually. I have not tried to run
zpool import -f tank yet, since I want to be careful to avoid making anything worse.
I am running a FreeBSD 11.2 NAS server with ZFS. I returned from vacation to find the server up, but the NAS volumes were inaccessible. When I ssh'd into the box, I found that my man pool
tank was missing:
root@nasserver:/home/root # zpool status pool: zroot state: ONLINE status: Some supported features are not enabled on the pool. The pool can still be used, but some features are unavailable. action: Enable all features using 'zpool upgrade'. Once this is done, the pool may no longer be accessible by software that does not support the features. See zpool-features(7) for details. scan: scrub repaired 0 in 0h0m with 0 errors on Sat Mar 23 03:01:44 2019 config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 diskid/DISK-XXXXXXXXXXXXXXXXXXX1 ONLINE 0 0 0 diskid/DISK-XXXXXXXXXXXXXXXXXXX2 ONLINE 0 0 0 errors: No known data errors
The drives appear to be available, and I tried to import them, but ZFS reports that it
cannot import 'tank': pool may be in use from other system, it was last accessed by nasserver (hostid: 0xaaaaaaaa) on Sat Apr 13 04:16:22 2019. This is odd, because I have never used these disks on another system and the hostname reported is the hostname of the machine they're attached to:
root@nasserver:/home/root # zpool import pool: tank id: 12345678901234567901 state: ONLINE status: The pool was last accessed by another system. action: The pool can be imported using its name or numeric identifier and the '-f' flag. see: http://illumos.org/msg/ZFS-8000-EY config: tank ONLINE raidz1-0 ONLINE gpt/tank-1 ONLINE gpt/tank-2 ONLINE gpt/tank-3 ONLINE gpt/tank-4 ONLINE root@nasserver:/home/root # zpool import tank cannot import 'tank': pool may be in use from other system, it was last accessed by nasserver (hostid: 0xaaaaaaaa) on Sat Apr 13 04:16:22 2019 use '-f' to import anyway
I'm afraid my pool may be corrupt. I have backups, but they are somewhat out of date. What should I do to recover my pool?