Any way to know what files were in a broken ZFS pool?

Question

I have a large ZFS pool of 4 combined drives. Now, the filesystem can not be mounted:

  pool: tank
 state: UNAVAIL
status: One or more devices could not be opened.  There are insufficient
        replicas for the pool to continue functioning.
action: Attach the missing device and online it using 'zpool online'.
   see: http://www.sun.com/msg/ZFS-8000-3C
  scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        tank        UNAVAIL      0     0     0  insufficient replicas
          c10t0d0   ONLINE       0     0     0
          c8t0d0    UNAVAIL      0     0     0  cannot open
          c8t1d0    ONLINE       0     0     0
          c10t1d0   ONLINE       0     0     0

Probably a broken drive (c8t0d0).

I'm not overly concerned by the loss of the data, but I'd love to know exactly which files were in that pool. Is there any way to get a listing of what files were there?

Why does it matter? You've lost some of the data. – ewwhite Apr 15 '12 at 20:08 — ewwhite, Apr 15 '12 at 20:08

ewwhite · Accepted Answer · 2012-04-15T20:08:10.180

5

It looks as though your pool, tank, is comprised of four disks in a striped configuration; e.g. RAID-0 with no redundancy.

Try bringing the disk back online (reseat it, if it's hot-pluggable), check its connections. Run the zpool online command, as given in the error message. See what happens. Short of that, I don't believe there's a way to get a listing of the files.

edited Apr 15 '12 at 20:08

answered Apr 15 '12 at 16:39

ewwhite

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The freezer method may work if the drive is just barely failing. =] – Chris S Apr 16 '12 at 12:57

score 1 · Answer 2 · answered Apr 16 '12 at 17:15

1

I've never tried this myself but you could try the ZFS debugger zdb to get that information. Here's more about it: http://www.cuddletech.com/blog/pivot/entry.php?id=980.

answered Apr 16 '12 at 17:15

mghocke

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That link no longer works :(. This is probably a similar link: https://openzfs.github.io/openzfs-docs/man/8/zdb.8.html. – Sawtaytoes Jul 27 '23 at 09:24

Any way to know what files were in a broken ZFS pool?

2 Answers2