"ZFS: can't find pool by guid" after reboot during 11.1 to 11.2 upgrade

Jeff Chan jeffc at supranet.net
Wed Oct 3 01:39:03 UTC 2018


Hi Folks,
Apologies in advance if this isn't the right place to ask.  Wasn't
sure if it was perhaps related to the 11.2 ZFS-related boot loader
changes though.

During a FreeBSD upgrade from 11.1 to 11.2, after the reboot step
between freebsd-update installs, got an error from the boot loader:


ZFS: can't find pool by guid
ZFS: can't find pool by guid
ZFS: can't find pool by guid

can't load 'kernel'




Booting from memstick USB into liveCD to get some diagnostics:


root@:~ # gpart show
=>        34  5860533101  da0  GPT  (2.7T)
          34           6       - free -  (3.0K)
          40        1024    1  freebsd-boot  (512K)
        1064    16777216    2  freebsd-swap  (8.0G)
    16778280  5843754848    3  freebsd-zfs  (2.7T)
  5860533128           7       - free -  (3.5K)

=>        34  5860533101  diskid/DISK-Z1Z36VFN00009426QDUJ  GPT  (2.7T)
          34           6                                    - free -  (3.0K)
          40        1024                                 1  freebsd-boot  (512K)
        1064    16777216                                 2  freebsd-swap  (8.0G)
    16778280  5843754848                                 3  freebsd-zfs  (2.7T)
  5860533128           7                                    - free -  (3.5K)

=>        34  5860533101  da1  GPT  (2.7T)
          34           6       - free -  (3.0K)
          40        1024    1  freebsd-boot  (512K)
        1064    16777216    2  freebsd-swap  (8.0G)
    16778280  5843754848    3  freebsd-zfs  (2.7T)
  5860533128           7       - free -  (3.5K)

=>        34  5860533101  da2  GPT  (2.7T)
          34           6       - free -  (3.0K)
          40        1024    1  freebsd-boot  (512K)
        1064    16777216    2  freebsd-swap  (8.0G)
    16778280  5843754848    3  freebsd-zfs  (2.7T)
  5860533128           7       - free -  (3.5K)

=>        34  5860533101  da3  GPT  (2.7T)
          34           6       - free -  (3.0K)
          40        1024    1  freebsd-boot  (512K)
        1064    16777216    2  freebsd-swap  (8.0G)
    16778280  5843754848    3  freebsd-zfs  (2.7T)
  5860533128           7       - free -  (3.5K)

=>        34  5860533101  diskid/DISK-Z1Z38VVZ000094274QNB  GPT  (2.7T)
          34           6                                    - free -  (3.0K)
          40        1024                                 1  freebsd-boot  (512K)
        1064    16777216                                 2  freebsd-swap  (8.0G)
    16778280  5843754848                                 3  freebsd-zfs  (2.7T)
  5860533128           7                                    - free -  (3.5K)

=>        34  5860533101  diskid/DISK-Z1Y084BY  GPT  (2.7T)
          34           6                        - free -  (3.0K)
          40        1024                     1  freebsd-boot  (512K)
        1064    16777216                     2  freebsd-swap  (8.0G)
    16778280  5843754848                     3  freebsd-zfs  (2.7T)
  5860533128           7                        - free -  (3.5K)

=>        34  5860533101  diskid/DISK-Z1Y2YWBN0000C524DDKE  GPT  (2.7T)
          34           6                                    - free -  (3.0K)
          40        1024                                 1  freebsd-boot  (512K)
        1064    16777216                                 2  freebsd-swap  (8.0G)
    16778280  5843754848                                 3  freebsd-zfs  (2.7T)
  5860533128           7                                    - free -  (3.5K)

=>       1  62652415  da4  MBR  (30G)
         1      1600    1  !239  (800K)
      1601   1505616    2  freebsd  [active]  (735M)
   1507217  61145199       - free -  (29G)

=>      0  1505616  da4s2  BSD  (735M)
        0       16         - free -  (8.0K)
       16  1505600      1  freebsd-ufs  (735M)

=>       1  62652415  diskid/DISK-0336216080014934  MBR  (30G)
         1      1600                             1  !239  (800K)
      1601   1505616                             2  freebsd  [active]  (735M)
   1507217  61145199                                - free -  (29G)

=>      0  1505616  diskid/DISK-0336216080014934s2  BSD  (735M)
        0       16                                  - free -  (8.0K)
       16  1505600                               1  freebsd-ufs  (735M)



(da4 is the USB drive, obviously)



root@:~ # zpool import
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
   pool: zroot
     id: 12421595622411140545
  state: ONLINE
 status: Some supported features are not enabled on the pool.
 action: The pool can be imported using its name or numeric identifier, though
        some features will not be available without an explicit 'zpool upgrade'.
 config:

        zroot                                 ONLINE
          raidz1-0                            ONLINE
            diskid/DISK-Z1Z36VFN00009426QDUJ  ONLINE
            diskid/DISK-Z1Z38VVZ000094274QNB  ONLINE
            diskid/DISK-Z1Y084BY              ONLINE
            diskid/DISK-Z1Y2YWBN0000C524DDKE  ONLINE

   pool: zroot
     id: 6087619269570541526
  state: ONLINE
 status: Some supported features are not enabled on the pool.
 action: The pool can be imported using its name or numeric identifier, though
        some features will not be available without an explicit 'zpool upgrade'.
 config:

        zroot       ONLINE
          raidz1-0  ONLINE
            da0p3   ONLINE
            da1p3   ONLINE
            da2p3   ONLINE
            da3p3   ONLINE




Not able to import zroot by name:


root@:~ # zpool import -fR /mnt zroot
cannot import 'zroot': more than one matching pool
import by numeric ID instead



What's the best way to fix this?


Also the zpool hasn't been upgraded in a long time, and I wonder if
that interacted with the 11.2 boot loader code change:

https://www.freebsd.org/releases/11.2R/relnotes.html#boot-loader

> 9.1. Boot Loader Changes
>
> The boot code and loader(8) have been updated to check for
> unsupported ZFS feature flags. If unsupported features are active,
> the pool is not considered as a bootable pool, and a diagnostic
> message is printed to the console. [r321519]

and the related patch:

https://svnweb.freebsd.org/base?view=revision&revision=321519


If we should do a zpool upgrade, can that be done from the liveCD
safely?  This is a hot spare of a production system, and it would be
nice if it could be restored to operation with a few commands.

There's (always) the chance that a hard drive is wearing out too,
though recent zpool scrubs seem fine, and smartctl errors look ok.
Much easier to fix from a running system if needed.

Thanks in advance for any advice!

Cheers,

Jeff C.
--
Jeff Chan
mailto:jeffc at supranet.net



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