Unable to import degraded zpool

[Arthur Ramsey]

Hello,

I had 2 pools on Nexenta 4.  One pool caused Nexenta to boot loop, so I 
decided to install FreeNAS 9.10.2.  No idea why it starting acting up: 
no changes were made nor was a scrub started.  I've previously migrated 
pools from Nexenta 4 to FreeNAS 9.3 without issue.  FreeNAS reported one 
of the pools reported as corrupted though all disks were online, which 
is the pool that was causing the boot loop I think.  I recreated that 
pool since the data was more easily replaceable.  I had another pool 
that reported as online, but it failed to import with a missing disk 
error and dmesg had errors about incompatible mediasize.  One disk was 
shown with the blkdev name (daXXpX) in the zfs import output and zdb -l 
revealed what I thought was a label for an old pool, so I did a zpool 
labelclear on it; however, it still failed to import with the same error 
and as expected now reported as degraded.  I then tried FreeNAS 9.3.1 
and got the same missing disk error, but nothing interesting in dmesg: 
http://pastebin.com/w0VBcCfy, http://pastebin.com/NH0uyULV.  No 
combination of -f, -F, -n, -N, -X, -T or -o readonly=on will import the 
pool on FreeNAS 9.3.1, FreeNAS 9.10.2, OpenIndiana Hipster or Ubuntu 
16.04.1.  On FreeNAS, I had vfs.zfs.recover=1 and vfs.zfs.debug=1.  A 
memory test passed on the machine and the recreated pool seemed to work 
OK, but I tried moving the pool's disks to a known good machine running 
FreeNAS 9.3 and I had the same result.

# zpool import
    pool: xensr
      id: 17993649064102742628
   state: DEGRADED
  status: The pool was last accessed by another system.
  action: The pool can be imported despite missing or damaged devices.  The
         fault tolerance of the pool may be compromised if imported.
    see: http://illumos.org/msg/ZFS-8000-EY
  config:

         xensr                                           DEGRADED
           mirror-0                                      DEGRADED
             gptid/f3ececf5-a319-9266-b870-bc3259f24b68  ONLINE
             5862692444503195050                         UNAVAIL  cannot 
open
           mirror-1                                      ONLINE
             mfisyspd6p1                                 ONLINE
             gptid/7cbacbcb-30f8-b5cd-a569-c92eea865edd  ONLINE
           mirror-3                                      ONLINE
             mfisyspd5p1                                 ONLINE
             mfisyspd4p1                                 ONLINE
           mirror-4                                      ONLINE
             mfisyspd3p1                                 ONLINE
             mfisyspd1p1                                 ONLINE
         cache
           12574043822818177481
         spares
           11626098521560667599
         logs
           mirror-2                                      ONLINE
             mfisyspd8p1                                 ONLINE
             mfisyspd7p1                                 ONLINE

# zpool import -f xensr
cannot import 'xensr': one or more devices is currently unavailable

Could it be a bug with importing non-exported degraded pools or 
unreported corruption?  I tried the FreeNAS IRC channel and got some 
assistance, but no solution.  I cannot get logged into their forums. The 
OpenZFS advises to use platform specific mailing lists.  I decided to 
try this mailing list.


Thanks,
Arthur

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