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Date:      Sat, 2 May 2020 06:15:00 +0200
From:      Ireneusz Pluta <ipluta@wp.pl>
To:        freebsd-questions@freebsd.org
Subject:   How to get rid of an unavailable pool?
Message-ID:  <32264a1f-3bcf-9d74-603d-c201bffd256c@wp.pl>

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Hi group,

(Sorry if this post appears twice. The first one, initially sent from another email account, does 
not seem to appear.)

I have (or rather had) a pool like this:

$ sudo zpool status -v t
   pool: t
  state: UNAVAIL
status: One or more devices are faulted in response to IO failures.
action: Make sure the affected devices are connected, then run 'zpool clear'.
    see: http://illumos.org/msg/ZFS-8000-HC
   scan: none requested
config:

         NAME                     STATE     READ WRITE CKSUM
         t                        UNAVAIL      0     0 0
           mirror-0               UNAVAIL      0     0 0
             4304281762335857859  REMOVED      0     0 0  was /dev/da5
             1909766900844089131  REMOVED      0     0 0  was /dev/da10

errors: Permanent errors have been detected in the following files:

         <metadata>:<0x0>
         <metadata>:<0x1b>
         t:<0x0>

That was a temporary test pool. I forgot to destroy  or at least export the pool before pulling 
these da5 and da10 drives out of the drivebay of the server. Now it can't be exported or destroyed, 
the respective zpool operations hust hang. How to get rid now of this pool, preferably without 
reboot? The da5 and da10 are no longer available to be put back, as they have been already moved 
elsewhere, and are now part of another pool.

I guess the pool got stuck at the time of running /etc/periodic/security/100.chksetuid, when find 
operation within it tried to traverse into the mountpoint of the pool.

The system is FreeBSD 11.2.

Thanks

Irek





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