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Date:      Fri, 2 Sep 2016 22:24:43 +0300
From:      Volodymyr Kostyrko <arcade@b1t.name>
To:        FreeBSD Filesystems <freebsd-fs@freebsd.org>
Subject:   Re: phantom snapshots
Message-ID:  <57C9D1FB.6040904@b1t.name>
In-Reply-To: <58816ff0-3ab2-cbae-3d50-c4d5e89d9773@kateley.com>
References:  <58816ff0-3ab2-cbae-3d50-c4d5e89d9773@kateley.com>

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Linda Kateley wrote:
> So I think I have isolated this to a phantom snapshot. At the end of
> this zpool status although the names change everytime I run scrub, it
> show unrecoverable error of files in a snapshot that doesn't exit.
>
> It also has in that zfs dataset it has a .zfs directory with a name of
> old snaps.
>
> Anyone know how to view or clear these phantom snaps? I tried to remove
> the files in the snapshot directory, but it is read-only.

This looks like pointers to files that were already deleted/purged. I 
once faced this errors but that was on bad controller, I don't think 
this can be caused by bad memory/errors. When that happened I scrubbed 
pool, removed all files noted, cleaned zpool errors (they are 
persistent, even the file was removed and snapshots doen't exist they 
are still shown) and scrubbed the pool again.

>
> Ideas?
>
> Linda
>
>
> pool: pool
>   state: ONLINE
> status: One or more devices is currently being resilvered.  The pool will
>      continue to function, possibly in a degraded state.
> action: Wait for the resilver to complete.
>    scan: resilver in progress since Fri Sep  2 10:42:48 2016
>          46.8T scanned out of 144T at 2.48G/s, 11h11m to go
>          46.5G resilvered, 32.40% done
> config:
>
>      NAME                                            STATE     READ
> WRITE CKSUM
>      pool                                            ONLINE 0     0    12
>        raidz3-0                                      ONLINE 0     0     0
>          gptid/ac108605-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ac591d4e-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ac92fd0d-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/accd3076-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ad067e97-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ad46cbee-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ad91ba17-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/adcbdd0a-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ae07dc0d-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ae494d10-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>          gptid/ae93a3a5-265c-11e5-9a02-0cc47a599098  ONLINE 0     0     0
>        raidz3-1                                      ONLINE 0     0     0
>          gptid/12f6a4c5-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/511ea1f9-1932-11e6-9b1e-0cc47a599098  ONLINE 0     0     0
>          gptid/14436fcf-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/14f50aa3-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/159b5654-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/163d682b-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/16ee624e-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/1799dde3-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/184c2ea4-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/18f51c30-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>          gptid/19a861ea-c929-11e5-8075-0cc47a599098  ONLINE 0     0     0
>        raidz3-2                                      ONLINE 0     0    24
>          gptid/5f80fc42-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/60369e0f-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/60e8234a-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/61a235f2-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/62580471-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/6316a38a-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/63d4bce8-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/ebfc2b99-6893-11e6-9b09-0cc47a599098  ONLINE 0     0 0
> (resilvering)
>          gptid/654f143a-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/66236b33-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/66eda3f6-4e00-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>        raidz3-3                                      ONLINE 0     0    24
>          gptid/c77a9da9-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/c83e100e-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/c8fd9ced-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/c9bb21ba-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/ca7a48db-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/cb422329-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/cbfe4c21-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/ccc43528-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/cd93a34c-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/ce622f51-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>          gptid/cf2591d3-4e02-11e6-b7cf-0cc47a599098  ONLINE 0     0     0
>      cache
>        gptid/aedd3872-265c-11e5-9a02-0cc47a599098    ONLINE 0     0     0
>        gptid/af559c10-265c-11e5-9a02-0cc47a599098    ONLINE 0     0     0
>
> errors: Permanent errors have been detected in the following files:
>
>          <0x597>:<0x1246>
>          <0x597>:<0x1249>
>          <0x597>:<0x125e>
>          <0x597>:<0x1261>
>          <0x597>:<0x127d>
>          <0x597>:<0x1280>
>          <0x599>:<0xe2c>
>          <0x599>:<0xe2f>
>          <0x599>:<0xe40>
>          <0x599>:<0xe43>
>          <0x599>:<0xe59>
>          <0x599>:<0xe62>
>          <0x5bc>:<0x2ad06>
>          <0x5bc>:<0x2aef3>
>          <0x5bc>:<0x2aef6>
>          pool/.system@auto-20160720.2300-2d:<0x0>
>          <0x5dc>:<0x397411>
>          <0x5dc>:<0x397414>
>          <0x5dc>:<0x38ee26>
>          <0x5dc>:<0x38ee29>
>          <0x5dc>:<0x38ee2c>
>          <0x5dc>:<0x45b2e>
>          <0x5dc>:<0x38ee2f>
>          <0x5dc>:<0x38ee32>
>          <0x5dc>:<0x394e58>
>          <0x5dc>:<0x394e5b>
>          <0x5dc>:<0x394e5e>
>          <0x5dc>:<0x394e61>
>          <0x5dc>:<0x394e64>
>          <0x5dc>:<0x394e67>
>          <0x5dc>:<0x394e6a>
>          <0x5dc>:<0x397285>
>
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-- 
Sphinx of black quartz judge my vow.



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