Date: Fri, 2 Sep 2016 23:16:39 +0300 From: Volodymyr Kostyrko <arcade@b1t.name> To: freebsd-fs@freebsd.org Subject: Re: phantom snapshots Message-ID: <57C9DE27.8020806@b1t.name> In-Reply-To: <bbb97a59-df1c-4ffc-f41b-953b0018c903@kateley.com> References: <58816ff0-3ab2-cbae-3d50-c4d5e89d9773@kateley.com> <57C9D1FB.6040904@b1t.name> <bbb97a59-df1c-4ffc-f41b-953b0018c903@kateley.com>
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Linda Kateley wrote: > > > On 9/2/16 2:24 PM, Volodymyr Kostyrko wrote: >> 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. > How did you remove the files in the snapshot? I keep trying but it is > read-only? Can I remount it read-write? I just removed snapshots. Snapshot can't be remounted r/w. Snapshot can be cloned to obtain writable FS access, but after that snapshots become indestructible until only one snapshot successor remains. -- Sphinx of black quartz judge my vow.
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