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From: Gionatan Danti <g.danti@assyoma.it>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Roger Heflin <rogerheflin@gmail.com>,
	Wols Lists <antlists@youngman.org.uk>,
	Reindl Harald <h.reindl@thelounge.net>,
	Roman Mamedov <rm@romanrm.net>,
	Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: Filesystem corruption on RAID1
Date: Sun, 20 Aug 2017 09:24:10 +0200	[thread overview]
Message-ID: <7d0af770699948fb0ecb66185145be05@assyoma.it> (raw)
In-Reply-To: <alpine.DEB.2.20.1708200907440.3655@uplift.swm.pp.se>

Il 20-08-2017 09:14 Mikael Abrahamsson ha scritto:
> After a non-clean poweroff and possible mismatch now between the RAID1
> drives, and now fsck runs. It reads from the drives and fixes problem.
> However because the RAID1 drives contain different information, some
> of the errors are not fixed. Next time anything comes along, it might
> read from a different drive than what fsck read from, and now we have
> corruption.

It can be even worse: if fsck reads from the disks with corrupted data 
and tries to repair based on these corrupted information, it can blow up 
the filesystem completely.

In my case, heavy XFS corruption was prevented by the journal metadata 
checksum, which detected a corrupted journal and stopped mounting. 
However, some minor corruption found their ways onto the dentry/inode 
structures.

Being a backup machine, this was not a big deal, as I simply recreated 
the filesystem from scratch. However, the failure mode (synced writes 
which were corrupted) was quite scary.

Regards.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8

  reply	other threads:[~2017-08-20  7:24 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-13 15:35 Filesystem corruption on RAID1 Gionatan Danti
2017-07-13 16:48 ` Roman Mamedov
2017-07-13 21:28   ` Gionatan Danti
2017-07-13 21:34     ` Reindl Harald
2017-07-13 22:34       ` Gionatan Danti
2017-07-14  0:32         ` Reindl Harald
2017-07-14  0:52           ` Anthony Youngman
2017-07-14  1:10             ` Reindl Harald
2017-07-14 10:46           ` Gionatan Danti
2017-07-14 10:58             ` Reindl Harald
2017-08-17  8:23             ` Gionatan Danti
2017-08-17 12:41               ` Roger Heflin
2017-08-17 14:31                 ` Gionatan Danti
2017-08-17 17:33                   ` Wols Lists
2017-08-17 20:50                     ` Gionatan Danti
2017-08-17 21:01                       ` Roger Heflin
2017-08-17 21:21                         ` Gionatan Danti
2017-08-17 21:23                           ` Gionatan Danti
2017-08-17 22:51                       ` Wols Lists
2017-08-18 12:26                         ` Gionatan Danti
2017-08-18 12:54                           ` Roger Heflin
2017-08-18 19:42                             ` Gionatan Danti
2017-08-20  7:14                               ` Mikael Abrahamsson
2017-08-20  7:24                                 ` Gionatan Danti [this message]
2017-08-20 10:43                                   ` Mikael Abrahamsson
2017-08-20 13:07                                     ` Wols Lists
2017-08-20 15:38                                       ` Adam Goryachev
2017-08-20 15:48                                         ` Mikael Abrahamsson
2017-08-20 16:10                                           ` Wols Lists
2017-08-20 23:11                                             ` Adam Goryachev
2017-08-21 14:03                                               ` Anthony Youngman
2017-08-20 19:11                                           ` Gionatan Danti
2017-08-20 19:03                                         ` Gionatan Danti
2017-08-20 19:01                                       ` Gionatan Danti
2017-08-31 22:55                                     ` Robert L Mathews
2017-09-01  5:39                                       ` Reindl Harald
2017-09-01 23:14                                         ` Robert L Mathews
2017-08-20 23:22                                 ` Chris Murphy
2017-08-21  5:57                                   ` Gionatan Danti
2017-08-21  8:37                                   ` Mikael Abrahamsson
2017-08-21 12:28                                     ` Gionatan Danti
2017-08-21 14:09                                       ` Anthony Youngman
2017-08-21 17:33                                     ` Chris Murphy
2017-08-21 17:52                                       ` Reindl Harald
2017-07-14  1:48         ` Chris Murphy
2017-07-14  7:22           ` Roman Mamedov

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