From: Christoph Anton Mitterer <calestyo@scientia.net>
To: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: [BUG] Btrfs scrub sometime recalculate wrong parity in raid5
Date: Mon, 27 Jun 2016 18:39:57 +0200 [thread overview]
Message-ID: <1467045597.6613.9.camel@scientia.net> (raw)
In-Reply-To: <5770AD08.3050201@gmail.com>
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On Mon, 2016-06-27 at 07:35 +0300, Andrei Borzenkov wrote:
> The problem is that current implementation of RAID56 puts exactly CoW
> data at risk. I.e. writing new (copy of) data may suddenly make old
> (copy of) data inaccessible, even though it had been safely committed
> to
> disk and is now in read-only snapshot.
Sure,... mine was just a general thing to be added.
No checksums => no way to tell which block is valid in case of silent
block errors => no way to recover unless by chance
=> should be included as a warning, especially as userland software
starts to automatically set nodatacow (IIRC systemd does so), thereby
silently breaking functionality (integrity+recoverability) assumed by
the user.
Cheers,
Chris-
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next prev parent reply other threads:[~2016-06-27 16:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-25 12:21 [BUG] Btrfs scrub sometime recalculate wrong parity in raid5 Goffredo Baroncelli
2016-06-25 17:25 ` Chris Murphy
2016-06-25 17:58 ` Chris Murphy
2016-06-25 18:42 ` Goffredo Baroncelli
2016-06-25 22:33 ` Chris Murphy
2016-06-26 9:20 ` Goffredo Baroncelli
2016-06-26 16:43 ` Chris Murphy
2016-06-26 2:53 ` Duncan
2016-06-26 22:33 ` ronnie sahlberg
2016-06-26 22:38 ` Hugo Mills
2016-06-27 3:22 ` Steven Haigh
2016-06-27 3:21 ` Steven Haigh
2016-06-27 19:47 ` Duncan
2016-06-27 3:50 ` Christoph Anton Mitterer
2016-06-27 4:35 ` Andrei Borzenkov
2016-06-27 16:39 ` Christoph Anton Mitterer [this message]
2016-09-21 7:28 ` Qu Wenruo
2016-09-21 7:35 ` Tomasz Torcz
2016-09-21 9:15 ` Qu Wenruo
2016-09-21 15:13 ` Chris Murphy
2016-09-22 2:08 ` Qu Wenruo
2016-09-22 2:44 ` Chris Murphy
2016-09-22 3:00 ` Qu Wenruo
2016-09-22 3:12 ` Chris Murphy
2016-09-22 3:07 ` Christoph Anton Mitterer
2016-09-22 3:18 ` Qu Wenruo
2016-09-21 15:02 ` Chris Murphy
2016-11-04 2:10 ` Qu Wenruo
2016-11-05 7:23 ` Goffredo Baroncelli
-- strict thread matches above, loose matches on Subject: below --
2016-07-12 21:50 [BUG] Btrfs scrub sometime recalculate wrong parity in raid5: take two Goffredo Baroncelli
2016-07-16 15:51 ` [BUG] Btrfs scrub sometime recalculate wrong parity in raid5 Jarkko Lavinen
2016-07-17 19:46 ` Jarkko Lavinen
2016-07-18 18:56 ` Goffredo Baroncelli
2016-08-19 13:17 Philip Espunkt
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