From: "H. Peter Anvin" <hpa@zytor.com>
To: Mattias Wadenstein <maswan@acc.umu.se>
Cc: Thiemo Nagel <thiemo.nagel@ph.tum.de>,
Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: Re: On the subject of RAID-6 corruption recovery
Date: Mon, 07 Jan 2008 09:20:23 -0800 [thread overview]
Message-ID: <47825F57.8000400@zytor.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0801071055200.20667@montezuma.acc.umu.se>
Mattias Wadenstein wrote:
> On Mon, 7 Jan 2008, Thiemo Nagel wrote:
>
>>> What you call "pathologic" cases when it comes to real-world data are
>>> very common. It is not at all unusual to find sectors filled with
>>> only a constant (usually zero, but not always), in which case your
>>> **512 becomes **1.
>>
>> Of course it would be easy to check how many of the 512 Bytes are
>> really different on a case-by-case basis and correct the exponent
>> accordingly, and only perform the recovery when the corrected
>> probability of introducing an error is sufficiently low.
>
> What is the alternative to recovery, really? Just erroring out and
> letting the admin deal with it, or blindly assume that the parity is wrong?
>
Erroring out. Only thing to do at that point.
-hpa
prev parent reply other threads:[~2008-01-07 17:20 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-28 2:58 On the subject of RAID-6 corruption recovery H. Peter Anvin
2007-12-28 14:38 ` Bill Davidsen
2007-12-28 17:34 ` H. Peter Anvin
2008-01-04 23:59 ` Thiemo Nagel
2008-01-05 0:03 ` H. Peter Anvin
2008-01-05 0:41 ` Thiemo Nagel
2008-01-05 0:45 ` H. Peter Anvin
2008-01-05 1:25 ` Thiemo Nagel
2008-01-05 1:49 ` H. Peter Anvin
2008-01-07 9:28 ` Thiemo Nagel
2008-01-07 9:58 ` Mattias Wadenstein
2008-01-07 11:10 ` Thiemo Nagel
2008-01-07 17:20 ` H. Peter Anvin [this message]
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