From: Michael Tokarev <mjt@tls.msk.ru>
To: st0ff@npl.de
Cc: linux-raid@vger.kernel.org
Subject: Re: Feature Request
Date: Tue, 09 Feb 2010 15:28:10 +0300 [thread overview]
Message-ID: <4B7154DA.90405@msgid.tls.msk.ru> (raw)
In-Reply-To: <4B712034.1000600@gmx.net>
Stefan *St0fF* Huebner wrote:
[]
> Now imagine any RAID with some kind of redundancy, reading/writing
> data. One of the disks finds out "I cannot correctly read/write the
> requested sector", starts its error correction, hits the respective
> ERC-timeout and reports back a media error or unrecoverable error. Now
> mdraid would drop the disk.
>
> But actually the data of the sector can be recreated through the
> existing redundancy. Wouldn't it be a smart thing if the mdraid
> recreates the sector and just tried to write it again? And after a good
> amount of failed retries it may well drop the disk.
This is exactly what md layer is doing. On failed _read_ it tries to
reconstruct data from other disk drives and writes the reconstructed
data back to the drive where read failed. If the _write_ fails md will
drop the disk.
/mjt
next prev parent reply other threads:[~2010-02-09 12:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 8:43 Feature Request Stefan *St0fF* Huebner
2010-02-09 12:28 ` Michael Tokarev [this message]
2010-02-09 14:19 ` Stefan Hübner
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