From: "Carl-Johan Wägner" <carl-johan.wagner@agusta.se>
To: linux-raid@vger.kernel.org
Cc: fafler@gmail.com
Subject: Re: RAID 5 with bad blocks
Date: Mon, 27 Sep 2010 17:43:23 +0200 [thread overview]
Message-ID: <20100926232102.M67000@agusta.se> (raw)
In-Reply-To: <20100925000351.M29572@agusta.se>
A follow up on my suggestion:
> Would it be possible to copy (with 'dd') the device (/dev/sdb) with sector
> errors to a fourth disk (/dev/sde) and then remove the faulty sdb-
> drive and reposition the newly copied sde to sdb's position to have
> this act as the first sdb-drive, now working without any physical
> faults, even if the data is incomplete in sectors; and now being
> possible to recover the third drive (/dev/sdd1)?
'dd' is NOT the program one would want to use for this task.
"ddrescue" is the one!
NB: dd_rescue is not the same program, and may or may not work. Just note that
"apt-get install ddrescue" installs dd_rescue, not ddrescue...
ddrescue is downloaded (with e g curl) from:
# curl ftp.gnu.org/gnu/ddrescue/ddrescue-1.13.tar.gz >ddrescue-1.13.tar.gz
Having installed, copied disk to disk and swapped disks the RAID started ti
rebuild /dev/sdd1 and I have now a clean array again!
next prev parent reply other threads:[~2010-09-27 15:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-25 18:47 RAID 5 with bad blocks Carl-Johan Wägner
2010-09-27 15:43 ` Carl-Johan Wägner [this message]
2010-09-27 20:26 ` Daniel Reurich
-- strict thread matches above, loose matches on Subject: below --
2010-09-17 10:52 Lasse Jensen
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