From: Lars Marowsky-Bree <lmb@suse.de>
To: Neil Brown <neilb@cse.unsw.edu.au>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
linux-kernel@vger.kernel.org, Mike Fedyk <mfedyk@matchmail.com>
Subject: Re: md: bug in file raid5.c, line 540 was: Re: Linux 2.4.22-rc1
Date: Tue, 26 Aug 2003 19:30:14 +0200 [thread overview]
Message-ID: <20030826173014.GA12071@marowsky-bree.de> (raw)
In-Reply-To: <20030826172257.GE16831@matchmail.com>
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On 2003-08-26T10:22:57,
Mike Fedyk <mfedyk@matchmail.com> said:
> Is there any way to get it working on one partition, or does it require at
> least two backing store block (an actual physical disk) devices that a bunch
> of loop devices point to? (I'm thinking of the raid[15] case).
md will work just fine - although with much reduced performance - if
setup on top of partitions on the same disk. If all you have is a single
physical disk, you can create the loop devices accordingly. For
multipath testing, I have used LVM logical volumes + loop devices to
simulate such, or used UML and fed it with a bunch of block devices (LVs
or loop devices) from the host.
(The mp-test.sh script actually knows how to create arbitary numbers of
loop devices for multipath testing, which in turn uncovered a bug in our
loop handling, which axboe took care of...)
Sincerely,
Lars Marowsky-Brée <lmb@suse.de>
--
High Availability & Clustering ever tried. ever failed. no matter.
SuSE Labs try again. fail again. fail better.
Research & Development, SuSE Linux AG -- Samuel Beckett
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next prev parent reply other threads:[~2003-08-26 17:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-05 18:44 Linux 2.4.22-rc1 Marcelo Tosatti
2003-08-07 10:56 ` Erik Heinz
[not found] ` <20030819202629.GA4083@matchmail.com>
2003-08-19 21:09 ` md: bug in file raid5.c, line 540 was: " Mike Fedyk
2003-08-22 5:24 ` Neil Brown
2003-08-22 15:50 ` Lars Marowsky-Bree
2003-08-22 21:26 ` Mike Fedyk
2003-08-23 15:28 ` Lars Marowsky-Bree
2003-08-26 17:22 ` Mike Fedyk
2003-08-26 17:30 ` Lars Marowsky-Bree [this message]
2003-08-19 21:18 ` md: bug in file raid5.c, line 1909 " Mike Fedyk
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