From: Ming Zhang <mingz@ele.uri.edu>
To: Lord Hess <Hess@certon.de>
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: AW: skip raid5 reconstruction
Date: Tue, 05 Jul 2005 15:32:07 -0400 [thread overview]
Message-ID: <1120591927.5535.65.camel@localhost.localdomain> (raw)
In-Reply-To: <1120585497.5535.60.camel@localhost.localdomain>
On Tue, 2005-07-05 at 13:44 -0400, Ming Zhang wrote:
> Thx.
>
> So it looks like mkraid might do this.
I tried mkraid and it works.
Thanks a lot!
Ming
>
> With this hint, I googled the --danferous-no-resync and try to do this
>
> # mdadm --create /dev/md1 --level=5 --assume-clean --raid-
> devices=4 /dev/sdf /dev/sdg /dev/sdh /dev/sdi
>
> But then i ran some io and use iostat to find that only 3 devices has io
> request and the parity disk has no disk activity at all. so this will be
> a skewed data for me.
>
> Ming
>
>
>
> On Tue, 2005-07-05 at 19:26 +0200, Lord Hess wrote:
> > kkraid -R --dangerous-no-resync /dev/md..
> >
> > Regards,
> >
> > Lord
> >
> > Certon systems GmbH
> > Hans-Bunte-Str. 8 - 10
> > 69123 Heidelberg
> > Tel: +49 6221 549810
> > Fax: +49 6221 549809
> > http://www.certon.de
> > mail to: hess@certon.de
> > -----Ursprüngliche Nachricht-----
> > Von: linux-raid-owner@vger.kernel.org
> > [mailto:linux-raid-owner@vger.kernel.org] Im Auftrag von Ming Zhang
> > Gesendet: Dienstag, 5. Juli 2005 19:23
> > An: Linux RAID
> > Betreff: skip raid5 reconstruction
> >
> > Hi folks
> >
> > I am testing some HW performance with raid5 with 2.4.x kenrel.
> >
> > It is really troublesome every time I create a raid5, wait 4 hours for
> > reconstruction, and then test some data and then recreate another one
> > and wait again. I wonder if there is any hack or option available to
> > create a raid5 without reconstruct the parity disk. I just have interest
> > to test the performance so do not care about data correctness at this
> > stage.
> >
> > Thanks!
> >
> >
> > Ming
> >
> >
> >
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
>
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prev parent reply other threads:[~2005-07-05 19:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20050705172915.1CB9D2F88D@mail.kip.uni-heidelberg.de>
2005-07-05 17:44 ` AW: skip raid5 reconstruction Ming Zhang
2005-07-05 19:32 ` Ming Zhang [this message]
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