From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: Re: AW: skip raid5 reconstruction Date: Tue, 05 Jul 2005 13:44:57 -0400 Message-ID: <1120585497.5535.60.camel@localhost.localdomain> References: <20050705172915.1CB9D2F88D@mail.kip.uni-heidelberg.de> Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20050705172915.1CB9D2F88D@mail.kip.uni-heidelberg.de> Sender: linux-raid-owner@vger.kernel.org To: Lord Hess Cc: Linux RAID List-Id: linux-raid.ids Thx. So it looks like mkraid might do this. With this hint, I googled the --danferous-no-resync and try to do this # mdadm --create /dev/md1 --level=3D5 --assume-clean --raid- devices=3D4 /dev/sdf /dev/sdg /dev/sdh /dev/sdi But then i ran some io and use iostat to find that only 3 devices has i= o request and the parity disk has no disk activity at all. so this will b= e 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.. >=20 > Regards, >=20 > Lord >=20 > 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 > -----Urspr=C3=BCngliche 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 >=20 > Hi folks >=20 > I am testing some HW performance with raid5 with 2.4.x kenrel. >=20 > It is really troublesome every time I create a raid5, wait 4 hours fo= r > 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 inter= est > to test the performance so do not care about data correctness at this > stage. >=20 > Thanks! >=20 >=20 > Ming >=20 >=20 >=20 >=20 > - > 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 >=20 - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html