From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: Re: skip raid5 reconstruction Date: Fri, 08 Jul 2005 08:22:46 -0400 Message-ID: <1120825366.5461.14.camel@localhost.localdomain> References: <1120584167.5535.56.camel@localhost.localdomain> <42CB7E65.5010204@wasp.net.au> Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <42CB7E65.5010204@wasp.net.au> Sender: linux-raid-owner@vger.kernel.org To: Brad Campbell Cc: Linux RAID List-Id: linux-raid.ids On Wed, 2005-07-06 at 10:47 +0400, Brad Campbell wrote: > Ming Zhang wrote: > > 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. > > I did a similar thing a while back. > I created the raid and waited for it to sync, I then make dd copies of the raid superblocks. > When I blew it up I just dd the clean superblocks back again (saved a 12 hour rebuild time) interesting to know about this. u just check the dmesg and see where is the sb and then u dd it out and dd back later? > > Having just thought about what you wrote, I guess you are building the raid in different > configurationes each time, so my method might not be good for you. > yes, i changed it many times. thx anyway! Ming > Regards, > Brad