From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx2.redhat.com (mx2.redhat.com [10.255.15.25]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l5DKSJNF007635 for ; Wed, 13 Jun 2007 16:28:19 -0400 Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.241]) by mx2.redhat.com (8.13.1/8.13.1) with ESMTP id l5DKSHuX017761 for ; Wed, 13 Jun 2007 16:28:18 -0400 Received: by an-out-0708.google.com with SMTP id c31so84627ana for ; Wed, 13 Jun 2007 13:28:17 -0700 (PDT) Message-ID: <89f9efee0706131328r6db8c366u45f159de6d2aa9c9@mail.gmail.com> Date: Wed, 13 Jun 2007 16:28:16 -0400 From: "Leonard Smith" Subject: Re: [linux-lvm] LVM2 resync speed problems In-Reply-To: <4670415C.7020808@mattgillen.net> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <89f9efee0706121852rb00a21oab00877f4af43dfd@mail.gmail.com> <4670415C.7020808@mattgillen.net> Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Forgot to mention, the drives are WD 500 GB "Raid enabled" SATA drives. They are some of WD newer drives, and I think they are techincally SATA2. The other system also has the same drives. On 6/13/07, Matthew Gillen wrote: > Leonard Smith wrote: > > I am running CentOS4.4 on two "black" box systems that are > > identically configured. Both have 500 GB internal drives, ( same type) > > and were installed using the same kickstart configuration. The drives > > are being mirrored using LVM. > > > > When I check the first system it is re-syncing and the resync time and > > speed are > > > > finish=18559.6min speed=355K/sec > > > > On the second system the time and speed are > > > > finish=89.5min speed=68170K/sec > > > > I can't figure out why the speeds are different between the two. I > > checked /proc/sys/dev/raid/speed_limit_ and they are the same. The > > priority of the md proceses are they same. > > > > I tweaked the setting of the speel_limit_min and increase the nice > > priority of the resync process, on the first box, but I could never > > get it better than > > > > finish=4551.8min speed=1445K/sec > > > > > > I've googled and I haven't found much more useful information that to > > adjust those settings. Besides those setting what else dictates the > > speed used? > > You might compare the hd settings using 'hdparm'. I'm not sure factor of 100+ > can be explained by an incorrect DMA setting or something like that, but it > might be a contributor. > > Matt > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >