From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: Software RAID (non-preempt) server blocking question. (2.6.20.4) Date: Fri, 30 Mar 2007 14:38:48 +1000 Message-ID: <17932.37976.65001.735686@notabene.brown> References: <17931.23488.160031.119117@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Justin Piszcz on Thursday March 29 Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org List-Id: linux-raid.ids On Thursday March 29, jpiszcz@lucidpixels.com wrote: > > > > > Did you look at "cat /proc/mdstat" ?? What sort of speed was the check > > running at? > Around 44MB/s. > > I do use the following optimization, perhaps a bad idea if I want other > processes to 'stay alive'? > > echo "Setting minimum resync speed to 200MB/s..." > echo "This improves the resync speed from 2.1MB/s to 44MB/s" > echo 200000 > /sys/block/md0/md/sync_speed_min > echo 200000 > /sys/block/md1/md/sync_speed_min > echo 200000 > /sys/block/md2/md/sync_speed_min > echo 200000 > /sys/block/md3/md/sync_speed_min > echo 200000 > /sys/block/md4/md/sync_speed_min > Yes, well.... You told it to use up to 200MB/s and the drives are only delivering 44MB/s, so they will be taking nearly all of the available bandwidth. You shouldn't be too surprised if other things suffer. NeilBrown