From mboxrd@z Thu Jan 1 00:00:00 1970 From: Piergiorgio Sartor Subject: Re: RAID-10 unbalanced reads Date: Tue, 24 Feb 2009 20:16:04 +0100 Message-ID: <20090224191604.GA3470@lazy.lzy> References: <20090209202728.GA11996@lazy.lzy> <20090209231138.GB13450@rap.rap.dk> <20090223221532.GA23542@lazy.lzy> <20090223225202.GA28505@rap.rap.dk> <20090223232415.GA24493@lazy.lzy> <20090224090034.GA8051@rap.rap.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20090224090034.GA8051@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Cc: Piergiorgio Sartor , linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi, > The boot partition is most likely a raid1 partition, which is quite yep, it is. > Depends on how you measure things. It could be that sdb2 has delivered > some blocks that md1 did not use, and thus did not register as read. OK, good to know. > Are these numbers taken like just after a boot? No, after some usage. And this makes me doubt of myself. Maybe I started something which was causing this. > Activity on /boot indicates this. You seldomly use /boot after booting. > If so, it is a bit interesting that you have about 1/3 of the IO done in > writing. Why is there so much wroting? I thought that booting was > almost only reading. I think /boot was OK, it is on /dev/sd[ab]1, not so many writes. > > The only thing that *could* do something on the > > raw devices is "smartd", I cannot think anything > > else. Maybe I will disable it, for now... > > I think that would be a good idea for your testing. I'll try to enable/disable "special" services and see. If I can reproduce clearly the issue, I'll come back. Hope not... Thanks again for your support, bye, -- piergiorgio