From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Poor write performance with write-intent bitmap? Date: Thu, 23 Apr 2009 08:48:10 +0100 Message-ID: <49F01D3A.8050209@anonymous.org.uk> References: <49ED096E.1000002@anonymous.org.uk> <49ED16F7.3040906@anonymous.org.uk> <4081b80da35818efbc07723240f8ea36.squirrel@neil.brown.name> <49ED2BC3.7050109@anonymous.org.uk> <87d4b5m4kf.fsf@frosties.localdomain> <49EF108D.4070605@anonymous.org.uk> <87skk0947d.fsf@frosties.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <87skk0947d.fsf@frosties.localdomain> Sender: linux-raid-owner@vger.kernel.org To: Goswin von Brederlow Cc: Linux RAID List-Id: linux-raid.ids On 22/04/2009 15:02, Goswin von Brederlow wrote: > John Robinson writes: >> Another issue might be the LVM layer; does that need to be stopped or >> switched to read-only too? > > Debian does > > /sbin/vgchange -aln --ignorelockingfailure || return 2 > > before S60mdadm-raid, S60umountroot and S90reboot. But that's not going to switch any VG with a still-mounted filesystem (e.g. /) to read-only or make it go away, it's going to fail. Still probably a good idea for other circumstances, though. > I've been using a 1GB / for years and years now so that won't be a > problem. As for the rest one can also bind mount /usr, /var, /home to > /mnt/space/* respectively. I.e. have just 2 (/ and everything else) > partitions. Well, I have just 2, /boot and everything else, but I might in the future switch to your suggestion. > Esspecially for XEN hosts I find LVM verry usefull. Makes it easy to > create new logical volumes for new xen domains. My thoughts exactly :-) Many thanks, John.