From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Bitmap did not survive reboot Date: Wed, 11 Nov 2009 16:02:32 +0000 Message-ID: <4AFAE018.7040100@anonymous.org.uk> References: <20091111145233013.LCTM5263@cdptpa-omta04.mail.rr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20091111145233013.LCTM5263@cdptpa-omta04.mail.rr.com> Sender: linux-raid-owner@vger.kernel.org To: Leslie Rhorer Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 11/11/2009 14:52, Leslie Rhorer wrote: >> On 11/11/2009 08:53, Leslie Rhorer wrote: [...] >> risk of downtime anyway because your filesystem root is on a non-RAID >> device, but while you can (as I think you've said before) replace the >> boot disc quickly, you're exposing yourself to a long, slow resync which >> will increase your downtime by perhaps days... > > That presumes a loss of the boot drive *AND* one or two RAID drives. > That's pretty unlikely, unless something really nasty happens. I don't think it does - even if none of the RAID drives goes, the system crashing because of the root drive going AWOL might well leave the system with the RAID array marked "dirty" because it wasn't shut down cleanly, which without the bitmap would mean you'd get a full resync when you rebooted. Cheers, John.