From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: RAID6 fails to assemble after unclean shutdown Date: Wed, 25 Apr 2012 22:58:55 -0400 Message-ID: <4F98B9EF.40207@tmr.com> References: <20120425103536.GA9978@nsrc.org> <20120425210145.73b1e51b@notabene.brown> <20120425111606.GA10101@nsrc.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120425111606.GA10101@nsrc.org> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids Brian Candler wrote: > On Wed, Apr 25, 2012 at 09:01:45PM +1000, NeilBrown wrote: >> Presumably something when wrong during shutdown. However without more >> details (--examine) I cannot guess. > > OK, thank you. > > I've also found > https://raid.wiki.kernel.org/articles/r/a/i/RAID_Recovery_d376.html > which shows the --examine option too. > > When building the array, would you suggest I also specify --bitmap=internal, > so that there is less data to resync after an error? You are being very understated here ;-) Without a bitmap you can spend days getting back up instead of minutes. Brian has the true truth here, unless there is a reason to avoid it, a bitmap is a ticket to a sane rebuild. And if you have a big array, consider putting the bitmap on SSD, faster is better. -- Bill Davidsen "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot