From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Starting RAID 5 Date: Mon, 18 May 2009 11:13:17 -0400 Message-ID: <4A117B0D.5040804@tmr.com> References: <20090515021521914.KSFT13751@cdptpa-omta01.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: Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: lrhorer@satx.rr.com, 'Linux RAID' List-Id: linux-raid.ids NeilBrown wrote: > On Fri, May 15, 2009 12:15 pm, Leslie Rhorer wrote: > >> OK, I've torn down the LVM backup arraqy and am rebuilding it as a RAID 5. >> I've had problems with this before, and I'm having them, again. I created >> the array with: >> >> mdadm --create /dev/md0 --raid-devices=7 --metadata=1.2 --chunk=256 >> --level=5 /dev/sd[a-g] >> >> whereupon it creates the array and then immediately removes /dev/sdg and >> makes it a spare. I think I may have read where this is normal behavior. >> > > Correct. Maybe you read it in the mdadm man page. > > > While I know about that, I have never understood why that was desirable, or even acceptable, behavior. The array sits half created doing nothing until the system tries to use the array, at which time it's slow because it's finally getting around to actually getting the array into some sensible state. Is there some benefit to wasting time so the array can be slow when needed? >> I can't get it to do an initial resync or promote the spare, however. >> > > So it doesn't start recovery straight away? That is odd... > Maybe it is in read-auto mode. I should probably get mdadm to poke > it out of that. > > If it is just start creating the filesystem or whatever you want to > do, that will prod it into action. > > If not (check /proc/mdstat), what kernel log messages are them from the > time when you created the array. > > NeilBrown > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- bill davidsen CTO TMR Associates, Inc "You are disgraced professional losers. And by the way, give us our money back." - Representative Earl Pomeroy, Democrat of North Dakota on the A.I.G. executives who were paid bonuses after a federal bailout.