From mboxrd@z Thu Jan 1 00:00:00 1970 From: EJ Vincent Subject: Re: Upgrade from Ubuntu 10.04 to 12.04 broken raid6. Date: Sun, 30 Sep 2012 15:25:15 -0400 Message-ID: <50689C9B.1010603@ejane.org> References: <50689B6C.8000307@ejane.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 9/30/2012 3:22 PM, Mathias Bur=C3=A9n wrote: > On 30 September 2012 20:20, EJ Vincent wrote: >> On 9/30/2012 6:04 AM, Mikael Abrahamsson wrote: >>> On Sun, 30 Sep 2012, EJ wrote: >>> >>>> Fast forward to now, I've upgraded the system to 12.04 LTS and hav= e lost >>>> access to my array. The array itself is a nine (9) disk raid6 mana= ged by >>>> mdadm. >>> >>> What version of kernel for 12.04 were you running? >>> >>> If you didn't upgrade your kernel, you might have been hit by the b= ug >>> described in: >>> >>> >>> >> Hello, >> >> I'm running the stock version of Ubuntu 12.04.0, using kernel >> 3.2.0-23-generic. >> >> That link looks interesting-- I'm not sure if I triggered the bug ho= w Mr. >> Neil Brown describes it, but I definitely have symptoms on some (not= all) >> the disks of RAID level "-unknown-" and devices appearing to be spar= es. >> >> I'm hesitant to re-create the array again (using mdadm) because acco= rding to >> that blog post, for RAID-6, the order of devices are important, and = with >> this being a 9 disk array and no record of device order in logs or f= rom my >> own memory, I have no idea what the proper order might be. >> >> I do know that 1) I was using metadata version 1.2, 2) the array was= not >> degraded and subsequently 3) no disks were missing. >> >> Am I over-estimating the importance of the order and should proceed = with the >> re-creation, or perhaps wait for Neil himself to weigh in the proble= m? >> >> Thanks for all the responses, much appreciated. >> >> -EJ >> >> -- >> 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 > Can't you just boot off an older Ubuntu USB, install mdadm and scan / > assemble, see the device order? Hi Mathias, I'm under the impression that damage to the metadata has already been=20 done by 12.04, making a recovery from an older version of Ubuntu=20 (10.04), impossible. Is this line of thinking, flawed? Thanks, -EJ -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html