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 15:20:12 -0400 Message-ID: <50689B6C.8000307@ejane.org> References: 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: linux-raid@vger.kernel.org List-Id: linux-raid.ids 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 have >> lost access to my array. The array itself is a nine (9) disk raid6 >> managed 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 bug > 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 how 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 spares. I'm hesitant to re-create the array again (using mdadm) because according 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 from 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 problem? Thanks for all the responses, much appreciated. -EJ