On 30 September 2012 20:20, EJ Vincent <ej@xxxxxxxxx> 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 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: >> >> <http://neil.brown.name/blog/20120615073245> >> > > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > 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? -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
