> -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of fibreraid@xxxxxxxxx > Sent: Monday, May 02, 2011 1:17 PM > To: linux-raid > Subject: 6-drive RAID 10 failed, cannot reactivate, need help > > Hi All, > > I have an Ubuntu Hardy 64-bit system with mdadm 2.6.9. > > I have a 6-drive RAID 10 named md1. Unfortunately, there was some > power outage and when the system came back up, it showed 2 drives as > failed and 4 as active. I removed the two failed drives from the array > using -r, and then added them back in using --add and --force. The Ooh, that's bad. > array will not rebuild though. It simply shows now these two drives as > spares. > > I doubt the data is actually lost since it was a sudden outage. What > can I do from here to get mdadm to activate this array and kick off > rebuild if needed? I'm really stuck. Thanks in advance for any help. First of all, I heartily suggest you copy at least the failed drives and if possible all 6 drives to spare hard drives using dd_rescue. After that, you are going to need to re-create the array. Make sure all the parameters are the same as the original, including superb;ock, chunk size, bitmap, and position within the array. Essentially, allowing for any differences in drive position and any growth or re-shaping of the array, you need to re-issue the same command originally issued to create the array, except use the --assume-clean switch so md won't try to re-sync. Mount the file system ready-only and attempt to read it. If it fails, stop the array, determine which element is incorrect, and try again. -- 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
