Oops, I meant to say the error I get when trying to mount /srv is this: root@dtla:~# mount /srv mount: /dev/mapper/vg_raid10-srv: can't read superblock Aren't there other copies of the superblock? I'm not sure how it works with LVM. On Mon, Sep 22, 2014 at 10:17 AM, Ian Young <ian@xxxxxxxxxxxxxxx> wrote: > I forced the three good disks and the one that was behind by two events to > assemble: > > mdadm --assemble --force /dev/md0 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sde2 > > Then I added the other two disks and let it sync overnight: > > mdadm --add --force /dev/md0 /dev/sdd2 > mdadm --add --force /dev/md0 /dev/sdf2 > > I rebooted the system in recovery mode and the root filesystem is back! > However, / is read-only and my /srv partition, which is the largest and has > most of my data, can't mount. When I try to examine the array, it says "no > md superblock detected on /dev/md0." On top of the software RAID, I have > four logical volumes. Here is the full LVM configuration: > > http://pastebin.com/gzdZq5DL > > How do I recover the superblock? > > On Sun, Sep 21, 2014 at 10:47 PM, NeilBrown <neilb@xxxxxxx> wrote: >> >> On Sun, 21 Sep 2014 22:32:19 -0700 Ian Young <ian@xxxxxxxxxxxxxxx> wrote: >> >> > My 6-drive software RAID 10 array failed. The individual drives >> > failed one at a time over the past few months but it's been an >> > extremely busy summer and I didn't have the free time to RMA the >> > drives and rebuild the array. Now I'm wishing I had acted sooner >> > because three of the drives are marked as removed and the array >> > doesn't have enough mirrors to start. I followed the recovery >> > instructions at raid.wiki.kernel.org and, before making things any >> > worse, saved the status using mdadm --examine and consulted this >> > mailing list. Here's the status: >> > >> > http://pastebin.com/KkV8e8Gq >> > >> > I can see that the event counts on sdd2 and sdf2 are significantly far >> > behind, so we can consider that data too old. sdc2 is only behind by >> > two events, so any data loss there should be minimal. If I can make >> > the array start with sd[abce]2 I think that will be enough to mount >> > the filesystem, back up my data, and start replacing drives. How do I >> > do that? >> >> Use the "--force" option with "--assemble". >> >> NeilBrown > > -- 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
