On 05/05/2013 10:00 AM, Andreas Boman wrote:
On 05/03/2013 08:26 AM, Ole Tange wrote:
On Fri, May 3, 2013 at 1:23 PM, Andreas Boman<aboman@xxxxxxxxxxx>
wrote:
This morning I came up to see the array degraded with two missing
drives,
another failed during the rebuild.
I just started this page for dealing with situations like yours:
https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID
/Ole
After having ddrescue running all night, it dropped to copying at a
rate of 512B/s. I interrupted it and restarted, it stays at that
speed. shows no errors:
Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued: 557052 MB, errsize: 0 B, errors: 0
Current status
rescued: 1493 GB, errsize: 0 B, current rate: 512
B/s
ipos: 937316 MB, errors: 0, average rate: 16431
kB/s
opos: 937316 MB, time from last successful read:
0 s
Copying non-tried blocks...
However that is much too slow...
Then, I decided to take a look at the superblocks and to my horror
discovered this:
# mdadm --examine /dev/sd[b-g] >>raid.status
mdadm: No md superblock detected on /dev/sdb.
mdadm: No md superblock detected on /dev/sdc.
mdadm: No md superblock detected on /dev/sdd.
mdadm: No md superblock detected on /dev/sde.
mdadm: No md superblock detected on /dev/sdf.
mdadm: No md superblock detected on /dev/sdg.
Can I recover still? What is going on here?
Thanks,
Andreas
Turns out the superblocks are there. I ran --examine on the disk instead
of partition. OOps.
I still have the problem with ddrescue being very slow, it is running at
512 B/s pretty much no matter what options I use. The ddrescued disk
does NOT have a md superblock. I tried to ddrescue -i to skip and grab
the last 3MB or so of the disk, that seemed to work, but I still don't
have the superblock.
How do I find/recover the superblock from the original disk?
After that is done I'll try to get the array up with 4 disks, then add
the spare and have it rebuild. After that I'll add a disk to go to raid 6.
Thanks,
Andreas
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