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Old 10-02-2006, 01:17 PM   #1
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Unhappy Restoring a software raid

Distro: Fedora 4 core
Kernel: 2.6

My primary harddrive recently died upon me. I was uploading files to it via ftp when it suddently stopped. I logged in via ssh and every command (eg. ls, less, umount) gave an "input/output error". I had no other choice than to unplug the power. The harddrive had died.

I got a new hd and installed Fedora 4 again and updated it with yum. Now on the old install I had a software raid (RAID 0) on two USB disks (yes, I know, don't tell me...) I have moved this array from one installation to another before, no issues. But now.. I have made the same raidtab file as I had before, but when trying to "mkraid /dev/md0" I get the following error:

handling MD device /dev/md0
analyzing super-block
disk 0: /dev/sdb1, 58605088kB, raid superblock at 58604992kB
/dev/sdc1 appears to be already part of a raid array -- use -f to
force the destruction of the old superblock
mkraid: aborted.

Now how do I get around this with out destroying the data that is on the disk?

I have bought a new 300GB disk to replace the RAID, but I _really_ need the data on the RAID.. What to do?

My raidtab looks like this:

raiddev /dev/md0
raid-level 0
nr-raid-disks 2
nr-spare-disks 0
chunk-size 4
persistent-superblock 1
device /dev/sdb1
raid-disk 0
device /dev/sdc1
raid-disk 1

I have thought about dding the two RAID disks onto two new disks (identical to the original ones), so I have an extra set of disks to mess with, but does dd keep the correct partition table?
Old 10-02-2006, 01:55 PM   #2
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lsraid gives the following:

lsraid -A -a /dev/md0
[dev 9, 0] /dev/md0 21620865.469FADF0.8BF97700.26FCBF8A online
[dev 8, 16] /dev/sdb 21620865.469FADF0.8BF97700.26FCBF8A good
[dev 8, 32] /dev/sdc 21620865.469FADF0.8BF97700.26FCBF8A good


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