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ruizs
n00b
Joined: 14 Jul 2004
Posts: 18
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 Posted: Tue Nov 15, 2005 6:45 am Post subject: Lost main system drive, need to re-create raid array |
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Hi all -
well, I lost the main drive for my gentoo install a while back - gentoo and all programs were installed on /dev/hda, and I had all my data stored on a raid 5 array, consisting of /dev/sda1, sdb1, and sdc1.
I have since replaced the main drive, and re-installed gentoo (using the latest genkernel, everything seems to be working nicely).
I want to get my data back (no, I NEED to get my data back), but I lost all my raid config info... I've tried mdadm --assemble, but there's nothing in my config file. Can I scan my devices to create a new config? I don't remember all the options I had before.
looks like the array is still there, at least minus one disk:
| Code: | stewie sbin # lsraid -d /dev/sda1
[dev 9, 0] /dev/md/0 9DEDC71E.251BF51A.DAF00A01.E64A360E offline
[dev 8, 1] /dev/sda1 9DEDC71E.251BF51A.DAF00A01.E64A360E good
[dev 8, 17] /dev/sdb1 9DEDC71E.251BF51A.DAF00A01.E64A360E good
[dev ?, ?] (unknown) 00000000.00000000.00000000.00000000 missing |
So how do i get this thing back? I already created a /dev/md0, lsmod shows raid5, md_mod, xor modules loaded. Nothing really in /proc/mdstat.
HELP!!  |
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ruizs
n00b
Joined: 14 Jul 2004
Posts: 18
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| Posted: Tue Nov 15, 2005 11:13 pm Post subject: |
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| anyone? I'm having data withdrawls |
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ruizs
n00b
Joined: 14 Jul 2004
Posts: 18
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| Posted: Wed Nov 16, 2005 4:41 pm Post subject: |
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Yay! I got it going. FYI, for anyone w/ the same issues:
Getting the raid array going:
| Code: | stewie proc # mknod /dev/md0 b 9 0
stewie proc # ls -l /dev/md0
brw-r--r-- 1 root root 9, 0 Nov 15 21:15 /dev/md0
stewie proc # mdadm -A /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
mdadm: /dev/md0 has been started with 2 drives (out of 3). |
Finding / Mounting the volumes (lvm):
| Code: | 109 vgexport raid5
110 pvscan
111 vgimport raid5
112 vgchange -ay raid5
113 mkdir -p /mnt/raid5/data
114 mount /dev/raid5/volData /mnt/raid5/data |
(my lvm volume group name is raid5, sorry for the confusion) |
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