Recover data from disk with software RAID (FC6)

edortizq · 03-11-2009, 12:02 PM

I had an old server with FC6, one of the hard disks get damage and I'm trying to recover the mirrored data on the other disk; I could'n boot from the only good disk and couldn't see the disk installing it on other machine with SLES 10(I don't know how to mount a disk). Then I tried installing FC6 on the disk in the only partition wich was not mirrored, the swap partition wich had 2Gb; I can't see the data, only can see the raid partition using fdisk:

[root@localhost ~]# fdisk -l

Disk /dev/hda: 81.9 GB, 81964302336 bytes
255 heads, 63 sectors/track, 9964 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 9703 77939316 fd Linux raid autodetect
/dev/hda2 9704 9716 104422+ 83 Linux
/dev/hda3 9717 9964 1992060 83 Linux

Disk /dev/md0: 79.8 GB, 79809740800 bytes
2 heads, 4 sectors/track, 19484800 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md0 doesn't contain a valid partition table

WHAT CAN I DO TO RECOVER THE DATA FROM THE dev/hda1 PARTITION?????
AS YOU SUPOSSE NOW I'M REALLY NEW WITH LINUX, I NEED SOMETHING LIKE A STEP BY STEP GUIDE.
PLEASE YOUR HELP EXPERTS.

wsduvall · 03-12-2009, 07:50 AM

Hey,

First off, could you provide a little more information? It looks like your using a software RAID, is that right? What kind of RAID where you doing? It looks like you only have 2 disks, so I'm guessing RAID1? (Or am I getting 0 and 1 backwards again?).

For starters you might take a look at the post here: http://www.linuxquestions.org/questi...-mdadm-551732/ and this article here: http://www.linuxjournal.com/article/8874

edortizq · 03-13-2009, 11:04 AM

Yes, I was using a software RAID, the original wich comes with FC6.I had 2 disks, but one of them is not working any more, then I installed FC6 on the old swap partition (2Gb) and that's what is working now, the remain good disk, with FC6 installed on the old swap partition; the RAID partition shown with fdisk command was created with the previus installation wich had 2 disks.

Quote:

Originally Posted by wsduvall

Hey,

First off, could you provide a little more information? It looks like your using a software RAID, is that right? What kind of RAID where you doing? It looks like you only have 2 disks, so I'm guessing RAID1? (Or am I getting 0 and 1 backwards again?).

For starters you might take a look at the post here: http://www.linuxquestions.org/questi...-mdadm-551732/ and this article here: http://www.linuxjournal.com/article/8874

edortizq · 03-13-2009, 11:51 AM

That's what I get running mdadm, please help!!!

[root@localhost etc]# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Fri Jun 15 08:08:45 2007
Raid Level : raid1
Array Size : 77939200 (74.33 GiB 79.81 GB)
Device Size : 77939200 (74.33 GiB 79.81 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Thu Jan 8 17:27:17 2009
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

UUID : b5910933:f5f585a7:e551a662:f6e69360
Events : 0.589166

Number Major Minor RaidDevice State
0 0 0 0 removed
1 3 1 1 active sync /dev/hda1

Quote:

Originally Posted by wsduvall

Hey,

First off, could you provide a little more information? It looks like your using a software RAID, is that right? What kind of RAID where you doing? It looks like you only have 2 disks, so I'm guessing RAID1? (Or am I getting 0 and 1 backwards again?).

For starters you might take a look at the post here: http://www.linuxquestions.org/questi...-mdadm-551732/ and this article here: http://www.linuxjournal.com/article/8874

Dankles · 03-13-2009, 01:54 PM

try using the gparted live disk
then run:

Code:

mdadm --assemble -R /dev/md0 
OR maybe
mdadm --assemble -R /dev/md0 /dev/hda1
or
mdadm --assemble -R /dev/md0 /dev/hda1 /dev/hdb1

lol! one of those should work

Then just mount the drive:
mount /dev/md0 /your/dir