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Old 12-19-2004, 01:02 PM   #1
adelezz
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Registered: Dec 2004
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Raid 0 error


i have a computer that has linux kernel 2.4 and 3 hard disks, two of them are setupped as RAID0
unfortunately the mother board failed and i had to change it with another mother board, same brand but different model..
when i tried to boot the linux system, i had a RAID error
/dev/mdo: Invalid argument

plz i need help ASAP, i need the data on the hard disk

thank you very much for your help
 
Old 12-19-2004, 02:03 PM   #2
pcunix
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RAID 0 really isn't RAID (because there's no redundancy). It's just striping of drives to make one bigger space. Unfortunately, the implementation makes recovery very difficult in the case of a hardware failure: when files are written, a chunk goes to drive one, the next chunk goes to the other drive, then the next is back to the first again, so if you lose one drive, you've lost big, big chunks of your files - or even entire files when they are small.

If the drives are still readable at all, you might try the suggestions at http://www.linuxforum.com/forums/ind...owtopic=118619
http://www.spinics.net/lists/raid/msg06475.html

Is it at all possible that you just hooked up drives wrong when you changed the MB? I've sure done dumb things like that.. worth double checking, trading cables, etc. Maybe you got the drives backwards so that what was the first of the pair is now the second? That would make the raid unreadable.

If you get it back, consider NOT doing this again. Drives are so big and so cheap now there's just no reason to put yourself at risk like this. Mirroring or RAID 5 (assuming your write load is low) is the way to go. and I like LVM on top: http://aplawrence.com/Linux/lvm.html

See http://aplawrence.com/Unixart/raid.html for an explanation of RAID levels.


--
Tony Lawrence
http://aplawrence.com
 
  


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