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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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 Posted: Mon Jan 24, 2011 4:10 pm Post subject: Did mdadm --create rather than --assemble |
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Hi,
I have an existing array of three hard disks which form a RAID0 array which have ext3 on them.
I accidently did an: mdadm --create command to create a new array rather than --assemble.
I can't seem to mount the /dev/md0 array as it says "mount: wrong fs type, bad option, bad superblock on /dev/md0".
What is wrong? Have I just lost all my data  ?
Thanks. |
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richard.scott
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Joined: 19 May 2003
Posts: 1497
Location: Oxfordshire, UK
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| Posted: Mon Jan 24, 2011 4:28 pm Post subject: |
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Hi,
I'm sorry to say that chances are you've just wiped your data.
Try stopping the md0 and re-creating it with the correct options.
It's a slim chance, but may help.
Rich. |
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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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| Posted: Mon Jan 24, 2011 4:33 pm Post subject: |
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| richard.scott wrote: | Hi,
I'm sorry to say that chances are you've just wiped your data.
Try stopping the md0 and re-creating it with the correct options.
It's a slim chance, but may help.
Rich. |
I just tried that but the same error occurs with mount. The UUID of the three disks is now reported as being different from blkid.
I simply can't accept that it was that easy to lose all my data. There was no warning given or anything..
If this is then my faith in mdadm is shot. |
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richard.scott
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Joined: 19 May 2003
Posts: 1497
Location: Oxfordshire, UK
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| Posted: Mon Jan 24, 2011 4:43 pm Post subject: |
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| eponymous wrote: | I simply can't accept that it was that easy to lose all my data. There was no warning given or anything..
If this is then my faith in mdadm is shot. |
It does ask if your sure like this:
| Code: | # mdadm --create /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 -n 4 -l 6
mdadm: /dev/sda1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
Continue creating array? |
At that point if you accidentially say Y then you loose your data.
Rich |
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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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| Posted: Mon Jan 24, 2011 4:47 pm Post subject: |
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| richard.scott wrote: | | eponymous wrote: | I simply can't accept that it was that easy to lose all my data. There was no warning given or anything..
If this is then my faith in mdadm is shot. |
It does ask if your sure like this:
| Code: | # mdadm --create /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 -n 4 -l 6
mdadm: /dev/sda1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdb1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdc1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
mdadm: /dev/sdd1 appears to be part of a raid array:
level=raid5 devices=4 ctime=Thu Dec 23 22:13:32 2010
Continue creating array? |
At that point if you accidentially say Y then you loose your data.
Rich |
I think i'm going to throw up
Surely there is some way for me to rebuild this? Please god. |
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eponymous
Tux's lil' helper
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Posts: 141
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richard.scott
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Joined: 19 May 2003
Posts: 1497
Location: Oxfordshire, UK
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| Posted: Mon Jan 24, 2011 4:53 pm Post subject: |
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have you upgraded mdadm since you created the array?
Perhaps its defaults are now different? |
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eponymous
Tux's lil' helper
Joined: 02 Feb 2005
Posts: 141
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| Posted: Mon Jan 24, 2011 5:08 pm Post subject: |
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| richard.scott wrote: | have you upgraded mdadm since you created the array?
Perhaps its defaults are now different? |
I have upgraded yes - this is what led me down this path in the first place. I did w world update then did an etc-update. I was careful not to overwrite my /etc/mdadm.conf file.
I then restarted and got loads of errors about the RAID stuff.
It also seems to default and create /dev/md127 /dev/md127p1 /dev/md126 /dev/md126p1 :s |
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