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smithj
Retired Dev
Joined: 24 Sep 2004
Posts: 111
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 Posted: Fri Jan 21, 2005 6:43 am Post subject: partition table (and/or filesystem) issue |
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first, let me say that this issue is entirely self-created, and is a product of only my carelessness
now, the issue:
i was installing gentoo on a laptop of a friend of mine's, and had transfered all his doze files onto another computer using rsync. i use knoppix for my gentoo installs. i had ssh'd into computer B (the comp with his files) from A (his laptop), and then had to go to class. in class, i realized that i should have given him a differing partition scheme, so i come back, do fdisk, then reboot. however, i did fdisk over ssh onto my server without realizing it! now, i have everything of MINE backed up, but his data is lost. i asked someone in my school what to do, and he told me to redo the partition table as it origionally was (i did not reformat, just fdisk). so i did that. but now when i try to mount or fsck, i get "bad superblock". the drive is/was ext3
any suggestions?
Last edited by smithj on Fri Jan 21, 2005 6:51 pm; edited 1 time in total |
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joeswift
Tux's lil' helper
Joined: 20 Jan 2005
Posts: 94
Location: South Africa
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| Posted: Fri Jan 21, 2005 8:17 am Post subject: |
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are you sure it's still an ext3 filesystem? maybe try mounting with ext2 flag like:
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mount -t ext2 [i]filesystem[/i]
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or maybe you don't have ext3 support built into the kernel. you might have it only as a module which wont work. If the filesystem is ext2 you can change it to ext3 by running tune2fs:
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tune2fs -j [i]filesystem[/i]
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Other than that, check your partitiona table again. You may have to repair it with e2fsck but check that out first before you do, otherwise it looks like you may have to format and lose your data... |
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codergeek42
Bodhisattva
Joined: 05 Apr 2004
Posts: 5142
Location: Anaheim, CA (USA)
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| Posted: Fri Jan 21, 2005 8:18 am Post subject: |
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ext3 should by default store backup superblock copies. Try running something like | Code: | | # e2fsck -b 8193 /dev/<partition> |
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smithj
Retired Dev
Joined: 24 Sep 2004
Posts: 111
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| Posted: Fri Jan 21, 2005 3:44 pm Post subject: |
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| codergeek42 wrote: | ext3 should by default store backup superblock copies. Try running something like | Code: | | # e2fsck -b 8193 /dev/<partition> |
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i tried that. it tells me that that superblock is borked as well
joeswift: i am running knoppix, which has support for all common file systems by default (DEFFY ext*). when i try "-t ext2" it tells me that there is not an ext2 filesystem.
edit: are there any programs designed for this type of thing? i know that some people (read US govt) can get data after it has even been formatted, so this shouldn't be SUCH a problem |
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Lion
Apprentice
Joined: 23 Jun 2002
Posts: 207
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| Posted: Fri Jan 21, 2005 3:56 pm Post subject: Try gpart |
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You could also try gpart (Guess Partition Table).
It does a nice job of recovering after an unforeseen fdisk. |
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smithj
Retired Dev
Joined: 24 Sep 2004
Posts: 111
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| Posted: Fri Jan 21, 2005 6:33 pm Post subject: |
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tried it. it gave me the correct partition table, but when i try to mount, it still tells me that there is a bad superblock or it is the wrong file system type
are there any utilities to recover slightly borked filesystems? (fsck doens't work) |
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Lion
Apprentice
Joined: 23 Jun 2002
Posts: 207
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| Posted: Sat Jan 22, 2005 11:42 am Post subject: |
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I don't know of any better utilities, but I have one more question.
Did you reboot after changing the partition table with fdisk?
If not, the the kernel may still use the previous (incorrect) partition table. |
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smithj
Retired Dev
Joined: 24 Sep 2004
Posts: 111
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| Posted: Sat Jan 22, 2005 8:53 pm Post subject: |
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| yes, i did reboot, because i didn't think about it |
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Kernel & Hardware
