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stefan_2000
n00b
Joined: 06 Oct 2007
Posts: 9
Location: łódź
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 Posted: Sun Nov 16, 2008 12:50 pm Post subject: How to recover (undelete) file from JFS filesystem? |
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Hi,
is there any possibility to undelete file on JFS filesystem? JFS is journal, so there should be a way to roll-back but how?
Aany help would be appreciated  |
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timeBandit
Bodhisattva
Joined: 31 Dec 2004
Posts: 2719
Location: here, there or in transit
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| Posted: Sun Nov 16, 2008 4:08 pm Post subject: Re: How to recover (undelete) file from JFS filesystem? |
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| stefan_2000 wrote: | | JFS is journal, so there should be a way to roll-back but how? |
No, that's not the purpose of a filesystem journal. The journal records metadata changes to facilitate quick recovery of huge filesystems after an improper shutdown. Uncommitted transactions are replayed during recovery to restore the filesystem to a consistent state.
While it is technically true that you could roll back an uncommitted transaction (if the necessary tools existed), in practice it may only be a matter of seconds or minutes before the transaction is committed, depending on system load. Once committed, a transaction cannot be rolled back.
If another process is still using the deleted file, recovery is trivial. If not, you are probably out of luck. Googling for "undelete JFS" yields many hits but the most promising appear to be for commercial, Windows-only recovery tools.
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Plants are pithy, brooks tend to babble--I'm content to lie between them.
Super-short f.g.o checklist: Search first, strip comments, mark solved, help others. |
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NeddySeagoon
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Joined: 05 Jul 2003
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| Posted: Sun Nov 16, 2008 4:28 pm Post subject: |
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stefan_2000,
Is this thread any help /
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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stefan_2000
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Joined: 06 Oct 2007
Posts: 9
Location: łódź
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| Posted: Mon Nov 17, 2008 6:35 pm Post subject: |
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Thanks for answers.
=> timeBandit
Trick with files in use looks nice, but won't work for me.
=> NeddySeagoon
My partition table is fine, that's not the problem.
I've spent hours looking for tool that can recover files, "Nucleus Kernel JFS" was able to recover some files, but not all. I give up.
Once again, thanks for help. |
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