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Linux Tutorial :: View topic - LINUX swap and recovery from swap
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LINUX swap and recovery from swap

 
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koen
Beginner


Joined: Sep 12, 2005
Posts: 224
Location: Belgium

PostPosted: Thu Dec 13, 2007 7:02 pm    Post subject: Reply with quote

the first quote in the OP is indeed wrong - swap and buffering are completely different things, and temp files are files on disk and have nothing to do with either swap or buffers.

On the other hand, i can image that if something gets buffered in memory, then that memory is swapped to disk, and you then might find traces of it after a crash. To call that a 'handy failsafe' is nonsense.

You can actually read your swap : find out the device name of the swap partition, and use cat, eg
[code:1]cat /dev/hda4[/code:1]
you'll find some text strings here and there, but no files, and lots of gibberish.
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koen
Beginner


Joined: Sep 12, 2005
Posts: 224
Location: Belgium

PostPosted: Fri Dec 14, 2007 6:10 pm    Post subject: Reply with quote

well, theoretically, your openoffice file may end up in swap when the memory where it's loaded is swapped to the disk, and you me be able to recover parts of its contents from your swap partition.

But really, try it. Read your swap, it will give you an idea of just how hard it's going to be to find anything in there, on the odd change it got swapped in the first place. Cause, when you're actively using that file, it has to be loaded to memory again (and its space in swap may get overwritten if an other program needs to swap out to make space in RAM ...)

I think that occasionally hitting "save" is a lot easier to learn than figuring out how to use swap space as a recovery strategy.
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