On Wed, 7 Oct 2009, Philip Jocks wrote:

I had a file /usr/.snap/dump_snapshot being about 15GB in size, which I removed because the partition was filling up.
The file's date was always rather current, so I'm wondering, what it was for?
I did do a level 0 dump with -0 and -Lau parameters a few weeks ago and always do dumps on other boxes, but never saw a file in the .snap directory growing. For the other partitions, there are no such files, that's why I'm wondering.
Maybe someone can shed some light on this for me.


man -P 'less +/-L' dump

explains it a bit. The snapshot file is supposed to go away after dump completes, but in your case dump died or was killed before it unlinked the file.

On small filesystems, -L is quick enough to not make a noticeable difference. /usr can be huge, and there's a long pause while it makes that snapshot and doesn't seem to be doing anything useful.

-Warren Block * Rapid City, South Dakota USA
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