quota command and rsync snapshots...

[Eric Anderson]

On 11/15/06 14:39, Ensel Sharon wrote:
> I am currently afraid of UFS2 snapshots (maybe that's rational and maybe
> it's not ...) and so I am using Mike Rubel style rsync snapshots:
> 
> rm -rf day.3
> mv day.2 day.3
> mv day.1 day.2
> cp -al day.0 day.1
> rsync /source /destination/day.0
> 
> (note, GNU cp, the -al means copy everything with hard links)
> 
> You get the idea.
> 
> The question is, when I do a `du -ak` of each of the four days (day.0 -
> day.3) I get roughly the same number for all of them, which is to be
> expected.
> 
> However the output of `quota` for that user shows a _much_ larger number
> than the `du` for each of those directories.
> 
> I would think that `quota` would show me the sum of day.0 plus (all the
> total differences of day.1 - day.3) but it shows me a number _much_ larger
> than that.  I really can't even guess what the number it is showing me is.
> 
> So I have two questions:  given a directory that contains one current
> backup and three snapshots (day.0 - day.4) what command can I run that
> will show me the total _actual_ space used ?  du will not work because it
> counts up each directory as if it used all of that space...

Sure it does - you just need to specify either all the directories on 
the command line, or the top level of the directories.  It won't count 
hard links (assuming that is what you are talking about with the Mike 
Rubel comment) twice.

> Second, is there any way to get quota to show an accurate representation
> of the users usage ?


It should be accurate - can you send some sample output?

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
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