quota command and rsync snapshots...

[Brooks Davis]

On Wed, Nov 15, 2006 at 04:23:42PM -0500, Ensel Sharon wrote:
> 
> >> 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?
> 
> 
> Ok, here is what I see (6.1-RELEASE) :
> 
> First, the output of the quota command for that user:
> 
> # quota sammy
> Disk quotas for user sammy (uid 1002):
>      Filesystem   usage   quota   limit   grace   files   quota   limit
>      /mnt/big1 197067392 500000000 600000000   1554116 50000000 60000000
> 
> So, quota is saying 197 GB used, ~1.5 mil. files.
> 
> Now looking at the users home directory itself, I see:
> 
> du -ak /home/sammy | tail -1
> 197067392
> 
> (ok, agrees with quota)
> 
> find /home/sammy | wc -l
> 5007486
> 
> (5 million ... ?)
> 
> Now inside of the home directory:
> 
> day.0 day.1 day.2 day.3
> 
> All four of these dirs are size 130 GB (give or take - small differences
> based on deletions day to day)
> 
> All four of these dirs have ~1.25 (?) million files in them.
> 
> Remember, only day.0 is "real" - the others are `cp -al` copies,
> consisting almost totally of hard links back to day.0.
> 
> 
> So I really don't know what is going on.  quota says 1.5 mil. files, I
> have 5 million total "files", each dir does not exceed 140 GB.

quota only counts inodes so the hard links are only counted once.

> Does this mean that there is (197 minus 140) GB of churn per day, and that
> there must be (1.5 mil. minus 1.25 mil.) churn of file turnover per day
> ? Or something like that ?  That is the only thing i can think of ...

It means that files totaling 57GB are modified over three days.
Depending on your work load that may or not be reasonable.  Remember
that a 1 byte will cause the whole file to count toward the total.

-- Brooks
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