On Thu, Feb 18, 2010 at 07:51:13AM -0700, Mike Bydalek wrote:
> Recently I've started using BackupPC to backup my file server and am
> seeing some things that just don't quite make much sense.  Lately
> backups have been taking quite some time, in fact the current one
> started on 2/16 @ 11pm and is still running.  I do have a lot of data,
> around 330G, but not a whole lot changes on a daily basis.
> 
> Here are my latest backups with the times:
> 
> Compression performance for files already in the pool and newly
> compressed files.
>       Existing Files  New Files
> Backup#       Type    Comp Level      Size/MB         Comp/MB         Comp    
> Size/MB         Comp/MB         Comp
> 0     full    3       78446.6         45871.8         41.5%   258032.2        
> 155715.6        39.7%
> 2     incr    3       276482.0        165123.8        40.3%   143.0   70.3    
> 50.8%
> 3     incr    3       900.7   530.7   41.1%   964.7   469.5   51.3%
> 4     incr    3       113.5   2.7     97.6%   218.0   30.8    85.9%
> 5     incr    3       73.4    6.1     91.7%   194.8   32.2    83.5%
> 6     incr    3       304.3   172.2   43.4%   1735.9  944.0   45.6%
> 7     incr    3       275955.3        165019.1        40.2%   1337.0  658.0   
> 50.8%
> 8     incr    3       520.4   249.4   52.1%   672.7   282.5   58.0%
> 9     incr    3       502.9   243.5   51.6%   587.6   264.1   55.1%
> 10    incr    3       116.8   3.7     96.8%   201.5   24.3    88.0%
> 11    incr    3       14.0    3.0     78.7%   244.3   32.8    86.6%
> 12    incr    3       127.1   5.3     95.9%   82.2    22.3    72.8%
> 13    incr    3       276989.9        165643.4        40.2%   329.3   40.7    
> 87.7%
> 14    incr    3       275957.9        165146.0        40.2%   1503.5  615.1   
> 59.1%
> 
> My question is, why did backups 13 and 14 backup all that data?  Same
> with 2 and 7 for that matter.

What level are your incremental backups? if backup 2 was at level 1
and backup 7 was at level 1 (you use levels 1 2 3 4 5 6) and backup 13
is back at level 1 that's kind of what I would expect since level 1
backs up everything since since the last full.

However 14 should be quite a bit less unelss it was also a level 1.
 
> Below is my config.  I'm still messing with the IncrLevels and have a
> super short period just to get some increments and all that going.
 [...]
> $Conf{IncrLevels} = [
>   '1',
>   '2',
>   '3',
>   '4',
>   '5',
>   '6'
> ];

-- 
                                -- rouilj

John Rouillard       System Administrator
Renesys Corporation  603-244-9084 (cell)  603-643-9300 x 111

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