On Tue, Feb 5, 2013 at 10:03 AM, Sorin Srbu <sorin.srbu AT orgfarm.uu DOT se> 
wrote:
>>
> A quick additional note, the drives on the client seem to be pretty fast, even
> compared to the raid0 array...
>
> user@BPC-client ~/ [0]#  hdparm -tT /dev/sd[ab]
>
> /dev/sda:
>  Timing cached reads:   10832 MB in  2.00 seconds = 5416.82 MB/sec
>  Timing buffered disk reads:  208 MB in  3.02 seconds =  68.77 MB/sec
>
> /dev/sdb:
>  Timing cached reads:   11108 MB in  2.00 seconds = 5554.84 MB/sec
>  Timing buffered disk reads:  254 MB in  3.00 seconds =  84.54 MB/sec

You are testing sustained transfer times there.  The killer with small
files is the seek time while the disk head bounces around reading
little bits of directory and inode data.    And once you get started,
the server has to do approximately the same to check for matches -
possibly with other backups running.

-- 
   Les Mikesell
     lesmikesell AT gmail DOT com

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