> What kind of backup throughput are people seeing?
> 
> I'm backing up Linux clients to a Linux server across a Gb network to
> local disk (hardware RAID 5) on the backup server and rarely see
> speeds above 8MB/s.  What kinds of performance tweaks are available?
> Is it all about tuning IO on the client or can Bacula be tweaked?
> 
> Thanks!
> 
> -Ben

1) Writes to a RAID-5 array slow down the more drives you have.  For 
most things like use as a file share performance is still great so long 
as you've got the writes cached, but for sustained writing the cache 
will fill up before the writes complete and you wind up being at the 
mercy of the platter speeds.  For a write to a RAID-5 set of 5 drives, 
it has to do reads as well as writes on all the drives in the set. 
That's why some people do RAID-1 and RAID-10 for projects like high 
performance backup to disk, this but of course that's more expensive.

2) The more simultaneous backups you have going at the same time, the 
slower it will be too.

Depending on your config... that might be all you could expect.
The rotational speed and interface of the drives matters as well as the 
speed of the computers being backed up--desktops with a single sata 
7,200 rpm sata drive won't be very quick.  That's where concurrency 
helps, but as I mentioned above, if you get too many writers at the same 
time you'll reduce performance of all of them.

    Bob

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users