On Wed, Nov 26, 2008 at 07:18:11AM -0500, tmassey AT obscorp DOT com wrote:

> > Is there some way to determine approximately how many clients (or how 
> > much data) can be backup up with backuppc?
> 
> Via EPIA EN 1.2GHz processor, 512MB RAM, single 750GB PATA hard drive 
> backs up 4 different servers, with a total data storage of ~600GB:  2 x 
> ~250GB servers, the remaining servers with less than 50GB between them. 
> Full backups weekly, incrementals daily.  Oh, and this is over 100Mbit.
> 
> Everybody freaks out about the amount of RAM: they tell me I need more for 
> better speed.  However, I've watched vmstat throughout the process and the 
> swap BI/BO remains at 0.

Have you looked at the wait column (last one) in vmstat? How many files
per server do you have? I've got over 2 million files in the pool. If
your server is swapping, you _need_ more RAM. If it is not, more RAM
will still serve as a disk cache, e.g. for filesystem structure and
metadata and helps a lot to reduce I/O wait times.

Bye,

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.lichtkreis-chemnitz.de
www.craniosacralzentrum.de

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