On 10/12/10 04:53, Stephen Carr wrote:
> Dear All
> 
> I need advice regarding having several storage daemons that share the 
> MySQL database and discs (using NFS) but one storage daemon manages the 
> tape unit.

The storage daemons do not use MySQL directly; only the Director does.
Having two storage daemons writing to the same set of disks is not
inherently a problem, as long as they are never trying to write the same
volume at the same time, but will be likely to result in high levels of
seek activity, and thus may actually hurt performance.

> All backups go to disc but the Full backups are migrated to tape overnight.
> 
> The reason for asking this question is that we backup 60 laptops during 
> the working week between 9 am and 4 pm with 12 having a full backup on 
> one of the week days. The problem is the network is saturated and some 
> clients are slow and others have large amounts of data. (Applications 
> etc are not backed up only user data).
> 
> I suspect the NFS and MySQL traffic may negate any gain by having extra 
> storage daemons.

As noted above, in this configuration you may not necessarily be even
gaining anything from the multiple storage daemons.  If backing up your
clients is already saturating your network, adding additional NFS
traffic into the problem can't possibly help.

> Another option is to see if bonding two network adapters may work.

You could try bonding, or faster network equipment, or a secondary
network dedicated to backup traffic.  But somehow, if your backup load
is saturating your network, the only real way out of the problem is to
increase the speed of your network.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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         Renaissance Man, Unix ronin, Perl hacker, Free Stater
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