Hi,

On Mon, Jul 6, 2009 at 23:57, Les Mikesell<lesmikesell AT gmail DOT com> wrote:
> The only thing that seems slightly strange in the graphs is the load average
> going to 12 as the backups start and staying there a couple of hours. 
>  Normally
> that's the average number of 'other' processes that are waiting for CPU but
> otherwise runnable (i.e. not themselves blocked on i/o).

I used to think that, but in fact processes that are blocked in disk
i/o (the ones in "D" state) do count in load average. So the load
average of 12 in this case probably means processes writing to the
disk.

>>From another e-mail showing several (12?) processes BackupPC_dump and
BackupPC_nightly in "D" state, those should be the reason why this box
stays with a load average of 12 during the night.

>>From those observations, it seems to me that the bottleneck in this
case is disk I/O.

Stephen, it seems strange to me that there are 8 BackupPC_nightly
processes running, have you increased $Conf{MaxBackupPCNightlyJobs}
from 2 to 8?

I would suggest you start by setting $Conf{MaxBackupPCNightlyJobs}
back to 2 or even to 1. If you set it to 1 and it can't finish its job
in 24h, then increase $Conf{BackupPCNightlyPeriod} to 2 or 4 so that
only 1/2 or 1/4 of the pool is processed each night.

HTH,
Filipe

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