Les Mikesell wrote:
> Matthias Meyer wrote:
>   
>> Assumed I have 10 hosts and the maximum number of simultaneous backups to
>> run is 5.
>> Further assumed all 10 hosts have to make a backup today.
>> 4 of them have theire last backup made 2 days ago and 3 of them yesterday.
>> 2 have a partial backup and 1 have no backup.
>> 9 hosts are reachable (ping) the last times but 1 host not. Therefore the
>> BlackoutPeriods for 9 hosts can be applied by backuppc and for 1 host not.
>> Nevertheless the time now is not within this blackout period.
>>
>> Which 5 hosts will request theire backups?
>>
>> Will BackupPC try the hosts in alphabetical order?
>> Or will BackupPC use informations about the oldest backup and try this hosts
>> at first?
>>     
>
> The first cut will be which ones have reached their backup interval 
> (since the last backup) at each wakeup time.  That is, at each wakeup it 
> will consider only the set that is not within a blackout and has passed 
> the interval time since it's last run - and these will not start if the 
> ping test fails.  I'm not sure who wins if there are more choices at one 
> time than your concurrency limit allows - it might just be the order in 
> the host list.  I just start one early from the web interface if I want 
> to push it ahead.
>   

 From the source (/usr/local/BackupPC/bin/BackupPC on my machine)...

#
# Compare function for host sort.  Hosts with errors go first,
# sorted with the oldest errors first.  The remaining hosts
# are sorted so that those with the oldest backups go first.
#
sub HostSortCompare
{
    #
    # Hosts with errors go before hosts without errors
    #
    return -1 if ( $Status{$a}{error} ne "" && $Status{$b}{error} eq "" );

    #
    # Hosts with no errors go after hosts with errors
    #

    return  1 if ( $Status{$a}{error} eq "" && $Status{$b}{error} ne "" );

    #
    # hosts with the older last good backups sort earlier
    #
    my $r = $Status{$a}{lastGoodBackupTime} <=> 
$Status{$b}{lastGoodBackupTime};
    return $r if ( $r );

    #
    # Finally, just sort based on host name
    #
    return $a cmp $b;
}

Chris



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