Hi,

12.01.2009 11:26, Ralf Brinkmann wrote:
> our onfiguration
> 
> - 2 DELL servers each with four AMD Quadcore CPUs.
> - Suse Linux 11.0 - Kernel 2.6.25
> - The servers are coupled over a fibre channel
>    by heartbeat
> - Dell PowerVault TL2000 Tape Library (LTO4)
>    attached over SAS to Server #2
> - Bacula release 2.4.2 Director is running on Server #2
> 
> 
> Backup via Ethernet (1GBit) from Server #1
> 
>    Scheduled time:         08-Jan-2009 21:05:00
>    Start time:             08-Jan-2009 21:06:52
>    End time:               08-Jan-2009 21:15:08
>    Elapsed time:           8 mins 16 secs
>    Priority:               10
>    FD Files Written:       35,606
>    SD Files Written:       35,606
>    FD Bytes Written:       13,569,315,322 (13.56 GB)
>    SD Bytes Written:       13,576,757,891 (13.57 GB)
>    Rate:                   27357.5 KB/s
> 
> Backup local on Server #2
> 
>    Scheduled time:         08-Jan-2009 21:05:00
>    Start time:             08-Jan-2009 21:15:10
>    End time:               08-Jan-2009 22:32:52
>    Elapsed time:           1 hour 17 mins 42 secs
>    Priority:               10
>    FD Files Written:       40
>    SD Files Written:       40
>    FD Bytes Written:       11,377,265,327 (11.37 GB)
>    SD Bytes Written:       11,377,270,876 (11.37 GB)
>    Rate:                   2440.4 KB/s

Given the number of files backed up, the second job is probably an 
incremental backup.

You're also seeing file system seek and stat times here, i.e. much of 
the time needed for the backup is spend examining files which are NOT 
backed up.

To compare backup speeds, run full backups only.

Arno

> The local backup on server #2 slows down any other network traffic to
> server #2 significantly.
> Switching on the Bacula job spooling feature did not help at all:
> 
>   Data-rate server #1 :19247.3 KB/s
>   Data-rate server #2 : 4527.4 KB/s
> 

-- 
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
www.its-lehmann.de

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