Am Tue, 11 May 2010 03:47:05 -0700 schrieb martinofmoscow:

> Hi, we've come over from an Amanda backup system which had become a
> nightmare to administer, and generally we're very happy with Bacula.
> 
> My concern thought is speed: Bacula is proving to be very slow, possibly
> in relation - it seems - to its network utilisation. We're backing up
> over a managed 100Mbps LAN, so not lightning-fast, but ought to be ok
> for 400Gb overnight full weekly backup and typically 5Gb nightly
> differential. Although the methodology of Bacula and Amanda are
> different, I'm fairly certain Amanda was much, much faster at backing up
> over a network than could deal with this quite well. I kicked off a
> [400Gb, full] bacup at 1am on Saturday and it completed 11 hours later
> at mid-day.
> 
> Interestingly, I just noticed that the Bacula dir was able to reel off a
> backup of the fd on localhost of about 750Mb in under 10 seconds, which
> is why I'm looking towards the way Bacula uses the network as the
> possible source of the problem. Conversely, a differential of 6Mb from a
> client on the local LAN just took a few minutes to complete.
> 
> Another possibility is spooling. I've set up a spool directory on the
> director/sd but have never seen it used. Relatedly, the tape drive
> during backups is very stop/start, with a lot of pauses.
> 
> We're using an HP StorageWorks Ultrium 960 with LTO-3 tapes. The dir/sd
> is a PowerEdge running Ubuntu 8.04 LTS and the supported Bacula 2.2.8.
> The clients are running Ubuntu LTS and Redhat EL5 across a 100Mbps LAN.
> I am not using TLS encryption for these servers, although I will be
> using it soon for backing up two more servers across the internet.
> 


did you read:
http://www.bacula.org/en/dev-manual/Data_Spooling.html  and did you 
enable the SpoolData in the Job  definition?

the tape is likely faster than 100mbps resulting in starting/stoping alot 
(== slow)  if data-spooling is not configured correctly.


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