Hi,
On 4/2/2007 6:02 PM, Naufal Zamir wrote:
> Hi everyone.
>
> I am using bacula version 1.38.5. Below are some of the results related
> to my backup. To the best of my knowledge, the congurartion on all the
> clients (Windows XP) is same. I have been unable to resolve the
> discrepencies in the result. If any one can please help me in this regard.
We will need much more information for this. I even suspect that, to
understand these problems, you'll have to find out a lot about your
network technology, and perhaps even file system internals.
Oh, and your lines were too long to qoute... doesn't matter, as I want
to comment on the headers first :-)
> Client
>
>
>
> Actual Data on disk(GB)
>
Measured how? The space used on your client, or Baculas volume files?
>
> #Hrs taken for backup
>
Concurrent jobs? Spooling? Network throughput? Disk throughput? That's
what you have to know. As a first step :-)
>
> Rate(KB/s)
>
Calculated how? Or is this what Bacula reports?
>
> FD bytes written(GB)
>
...
> Noted Discrepancies:
>
> * Why Does Bacula show lot more FD bytes written then actual Data?
Which actual data? Have you checked your fileset definitions using the
'estimate listing' command?
> Does this have to do anything with the backup speed, which I am
> getting? Similarly SD Bytes written are also nearly equal to FD
> bytes.
Part A: Unlikely. Part B: They should.
> * Client x.x.x.51 and x.x.x.48 have nearly equal data i.e. 8.8 GB
> and 8.77 GB, and they were backed up with nearly same speed, i.e.
> 404.1 KB/s and 404.9 KB/s, yet the time taken for each client is
> vastly different i.e. 18 hrs and 6 hrs respectively.
I don't know how Bacula handles wait times like waiting to despool,
waiting for volume mounts, etc.
> * For one of the client not mentioned in the table, there was
> problem with communication with the FD dameon. It took nearly 12
> hrs for bacula to go to next job after waiting. Is there any
> configuration I am missing about the wait parameter of some sort.
Yes... "FD Connect Timeout" for example. 12 hours is very long, and I
think it might help to know where the timeout occured - between DIR and
FD or FD and DIR?
> Any help will be appreciated.
The questions you have require lots of detail information to answer.
Generally, performance tuning Bacula is a really difficult think because
so many things happen in parallel (or should happen in parallel, for
best performance). Also, Baculas performance depends a lot on external
factors - network speed, disk and tape speed, client speed, catalog
database speed, job concurrency, and probably many others. If you want
to get better throughput you should first eliminate the most obvious
problems: Slow clients or network are best countered by spooling and
multiple concurrent jobs.
A slow catalog can be cured by moving it onto a faster machine.
Excessively long wait times for clients that are off are best countered
by run before scripts checking for the clients and parallel jobs.
Slow hardware (CPU, memory, disk and tape) are only cured by money :-)
Arno
>
> Thanks and Regards
>
>
>
>
>
>
>
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Arno Lehmann http://www.its-lehmann.de
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