Zitat von bdelagree <bacula-forum AT backupcentral DOT com>:

> This post follows one of my old posts (see :  
> http://www.backupcentral.com/phpBB2/two-way-mirrors-of-external-mailing-lists-3/bacula-25/slow-backup-how-to-optimize-122683/index-15.html)
>
> My backups are still long .
> After listening to the network and servers I think my problem comes  
> from the database.
> After much research some say migrate from MySQL to PostgreSQL .
>
> Before doing so I need your opinion , is there a real added value?

You should first check how long it actually takes to insert the  
attributes in the database. With this information you can decide if  
you are optimizing the right point. For example our biggest job has  
around 1.1TB with 4 mio files which grow to around 1.2G attributes per  
job according to the logs. This job finish within around 32 hours but  
inserting the attributes only takes ~3 minutes. We have additional  
overhead per file and overall throughput because using encryption and  
Windows isn't that fast either.

So what is the time it takes to insert the attributes?
What is the transfer speed you get?
Do you use data/attribute spooling as you should?
What is the transfer speed to tape (LTO-5)?

Without carefully measuring this values no one could say if you got a  
real value from switching to PostgreSQL.

Regards

Andreas





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