Re: [Bacula-users] Concurrent spooling and despooling

Hi,

16.02.2010 11:50, Daniel Kamm wrote:
> That's maybe a stupid question, but I really wonder...
> 
> Using Disk Spooling prior to write data to tape, heads in a sequential 
> write order:
> a) write data from backup client to disk spool directory
> b) write data from spool directory to tape
> 
> Why are those tasks done sequentially?

I know those three reasons:
- simultaneously spooling and despooling increases the requirements of 
your spool space storage system even more
- it's never been implemented
- it's probably harder to implement than it looks at first.

> Let's say if the spool is reaching a waterlevel mark, the storage daemon 
> will start to write the spool data to tape _and_ at the same time the 
> backup client still sends data to the spool directory. Isn't that possible?

It's not possible now, but IIRC this has been discussed quite often, 
but, while many users thought it might be a nice feature, nobody 
started actually working on it.

There's actually a feature request regarding that, though it isn't on 
the web site yet. It is, though still unnumbered, in the projects file 
of the git tree.

Cheers,

Arno

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

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Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW
http://p.sf.net/sfu/solaris-dev2dev
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