Hello,
2012/12/7 Stieneke, Dan <dan.stien...@ars.usda.gov>
> Reading the mail archive, it seems I’m not alone in wanting to see
> concurrent spooling/despooling.
>
>
>
> Could we hand off the job to a standalone spooler like mbuffer (
> http://www.maier-komor.de/mbuffer.html)? For a simple tar to LTO-4 job it
> makes a tremendous improvement.
>
>
>
The main problem with concurrent spooling/despolling in Bacula Storage
Daemon is not a buffer/fifo (which is already implemented because we have a
spooling functionality already) but single job thread. It is not easy to
implement concurrency with a current code. In this case mbuffer does not
simplify things.
> The Bacuala developers would need to modify the storage daemon to allow
> the datastream to be diverted out and then back in through a pair of FIFOs
> before it gets [properly re-blocked? and] written to tape.
>
Simply speaking developers have to implement a multiple threads for single
job which write data to tape. This is a main missing code for build in
concurrent spooling/despooling. :)
The user would need to tie the FIFOs together with an external spooler. It
> might look like this:
>
>
>
> ------/etc/bacula-sd.conf------
>
> <snip>
>
> Device {
>
> …
>
> PushToFIFOSpooler = /path/to/bufreceive # bufreceive is a FIFO on
> this machine
>
First thread to read data from client and write data to the buffer -
implemented already.
> PullFromFIFOSpooler = /path/to/bufsend # bufsend is also a FIFO
>
Second thread to read data from buffer and write to bacula device - missing.
best regards
--
Radosław Korzeniewski
rados...@korzeniewski.net
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