Hello,

i am testing one the new bacula 7.x features:

*Migration/Copy/VirtualFull Performance Enhancements*

The Bacula Storage daemon now permits multiple jobs to simultaneously read the 
same disk Volume,
which gives substantial performance enhancements when running Migration, Copy, 
or VirtualFull jobs
that read disk Volumes. Our testing shows that when running multiple 
simultaneous jobs,
the jobs can finish up to ten times faster with this version of Bacula.
This is built-in to the Storage daemon, so it happens automatically and 
transparently .


i our setup we have 2 CopyDiskToTape which go into different pools on Tape 
storage.
our storage is a 2-drive autochanger device.

before the copy jobs are started, each drive has mounted a volume of the 
destination pools.

the problem is that both copy jobs only look at drive index 0
and premounted volumes are always swapped (mounted/unmounted) at drive 0.


we have a second bacula installation running 5.2.13
which has more or less the same setup and hardware.
on this installation parallel copy jobs runs can run without
swapping volumes on autochanger drive 0.
to overcome the exclusive read-lock limitation in this bacula version
we have defined two file storage devices which point to the
same location.  our sql selects the copy jobs in opposite order
for the two jobs,  so we can minimize the number of conflicts
when one file volume is already locked.


my question:

has there something changed in bacula 7.x how bacula determines
if a volume is already mounted for an autochanger device ?

why does bacula not use a premounted volume at drive index 1 ?


Best regards
Ulrich







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