On Thursday 25 June 2009 17:24:37 John Drescher wrote: > On Thu, Jun 25, 2009 at 10:23 AM, John Drescher<dresche...@gmail.com> wrote: > > On Thu, Jun 25, 2009 at 9:34 AM, terryc<ter...@woa.com.au> wrote: > >> Silver Salonen wrote: > >> > >>> As one device supports only one job, you have to create separate devices for > >>> each job you want to be able to run concurrently. > >> > >> That isn't how I understand it. I am working on having multiple clients > >> feeding files into a single tape drive at the same time and expect that > >> chuncks of each job will be interleaved along the tape. > >> > >> It should be the same for disk files, if that ishow you configure it > >> (say one file for each nights jobs). > >> > > > > As long as the pool is the same more than 1 job can concurrently write > > to the same volume. I have been doing that for years with tape and > > disk. However if you do want more than 1 pool then with disks its best > > to have multiple storage devices. > > > I should have said more than 1 pool to operate concurrently with disk. > > John M. Drescher
Yes, in this case we are about to ask ourselves what are pools - to my mind pools are collections of backup-files and policies about how to overwrite these files. Eg. if we want to do ordinary Grandfather-Father-Son rotation, we create 3 different pools for every job - for full, differential and incremental backups. And as we define them, we have to define separate devices for them too. Using only one pool with the whole backup-disk doesn't make sense to me, because managing these backups would be extremely limited, wouldn't it? PS. The limit to be able to write only one job to one disk-based device has been a bizzare limit that just complicates the configuration, I still don't understand why we have this limit in disk-based backups (the claim "Bacula uses disks as tapes" is just as bizzare). -- Silver ------------------------------------------------------------------------------ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
