On 05/03/2013 02:53 PM, Josh Fisher wrote: > > On 5/3/2013 1:37 PM, Dimitri Maziuk wrote:
>> Ideally one should be able to specify multiple Device's in the Storage >> and have bacula write to them in turn until all get full. A couple of >> extra "for" loops and another list is basically all it takes to support >> that, so I'm slightly surprised it's not there already. > > Well, I think it is quite a bit more complicated than that. Bacula is > designed with a tape paradigm. With tape drives, the device doesn't > change. but rather another volume is swapped into the same device. It's the 'single tape' paradigm. I've a couple of 10yo (I think) qualstar jukeboxes here with 12 tape slots and 2 drive slots in each. (Although we never added the 2nd drive to either of them.) So, > Bacula does device assignment one time when the job is started. The > reason is because Bacula is multi-threaded and it is the simplest way to > avoid race conditions caused by device contention. What you are > considering would require a new device assignment each time a new volume > is needed. While possible, it is way more complex that it appears at > first glance. Fair enough. So what happens when a new volume is needed and there's no room on the current device? -- this is the point where you'd switch to the next device in the list and try again until you run out of devices. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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