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Dimitri,
I have heard the same complaint from you a number of times: "Bacula sucks at disk as tapes". It is my view that your statement is simply not true. Bacula handles tapes, disk, fifo, cloud, aligned volumes, deduplication, and many other device types. The original code was largely monolithic with tests that did different things depending on the device. However, for quite some time now Bacula has been split into separate drivers for each device type, which means that it is not at all correct to say that Bacula treats tapes and disk the same. They are both handled very differently including the device addressing -- that is each device has very different ways of tracking device addresses and the OS APIs that it uses to address those devices. You can keep thinking as you wish, but it worries me that your (what I consider incorrect) concept of Bacula drivers may confuse other users. There are certain common factors between each of the end devices mentioned above that Bacula handles, but even a cursory look at the source code for Bacula 9.0.x will prove that the details of the device are handled very differently. Best regards, Kern On 21/08/2017 19:27, Dimitri Maziuk wrote: On 08/21/2017 11:49 AM, Phil Stracchino wrote:I can immediately cite one practical *disadvantage*: you're going to be doing a fandango on disk. With 500 volumes open, you may well spend more time seeking than actually writing.Well, I'd also want to look at the elevator scheduler and the actual hardware too...The problem as I see it, is bacula sucks at "disks as tapes". It doesn't work without vchanger, and it can't auto-label volumes in the vchanger. (Inability to write two copies at once to guard against disk failure is icing on the cake.) If you back up to a single filesystem, you can spool jobs in parallel to fast drive and have them despooling to volumes sequentially to spinning rust with very little practical speed penalty. Provided your disk subsystem is faster than the network, of course. Adding one volume per job/client constraint and $(JobId) to volume label shouldn't be too hard. If you want to use removable drives as "magazines" with one drive per client... I'd be tempted to take a close look at BackupPC or some such before I'd commit to bacula.
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