At 05:31 08/31/2007, Chris Howells wrote:
Hi,I am trying to figure out whether bacula supports multiplexing multiple simultaneous backup jobs to the same tape - having googled, the results are inconclusive :) I am currently playing with an LTO-4 tape drive which has a raw data transfer rate of 120MB/sec. Clearly any single machine is going to have difficulty in maxing out the drive. I'd therefore like to try running backups from multiple machines to the drive simultaneously.
Since tape is a linear medium, and not random-access, the only plausible way for what you suggest to work would be for Bacula to interleave data blocks from two or more backup jobs. At a minimum, this would require writing incredible amounts of data to the backend database to keep track of which blocks on a given tape belong to which portions of a given file from a given backup.
I very much doubt Bacula can do anything quite like that. You should probably spend more time looking into your network instead.
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