On Nov 30, 2015, at 12:18 PM, Alan Brown <a...@mssl.ucl.ac.uk> wrote: > >> On 30/11/15 16:57, Christoph Litauer wrote: >> Hi Alan, >> >> maybe this is an important hint … >> I thought btape doesn't use a disk at all. Instead it uses on-the-fly >> generation of test data … does it? > > If it does, that could easily be your bottleneck. /dev/random isn't > normally very fast. > >> If btape uses the configured spool directory I have to take a look at that >> point. > > For LTO, the Spool disk MUST be at least least one SSD, preferably a > stripe of them on as fast a controller as you can afford. Standard disks > simply can't keep up with tape drives.
I had not considered that. In my case, I backup to local HDD (ZFS array) for long term storage. Right after those jobs finish, I copy to tape. Sounds like I need to implement spooling now. Fortunately, my full backups are only about 400GB. I think I can get away with one SSD feeding my LTO-4. ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
