Rao, Uthra R. (GSFC-672.0)[ADNET SYSTEMS INC] wrote (2016/05/25):
> I have a Qualstar Tape library (RLS-87120) with three LTO7 tape drives.
> It is connected to the backup server directly through Fiber Channel.
> I am  running bacula 7.4.  I ran a test backup which completed
> successfully but I found that the LTO-7 Tape was not used up to
> its full capacity of 6TB. It wrote 2.6TB and marked the tape "FULL"
> then moved on to the next tape in the pool. I expected the backup to
> write 6TB to the tape before marking it "FULL"? Here is the information
> from my bacula-sd.conf:

Do you really have LTO-7 tape media in LTO-7 tape drive? It looks like
only LTO-6 tape media in LTO-7 tape drive. Or, you have to have sustained
data rate atleast 100 MB/s, so tape drive can avoid backhitching. In
another case, when you are not unable to feed your tape drive atleast
100 MB/s, then backhitching does occur and full tape capacity could
not be used.

-- 
Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 2, 612 66  Brno, Czech Republic

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