The top speed I've achieved with an IBM 3581 L38 was around 30 MB/s on a test
(btest).
Have you tried a test of the raw tape speed? When I first got mt lto-2 library I did a few tests like the following
time dd if=/dev/sda of=/dev/nst0 bs=1G count=10
and I got around 35MB/s.
With my drive (LTO-2) which I believe is supposed backup at (20 to 40MB/s) I generally get around 21MB/s with bacula on most backups from a raid6 array on a remote system over a gigabit network with the database on a third machine and with MD5 signitures and medical image data that generally compresses around 1.3/1 to 1.5 /1
John
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