> So do you believe these speeds of my backups are normal? I though my
> Library tape with LTO-5 tapes could write at 140 MB/s approx. It isn't
> possible to achieve higher speeds?

You need to speed up your source filesystem to achieve better
performance. Use raid10 or get a SSD. It has nothing at all to do with
your tape or bacula speed if you hard drive can not read what it needs
to backup at the maximum network speed. Or do not worry so much how
much time a single backup is taking and enable concurrency and
spooling. These will better utilize  the speed of your tape drive.


John

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