Has anyone noticed when doing a restore from tape it almost grinds down
to a halt when another process/session requests the same tape?

We had this happen when an impatient client decided to run 2 restores, where
the data on the 2nd restore was on the same tape. The restore slowed from
5MB/s to 30kB/s. When I killed the 2nd restore session it speed up.

Similarly, later that evening, the system decided to migrate data to that
same volume and it did the same thing.

Bug/feature?

Cheers, Suad
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