tape_34xx.aaef3e <bus ID of the tape device>: A tape unit was detached while in use
Explanation
A tape unit has been detached from the I/O configuration while a tape
was being accessed. This typically results in I/O error messages and
potentially in damaged data on the tape.
User response
Check the output of the application that accesses the tape device.
If this problem occurred during a write-type operation, consider repeating
the operation after bringing the tape device back online.