John - The joy of inherited environments, where you have no solid information on how things were configured by your predecessors...
In my experience, an ANR8469E unload failure is always due to a tape drive hardware problem (possibly a sensor or motor problem). Check your records or logs to gauge whether one or two drives are troublemakers and need work. A tape stuck in a drive tends to stay in the drive, where it subsequently being put away in a strange place *might* be due to human actions. Sometimes, a seeming unload failure can be a timing problem in the drive microcode, where not enough time is being allowed for the operation. See IBM Technotes (1143428, 1212674) on the possible causes of ANR8356E. An insidious problem is where the barcode is inconsistent with the magnetic labeling of the volume. Element number inconsistencies are another gem. Beyond that, I would activate TapeAlert and review AIX Error Log entries. You also say that you are doing library sharing, so I would review the logs of both sharers and see if both are experiencing the same kind of problems, which may illuminate configuration or software issues. what I can think of, Richard Sims
