Could be potential hardware issue, I can see you are using non-persistent names for tape drives....so please check if drive name has got changed ?
Read/Write open error usually comes when software has problem communicating with the hardware, and there can be n number of reasons behind it(Drive requires cleaning,drive name got changes if not using persistent names etc)
Will suggest you to configure persistent naming for drive to avoid getting into this situation because of name change.
bingo.1
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Posted October 31st, 2017 04:00
Inspect your hardware - it might be that a tape will not be ejected far enough so the the gripper can catch it.
As a consequence, the tape drive will report an ejected cartridge. Howerver, the drive is still (partially) loaded.
Usual solution: re-insert the tape into the drive and retry the eject/unmount operation.