Chg-Rait: Writing to one half of a mirror

[Dennis Benndorf]

Hello,

at the weekend I was facing the problem, that one of our robot had a 
problem with its grappler (arm). Because of this amanda refused writing 
to the mirror.
I saw something with tapedev definition where you can set one half to 
ERROR, also I did try to use "null:" in changer definition but the last 
thing failed because amanda moaned about "null:" has no function 
"inventory".

My Question is now: What do I have to do to get amanda writing to one 
half of it?

Regards,
Dennis