Is true.  We just did a 3.7.2 to 3.7.4 upgrade, AIX 4.3.3.  Something has
changed in Tivoli's install script, and the device type changes from "tape"
to "ADSMtape", so that you have to delete the drives and add them back, but
rmdev -dl doesn't work, you have to use odmdelete.

I've also done 2.x to 3.x, 3.1.x to 3.7.x, and it's the first time I've run
into this.  But nevertheless, it's true.