Thanks for all who responded yesterday, however...
Last night I noted another anomaly while trying to figure out why it was hanging at 96% on buffered backup.
LDEV 1 had zero sectors permanent space left!
Hmmmmmm, maybe THAT's a bigger problem?
(Could I attribute it to the RR buffer? I thought that was supposed to be a Temporary file, so I wonder why the Perm space gets used up?)