Am I correct that there is still (even in V5.3) no method to move all data
from one copypool to another ?

I have a need to move all copypool data from a 3590 pool to an LTO2 pool !

IIRC, unless things have changed, the only choice I have is to re-backup
the primary pool to the new copypool and then manually "delete volume ...
discarddata=yes" for the 300+ volumes in the old copypool !

Please tell me there is an alternative !