With regards to functionality, both of schedmodes are equivalent. But there
are some arguments in different environments which prefers any of these
modes.

Schedmode pooling is better for example for clients, which are not up
allways at their backup the time. Server then didn't try to get them and
initialize backup, but client himself start action, if it is running - you
can avoid the server messages like "Session open failed due to connection
refusal" ... and other.

Pooling mode is also better for environment with hundreds of clients (like
yours I think), because lowers the server load. In prompting mode are all
scheduled actions in server regie otherwise to pooling mode. On the other
hand, one of disadvantages of pooling mode is time synchronization of server
and clients which you have to control to reach consolidated backup
environment

My opinion.
Hi Tom

Tomas Hrouda, AGCOM Smirice
Tivoli Certified Consultant
Storage Manager Specialist
hrouda AT agcom DOT cz
+420 49 5941312, +420 604 296521
ICQ#77892561