On Nov 4, 2008, at 3:07 AM, Craig TSM wrote:

If you have backed a file up the expiration date _cannot_ be changed
if
file is already deleted !!! even if you associate with another Policy
with different retentions

Understand, though, what the actual TSM handling is, to fully
appreciate what happens with stored objects.  Files don't have
expiration dates in the TSM database: they have instantiation
datestamps and deactivation datestamps.  The deactivation datestamp
plus the retention period determines the expiration date and time for
backup objects.  By increasing the policy retention time, you can
prevent expiration - but, of course, it applies to the stored objects
for all nodes and filespaces which bound files to that management
class and copy group.

  Richard Sims