Hi

Please let me know what does the following command return

crosscheck backup of database
completed between 'SYSDATE' and 'SYSDATE-30';

When you are deleting backups ensure that you dont use OS commands to do so.

For deleting expired backups of previous week type the following

RMAN>DELETE EXPIRED BACKUP COMPLETED BEFORE SYSDATE-7

and for deleting backups completed before 7 days type

RMAN>DELETE BACKUP COMPLETED BEFORE SYSDATE-7

Don't use the OS utilites to maintain the backups.

This message below
Infra as online but Degraded - IPMP Failure
has got nothing do with rman its something to Sun Cluster but i am not sure check with your solaris admin

regards
Hrishy