Removing disk backups after implementing Veritas tape backups

Question

I was using RMAN with a catalog to backup to disk. Now we implemented RMAN backups using Veritas tape backup using the same catalog and I want to remove the old disk backups.
When I "crosscheck backup" and "crosscheck archivelog all" then "delete obsolete" it errored with the following:
==================================================================
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of delete command at 08/29/2005 13:53:39
RMAN-06091: no channel allocated for maintenance (of an appropriate type)
================================================================
I assume it is seeing one of the tape backups and wants to detete it.
How can I clearout these unnecessary disk backup sets without causing any problems?
Thank You,
.....Kevin

Answer 1

I found the solution:
RMAN> crosscheck backup;
RMAN> crosscheck archivelog all;
RMAN> delete obsolete device type disk;
-- Assuming redundency was 1 only one set is left in the disk directory...
RMAN> list backup;
-- Find the backup set key which lists the DISK backups.
-- List all the BSKeys
RMAN> delete backupset key1, key2, ..., keyn;
-- The files are gone...