RMAN Scripts to Create Backup Pieces to Multiple Disk LOcations and delete obsolete

In order to take backup of datafiles and archivelogs to more than one locations below scripts can be used:

run {
ALLOCATE CHANNEL disk1 DEVICE TYPE DISK FORMAT '/data01/oradata/RMAN_BACKUP/LOC1/%U';
ALLOCATE CHANNEL disk2 DEVICE TYPE DISK FORMAT '/data02/oradata/RMAN_BACKUP/LOC2/%U';
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/data02/oradata/RMAN_BACKUP/LOC2/%F';
backup incremental level 0 database;
release channel disk1;
release channel disk2;

sql 'alter system archive log current';
ALLOCATE CHANNEL disk1 DEVICE TYPE DISK FORMAT '/data01/oradata/RMAN_BACKUP/LOC1/LOG_%t_%s_%p_%U';
ALLOCATE CHANNEL disk2 DEVICE TYPE DISK FORMAT '/data02/oradata/RMAN_BACKUP/LOC2/LOG_%t_%s_%p_%U';
backup archivelog all DELETE INPUT;
release channel disk1;
release channel disk2;

CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK CLEAR;
}


We have faced below error while "delete obsolete":

RMAN> delete obsolete
RMAN-06091: no channel allocated for maintenance (of an appropriate type)

Problem was, I was trying to delete backups, which are on both disk and tape, so we need to allocate proper channel tape/disk:

Tape:
run {
allocate channel 'dev_0' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so';
crosscheck backupset;
delete obsolete;
}

run {
allocate channel 'dev_0' type 'sbt_tape'
parms 'SBT_LIBRARY=/opt/omni/lib/libob2oracle8_64bit.so';
crosscheck backupset;
delete noprompt backup of archivelog until time 'sysdate-7';
}


Disk:

run {
allocate channel 'dev_0' type disk;
crosscheck backupset;
delete obsolete;
}

run {
allocate channel 'dev_0' type disk;
crosscheck backupset;
delete noprompt backup of archivelog until time 'sysdate-7';
}