Parrallelization of RMAN Full Database Backup Confusion

Question

Hi,
I am running Oracle 10gR2 on Solaris 5.10 on sparc machine having 16 CPUs.
I am using following RMAN script to take full database backup:
#!/bin/bash
ORACLE_HOME=/u01/app/oracle/product/10g
PATH=$ORACLE_HOME/bin:$PATH
ORACLE_SID=mtcedwp
export ORACLE_HOME ORACLE_SID PATH
rman target / <<EOF
run
CONFIGURE RETENTION POLICY TO REDUNDANCY 1;
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 8;
CONFIGURE CONTROLFILE AUTOBACKUP ON;
ALLOCATE CHANNEL d1 DEVICE TYPE DISK;
ALLOCATE CHANNEL d2 DEVICE TYPE DISK;
ALLOCATE CHANNEL d3 DEVICE TYPE DISK;
ALLOCATE CHANNEL d4 DEVICE TYPE DISK;
ALLOCATE CHANNEL d5 DEVICE TYPE DISK;
ALLOCATE CHANNEL d6 DEVICE TYPE DISK;
ALLOCATE CHANNEL d7 DEVICE TYPE DISK;
ALLOCATE CHANNEL d8 DEVICE TYPE DISK;
BACKUP TAG ATHEER_FULL_DB DATABASE FORMAT '/u01/BACKUPS/WEEKLY_DB_BACKUP/backup_%U';
CROSSCHECK BACKUPSET;
CROSSCHECK BACKUP;
DELETE NOPROMPT OBSOLETE;
RELEASE CHANNEL d1;
RELEASE CHANNEL d2;
RELEASE CHANNEL d3;
RELEASE CHANNEL d4;
RELEASE CHANNEL d5;
RELEASE CHANNEL d6;
RELEASE CHANNEL d7;
RELEASE CHANNEL d8;
EOFWill the above script take the 8-way parrallel backup? or do I need to configure location for every channel separately?
regards

Answer 1

This channel can be allocated manually or can be pre-configured by using
automatic channel allocation.
The number of allocated channels determines the maximum degree of
parallelism that is used during backup restore or recovery. For example if
you allocate 8 channels for a backup operation 8 background processes for the
operation can run concurrently.
Parallelism of backup sets allocates multiple channels and assigns
files to specific channels. You can configure parallel backups by setting a
PARALLELISM option of the CONFIGURE command to a value greater than 1 or by
manually allocating multiple channels.
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmconc1.htm#i1012864