How to configure two separate channels

Question

Hi all,
I'm working with a two nodes RAC using 9.2.0.8 Enterprise edition.
I want to configure the archivelog backup:
CONFIGURE CHANNEL 1 DEVICE TYPE 'SBT_TAPE' CONNECT 'rman_intranet/oracleto@DBCIAT01' PARMS 'ENV=(TDPO_OPTFILE=/home/adsmadm/rman_DBCIAT01/opt/tdpo.opt)';
CONFIGURE CHANNEL 2 DEVICE TYPE 'SBT_TAPE' CONNECT 'rman_intranet/oracleto@DBCIAT03' PARMS 'ENV=(TDPO_OPTFILE=/home/adsmadm/rman_DBCIAT03/opt/tdpo.opt)';
RMAN> run {
2> sql 'alter system switch logfile';
3> sql 'alter system archive log current';
4> sql 'alter system archive log current';
5> backup format 'brman_arch_%s' archivelog all;
6> }
But fails with this error
channel ORA_DISK_1: sid=27 devtype=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 01/14/2013 12:49:55
RMAN-06059: expected archived log not found, lost of archived log compromises recoverability
ORA-19625: error identifying file /logs/bbdd/oracle/DBCIAT03/archiver/T0001S0000004618.ARC
ORA-27037: unable to obtain file status
IBM AIX RISC System/6000 Error: 2: No such file or directory
The error is because can't found the archivelog of second node on the first node.
backup format 'brman_arch_%s'
(archivelog like '/logs/bbdd/oracle/DBCIAT01/archiver/%' channel 1 delete all input )
(archivelog like '/logs/bbdd/oracle/DBCIAT03/archiver/%' channel 2 delete all input )
but fails too with this other error:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01005: syntax error: found "integer": expecting one of: "channel_id, double-quoted-string, identifier, single-quoted-string"
RMAN-01007: at line 3 column 66 file: standard input
Please, any idea?
best regards

Answer 1

THis is just an example..
RMAN can allocate channels to instances it is connected to. For a RAC database, you can connect to the grid TNS alias, which points to all instances. You can then set up parallelism for the device type, and the load will be spread across the RAC instances.
You need to make sure that the password file exists for each instance, and that the user you're connecting as from RMAN has sysdba privileges.
Example:
tnsnames.ora entry:
RACDATABASE =
(DESCRIPTION =
(ADDRESS_LIST =
(LOAD_BALANCE = yes)
(FAILOVER = on)
(ADDRESS = (PROTOCOL = TCP)(HOST = racnode1)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = racnode2)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = racnode3)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORCL)
RMAN connect:
rman target username/password@RACDATABASE
(username/password is for a user with SYSDBA privileges).
RMAN channel configuration:
CONFIGURE DEVICE TYPE DISK BACKUP TYPE TO COMPRESSED BACKUPSET PARALLELISM 4;
This sets up the channels to be spread across the instances based on instance load.