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Backup Oracle DB using TSM server version 6.3.0

I'm new to Oracle and TSM server. I installed Oracle11gR2 and TSM server version 6.3.0 (linux Centos 6.4 OS). I did the configuration and everything works fine. so far I arrive to run the following script using rman:

run {
allocate channel Channel1 type 'SBT_TAPE' parms
'ENV=(DSMO_NODE=TDPOTSMUSR,DSMO_AVG_SIZE=1,TDPO_OPTFILE=/opt/tivoli/tsm/client/oracle/bin64/
tdpo.opt,DSMI_LOG=/opt/tivoli/tsm/client/api/bin64/logs)';
backup
        full
        format 'b_%u_%p_%c'
        database;
release channel Channel1 ;
}

I need to know how to backup theOracle DB to a storagepool name ORADisk? I need to understand a bit what does channel mean in a script and what does it actually do. really appreciate your hel and reply. thank you