RMAN Script for database backup on RAC

run {
allocate channel ch01 device type disk format 'rac_level0_%U.bak' connect 'sys/123@rac1';
allocate channel ch02  device type disk format 'rac_level0_%U.bak' connect 'sys/123@rac2';
backup INCREMENTAL LEVEL 0 AS COMPRESSED BACKUPSET database include current
controlfile;
sql "alter system archive log current";
backup AS COMPRESSED BACKUPSET archivelog all delete input;
release channel ch01;
release channel ch02;
}