TSM+RAC备份arch报错ORA-12154

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-12001: could not open channel c1

RMAN-10008: could not create channel context

RMAN-10003: unable to connect to target database

ORA-12154: TNS:could not resolve the connect identifier specified

RAC一切正常，TSM登录正常，全备正常，大侠求教？？？？？？