Starting backup at 11-SEP-11
RMAN-03009: failure of backup command on c1 channel at 09/11/2011 17:48:09
ORA-19505: failed to identify file "/opt/rac/oracle/11.2.0/db/dbs/orapwrac1"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
continuing other job steps, job failed will not be re-run
released channel: c1
released channel: c2
released channel: s1
released channel: s2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 09/11/2011 17:48:10
RMAN-03015: error occurred in stored script. Memory Script
RMAN-03009: failure of backup command on c1 channel at 09/11/2011 17:48:09
ORA-19505: failed to identify file "/opt/rac/oracle/11.2.0/db/dbs/orapwrac1"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
提示说明找不到rac1 节点的密码文件,查看节点rac1上的存在orapwrac1 和orapwrac2文件，而节点rac2上不存在
解决办法
将节点rac1上的密码文件orapwrac1拷贝到节点rac2上
#scp orapwrac1 10.250.7.241:/opt/oracle/11.2.0/alifpre/
===============================================================================
connected to auxiliary database (not started)
released channel: c2
released channel: c1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 09/11/2011 17:59:06
RMAN-03015: error occurred in stored script. Memory Script
RMAN-04014: startup failed: ORA-00845: MEMORY_TARGET not supported on this system
RMAN-04017: startup error description: ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
这里遇见 ORA-00845，因为目标库上运行了两个数据库，内存空间不足，导致 ORA-00845！
解决办法：关闭另外一个数据库实例。
==============================================================================
备库日志中出现：
PING[ARC2]: Heartbeat failed to connect to standby 'yangdb'. Error is 16032.
Sun Sep 11 19:03:49 2011
Errors in file /opt/rac/oracle/diag/rdbms/rac/rac2/trace/rac2_arc2_25846.trc:
ORA-16032: parameter destination string cannot be translated
PING[ARC2]: Heartbeat failed to connect to standby 'yangdb'. Error is 16032.
Sun Sep 11 19:09:49 2011
Errors in file /opt/rac/oracle/diag/rdbms/rac/rac2/trace/rac2_arc2_25846.trc:
ORA-16032: parameter destination string cannot be translated
PING[ARC2]: Heartbeat failed to connect to standby 'yangdb'. Error is 16032.
Sun Sep 11 19:15:50 2011
Errors in file /opt/rac/oracle/diag/rdbms/rac/rac2/trace/rac2_arc2_25846.trc:
ORA-16032: parameter destination string cannot be translated
PING[ARC2]: Heartbeat failed to connect to standby 'yangdb'. Error is 16032.
原因：目的参数无法解析。查看了mos文档，次错误与备库的standby_archive_dest的设置方式有关
解决方法：
SQL> show parameter standby
NAME TYPE VALUE
------------------------------ ----------------------------------------
standby_archive_dest string location=/opt/rac/oracle/arch
standby_file_management string MANUAL
SQL> alter system set standby_archive_dest='/opt/rac/oracle/arch' scope=both sid='*';
System altered.
SQL> show parameter standby
NAME TYPE VALUE
---------------------- ------------ ------------------------------
standby_archive_dest string /opt/rac/oracle/arch
standby_file_management string MANUAL
再次执行，问题解决。。