执行命令：
RMAN> backup database plus archivelog;
RMAN> backup database plus archivelog;
Starting backup at 26-MAY-14
current log archived
using channel ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 05/26/2014 16:32:54
RMAN-06059: expected archived log not found, lost of archived log compromises recoverability
ORA-19625: error identifying file /u01/oracle/product/10.2.0/db_home1/ora10g/dbs/arch2_13_848317991.dbf
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
原因：RAC双机只修改了一个实例的归档路径参数 log_archive_dest_1
解决方法：
原因：RAC双机只修改了一个实例的归档路径参数 log_archive_dest_1
解决方法：
SQL> alter system set log_archive_dest_1='location=+RAWHAHA/arc' sid='ora10g1';
System altered.
SQL> alter system set log_archive_dest_1='location=+RAWHAHA/arc' sid='ora10g2';
System altered.