copy完成后，修改pfile文件。去掉rac的所有参数属性。
启动到nomount状态，这里报了个错
ORA-29702: error occurred in Cluster Group Service operation

百度下，找到解决的办法，下面转下：
在metalink上搜索了ORA-29702,找到了一个非常有价值的文章,内容如下:

Starting Instance Fails with ORA-29702 [ID 216030.1]

修改时间 16-SEP-2010类型 PROBLEM状态 PUBLISHED

fact: Oracle Server Enterprise Edition 8

fact: Oracle Parallel Server (OPS)

fact: AIX-Based Systems

symptom: Starting database fails

symptom: ORA-29702: error occurred in Cluster Group Service operation

symptom: Mounting database in Non-OPS (exclusive) mode

symptom: Environment not configured for OPS

cause: Oracle in IBM RS6000 SP installs the Parallel Server Option as the

default option. As a result, Oracle tries to communicate with GMS or Cluster

Manager during startup, but the environment is not configured to work in

Parallel Server mode.

fix:

Relink Oracle to disable Parallel Server Option:

$ cd $ORACLE_HOME/rdbms/lib

$ make -f ins_rdbms.mk no_parropt

$ make -f ins_rdbms.mk install

不管是AIX还是HPUX都是一样，单机和双机转换。oracle软件方面转换。

ITPub博客

oracle 10g rac转成单机2