今天是2014-03-30，在安装oracle stand-alone server的时候出现如下错误：
[root@dg-two etc]# /u01/app/11.2.0/grid/root.sh
Performing root user operation for Oracle 11g
The following environment variables are set as:
ORACLE_OWNER= grid
ORACLE_HOME= /u01/app/11.2.0/grid
Enter the full pathname of the local bin directory: [/usr/local/bin]:
The contents of "dbhome" have not changed. No need to overwrite.
The contents of "oraenv" have not changed. No need to overwrite.
The contents of "coraenv" have not changed. No need to overwrite.
Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
To configure Grid Infrastructure for a Stand-Alone Server run the following command as the root user:
/u01/app/11.2.0/grid/perl/bin/perl -I/u01/app/11.2.0/grid/perl/lib -I/u01/app/11.2.0/grid/crs/install /u01/app/11.2.0/grid/crs/install/roothas.pl
To configure Grid Infrastructure for a Cluster execute the following command:
/u01/app/11.2.0/grid/crs/config/config.sh
This command launches the Grid Infrastructure Configuration Wizard. The wizard also supports silent operation, and the parameters can be passed through the response file that is available in the installation media.
[root@dg-two etc]# /u01/app/11.2.0/grid/perl/bin/perl -I/u01/app/11.2.0/grid/perl/lib -I/u01/app/11.2.0/grid/crs/install /u01/app/11.2.0/grid/crs/install/roothas.pl
Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params
User ignored Prerequisites during installation
/u01/app/grid/product/11.2.0/grid/bin/crsctl query crs activeversion ... failed rc=-1 with message:
Failure in execution (rc=-1, 0, No such file or directory) for command /u01/app/grid/product/11.2.0/grid/bin/crsctl query crs activeversion
CRS is already configured on this node for crshome=/u01/app/grid/product/11.2.0/grid
Cannot configure two CRS instances on the same cluster.
Please deconfigure before proceeding with the configuration of new home.
由于之前在该服务器安装过RAc，出现了该问题？
解决方案：
[root@dg-two etc]# /u01/app/11.2.0/grid/crs/install/rootcrs.pl -verbose -deconfig -force Using configuration parameter file: /u01/app/11.2.0/grid/crs/install/crsconfig_params Usage: srvctl