vi /etc/selinux/config 
SELINUX=disabled
重新执行root.sh

[root@oracledb oracle]# /oradata/app/11.2.0/grid/root.sh
Running Oracle 11g root.sh script...


The following environment variables are set as:
    ORACLE_OWNER= grid
    ORACLE_HOME=  /oradata/app/11.2.0/grid


Enter the full pathname of the local bin directory: [/usr/local/bin]: 
The file "dbhome" already exists in /usr/local/bin.  Overwrite it? (y/n) 
[n]: y
   Copying dbhome to /usr/local/bin ...
The file "oraenv" already exists in /usr/local/bin.  Overwrite it? (y/n) 
[n]: y
   Copying oraenv to /usr/local/bin ...
The file "coraenv" already exists in /usr/local/bin.  Overwrite it? (y/n) 
[n]: y
   Copying coraenv to /usr/local/bin ...


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.sh script.
Now product-specific root actions will be performed.
2014-09-23 00:58:23: Checking for super user privileges
2014-09-23 00:58:23: User has super user privileges
2014-09-23 00:58:23: Parsing the host name
Using configuration parameter file: /oradata/app/11.2.0/grid/crs/install/crsconfig_params
Improper Oracle Clusterware configuration found on this host
Deconfigure the existing cluster configuration before starting
to configure a new Clusterware 
run '/oradata/app/11.2.0/grid/crs/install/rootcrs.pl -deconfig' 
to configure existing failed configuration and then rerun root.sh
[root@oracledb oracle]# 
[root@oracledb oracle]# 


[root@oracledb grid]# cd crs/install/
[root@oracledb install]# ./rootcrs.pl -delete -force -verbose
2014-09-23 02:42:29: Parsing the host name
2014-09-23 02:42:29: Checking for super user privileges
2014-09-23 02:42:29: User has super user privileges
Using configuration parameter file: ./crsconfig_params
Usage: srvctl