安装11g的集群软件的时候，在最后运行root.sh脚本时候，没有执行成功，最后提示如下错误：
[root@r2 ~]# /u01/app/11.2.0/grid_1/root.sh
CRS-4000: Command Add failed, or completed with errors.
CRS-2728: A resource type with the name 'ora.haip.type' is already registered
CRS-4000: Command Add failed, or completed with errors.
CRS-2728: A resource type with the name 'ora.mdns.type' is already registered
CRS-4000: Command Add failed, or completed with errors.
Failed to register Grid Infrastructure type ora.mdns.type at /u01/app/11.2.0/grid_1/crs/install/crsconfig_lib.pm line 7940.
/u01/app/11.2.0/grid_1/perl/bin/perl -I/u01/app/11.2.0/grid_1/perl/lib -I/u01/app/11.2.0/grid_1/crs/install /u01/app/11.2.0/grid_1/crs/install/rootcrs.pl execution failed
解决方法：
- 进入$grid_home/install/运行./roothas.pl -deconfig -force -verbose后，从新执行root.sh
- [root@r2 ~]# cd /u01/app/11.2.0/grid_1/crs/install/
- [root@r2 install]# ./roothas.pl -deconfig -force -verbose
Using configuration parameter file: ./crsconfig_params
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4000: Command Stop failed, or completed with errors.
CRS-4535: Cannot communicate with Cluster Ready Services
CRS-4000: Command Delete failed, or completed with errors.
CLSU-00100: Operating System function: failed failed with error data: 2
CLSU-00101: Operating System error message: No such file or directory
CLSU-00103: error location: scrsearch3
CLSU-00104: additional error information: id doesnt exist scls_scr_setval
CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'r2'
CRS-2673: Attempting to stop 'ora.mdnsd' on 'r2'
CRS-2673: Attempting to stop 'ora.crf' on 'r2'
CRS-2679: Attempting to clean 'ora.cssd' on 'r2'
CRS-2679: Attempting to clean 'ora.cssdmonitor' on 'r2'
CRS-2677: Stop of 'ora.mdnsd' on 'r2' succeeded
CRS-2677: Stop of 'ora.crf' on 'r2' succeeded
CRS-2673: Attempting to stop 'ora.gipcd' on 'r2'
CRS-2681: Clean of 'ora.cssd' on 'r2' succeeded
CRS-2681: Clean of 'ora.cssdmonitor' on 'r2' succeeded
CRS-2677: Stop of 'ora.gipcd' on 'r2' succeeded
CRS-2673: Attempting to stop 'ora.gpnpd' on 'r2'
CRS-2677: Stop of 'ora.gpnpd' on 'r2' succeeded
CRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'r2' has completed
CRS-4133: Oracle High Availability Services has been stopped.
Successfully deconfigured Oracle Restart stack