In last month, one engineer of our customers made a mistake and changed the file permissions of the whole RAC database wrongly, including GI and DB home. Of course the clusterware could not be started...

First of all, let me show you the installation log: [root@node2 tmp]# /u01/app/11.2.0/grid/OPatch/opatch auto 28813878 -ocmrf /u01/ocm.rsp Executing /u01/app/11.2.0/grid/perl/bin/perl /u01/app/11.2.0/...