During installation or system startup, Oracle Grid Infrastructure may fail to start

After successful installation of Oracle RAC 11g Release 2 Grid Infrastructure, while executing the root.sh script, ohasd may fail to start. Similarly, during system startup, Oracle Grid Infrastructure may fail to start though the VCS engine logs may indicate that the cssd resource started Oracle Grid Infrastructure successfully.

For possible causes and workarounds, see the Oracle Metalink document: 1069182.1