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Clusterware/Grid Infrastructure (GI) is started at boot time by Linux/UNIX /etc/inittab configuration (this is automatically configured when installing GI).
Following picture details the 11.2 GI startup: http://docs.oracle.com/cd/E11882_01/rac.112/e16794/intro.htm#BABIDEFI.
By default GI is going to start all cluster resources using OCR configuration: VIPs, node applications, ASM instances, listeners, database instances .
For the auto start of CRS, you can find out the file (crsstart or ohasdstr) under /etc/oracle/scls_scr/`hostname`/root/. This file would store the value to indicate auto start or not.
enable auto start
crsctl enable crs
disable autod start
crsctl disable crs
For the CRS resource, you can check the requested resource with "crs_stat -p <resource name>". The output of "crs_stat -p" would show out the dependence resource.