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Please read about the Oracle High Availability Service Stack documented in Oracle® Clusterware Administration and Deployment Guide
+11g Release 2 (11.2)+ : http://docs.oracle.com/cd/E11882_01/rac.112/e16794/intro.htm#BABIDEFI.
The process ohasd.bin started by init from /etc/inittab is the first process started.
Example : Two node RAC. RAC1 and RAC2 instances.
Stopping RAC2 Instance :
1. Shutdown the Instance running on RAC2
2. ./srvctl stop asm -n csbppmaadbs02
3. ./srvctl stop nodeapps -n csbppmaadbs02
4. ./srvctl stop listener -n csbppmaadbs02
5. Check "./crs_stat -t"
Note 1 : Check the following also for healthy status & If any service of RAC that also we have to check.
6./crsctl check crs
CSS appears healthy
CRS appears healthy
EVM appears healthy
Starting RAC2 Instance
1 ./srvctl start nodeapps -n csbppmaadbs02
2 ./crs_stat -t
3 ./srvctl start listener -n csbppmaadbs02
4 ./srvctl start asm -n csbppmaadbs02
5. Start the Instance of RAC2
6. ./crs_stat -t
Hope it helps...