While we need to shutdown any of exadata(same for any RAC DB) DB Nodes I normally follow below checklist.
1. from DB & ASM node run below query and cahek all the nodes are in open staus
select * from gv$instance;
2. login to the target DB node with oracle user and set .oracrs.sh env
3. now shutdown the instance on the target node using below command
/u01/app/11.2.0/grid/bin/srvctl stop instance -d ORADB -i
4. FROM DB node run belwo quert to be sure that target instance is now down
select * from gv$instance;
5. now login as root and run below command to shudown CRS
/u01/app/11.2.0/grid/bin/crsctl stop crs
-- from DB node run below command and make sure that crs is down [CRS-0184]
/u01/app/11.2.0/grid/bin/crs_stat -t
CRS-0184: Cannot communicate with the CRS daemon.
6. FROM ASM run below query to make sure that ASM on tgaret hots is down
select * from gv$instance;
7. shutdown the DB machine
8. startup the DB machine
9. check with below command the all the cluster services are online except .gsd and .oc4j
/u01/app/11.2.0/grid/bin/crs_stat -t|grep OFFLINE
--from DB node with oracle user and .oracrs.sh env run below command to make sure that all the ASM disks are online
asmcmd
ASMCMD> ls
. oracrs.sh
sqlplus / as sysasm
10. if any disk is missing the from ASM instance of the target machine run below command to make the perticular disk online
alter diskgroup
11. chek that DB instance is online or not if not automatically online use below command to make it online
srvctl start -d axdw -i
12. from ASM & DB instance user below query to check all the ASM and DB instances are online
select * from gv$instance;
13. from ASM & DB instance user below query to check all the ASM DISKS are online from all the instance
select header_status,mode_status,state,failgroup,count(*) from gv$asm_disk group by header_status,mode_status,state,failgroup;
14. check alertlog of both db & asm for the target node
