Starting oracle rac node2 error: ORA-29701: unable to connect to Cluster Synchronization Service I have a oracle RAC /12c/. I got these error when I try start the base from node2.
```ORA-01078: failure in processing system parameters

ORA-01565: error in identifying file '+DATA/mydborcl/spfilemydborcl.ora'

ORA-17503: ksfdopn:2 Failed to open file +DATA/mydborcl/spfilemydborcl.ora

ORA-29701: unable to connect to Cluster Synchronization Service```

I am very new to oracle. How can I start the mount the database on node2 and solve the problem?
ORA-29701: unable to connect to Cluster Synchronization Service

You need to make sure the the Grid Infrastructure services are started first. They provide all of the networking and ASM storage for the cluster, and you can't start a database instance without them.
On Linux, as root, run crsctl start crs
The command crsctl stat res -t should show you the state of all cluster services.