VCM Timout setting

Hi Expertise Team,

I have the question about the cluster failover issue. 

The  Oracle DB server cluster using MP 4.1 on the solaris 9,  DBS01 as a Primary , DBS02 as a Secondary, but the oracle service run on the DBS02 , the DBS01 as a standby node. Once reboot to the dbs02 then the dbs01 not to take over the primary role,  I need to reboot the dbs01 again , dbs01 and dbs02 online , i  switch to failover cluster group from dbs01 to dbs02.  and i want to know what did it happens ?  is it the CVM timeout setting issue or how to check the cluster role , to make sure the dbs01 /dbs02 is master?  Please advice