hi ramesh
Can u explain about master and slave nodes. I have 4 node rac, if master is down , which node will take over as master out of 3 alive nodes.
2. can I mannually switch master and slave manually.
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Thursday, 3 Jun 2010 12:27 AM
Hi,
The first node that starts up in your cluster will become the master node. In case the master node fails, the one with the lowest number would normally become the master.
As for switching master to slave, I am not aware of any mechanism to do it. Also, these are processes internal to Oracle, and best left to be managed by Oracle.
The $ORA_CRS_HOME/log/cssd/ocssd.log file will show you which is the current master node. The master node will be the one that backs up your OCR.
Unlike in OPS, with RAC, master node crashes do not impact the availability of cluster, one of the other nodes takes over as the master.
Ramesh