manage the cluster

To start the cluster:

1. login as root
2. run:
   $ORA_CRS_HOME/bin/crsctl start crs
   you should get :
   Attempting to start CRS stack
   The CRS stack will be started shortl

If case the cluster is not started (crs_stat)
check logs at : $ORA_CRS_HOME/log/`hostname`/crsd
and : $ORA_CRS_HOME/log/`hostname`/cssd

on all nodes .

usefull commands in RAC

srvctl -V
retrun clusterware version

How the oracle clusterware behave

1. Oracle clusterware is calling all the scripts on $CRS_HOME/racg/usrco on the node where the actions take place. and only on this node.
   
2. 
   

RAC - Troubleshooting

Overview

The clusterware is an oracle software which manage oracle and user defined resources.
There a lot of places which can get wrong. This post intend to provide the initial steps for troubleshooting RAC.

Ok ... you did srvctl .... and go an error . What next ?

1. relax .

2. go the machine which has reported on the error (incase you don't sure . go to the machine you run the command on .

3. cd $ORA_CRS_HOME/log/`hostname`/crsd

4. check crsd.log for errors.


When thing is important to remember :
when something in wrong , first check on the node level .
For example - If cluster can not start database - check alertlog, try to start database without RAC .