Oracle 10g RAC - service not registered.

Our 2 node 10g RAC database would not startup after being shut down. The database was generating an error after trying to startup with command
srvctl start database -d db1

It turns out that one of the other DBAs modified some database parameters sga_target to 1710 and forgot to add the M or convert it to bytes...ouch!

Somehow one of the nodes got unregistered from the cluster.

Soln:
The following command was used to add back the instance to the cluster
srvctl add instance -d dbname -i instance_name -n nodename

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