How does RAC determine which instance number to run on which node

Good afternoon
I am trying to script a process and I need to identify how RAC decides which node runs which instance. Is it the first one of the pair added to the cluster that runs node 1 or is there some other piece of information that I need to work this out
This is on Redhat Linux with 10.2.0.3 for CRS, ASM and databases
Cheers
Peter

Before "you" start an instance you set env variable ORACLE_SID. This identifies an instance. When you go into sqlplus and issue STARTUP, Oracle starts the instance named by the sid. Thus the instance running on the server is controlled by you. This changes as noted below.
If you were using a non-Oracle tool to start instances, such as Veritas, then you would see it start the instance you coded into the tool. It would not randomly pick an instance. It looks in the Veritas config file and sees that you always want instance 1 on this node and instance 2 on that node.
That said, you can make Oracle more random or "grid" like. 10g RAC done Oracle's way likes to bounce around between primary and secondary nodes. To see which instances are running on a node you can "ps -ef | grep pmon". Alternatively, use sqlplus to look in the database: view gv$instance gives you each instance name paired with the name of the host it is currently running on. There is one line of output per instance currently running.
-Mark

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How does RAC determine which instance number to run on which node

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