IP defined to multiple cluster packages

[Carol Levandoski]

My oracle user wants to define the same IP address for his listener to two different cluster packages. What would the impact of that be to the cluster environment overall?

[John Bigg]

Unfortunately you cannot easily do this. Serviceguard does not support adding the same IP addresses in multiple packages and will error if you try this. The only thing I can think of it to combine listeners into their own package or to manually script this yourself.

I wonder how it makes sense for the same IP to be added to multiple packages though. What happens if you end up in a situation where you have 1 package on 1 node and the other on another?

[Armin Kunaschik]

If you can make sure that both cluster packages always run on the same node all the time, this might work.
But it's bad design and you will run into trouble if the packages run on different nodes... and they will... that's Murphy's law :-)

Cluster packages need to be independent from each other.. by any means!
Any you will break that rule because the listener itself is part of one package and would be responsible for both packages.
Despite of that an IP address can only be active on one host at a time.

You have 2 choices:
1. combine both packages using the same IP address
2. describe the impossibility of that setup to you DBA.

My 2 cents,
Armin

PS: Assign points if you find answers useful!