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RAC SCAN confusion.

646155Dec 19 2010 — edited Oct 15 2011
Oracle RAC needs two ip address one for the private interconnect and one for the VIP (for the uses and applications to connect to). oracle also says that a network interface should not be bound to any of the scan ip address. my doubt is.

1. if we have about 9 nodes in the cluster. oracle says that the scan name can resolve to a maximum of 3 ip address. does this mean that we need 3 oracle scans.
2. REALLY CONFUSED HERE scan ip address is not bound to any network interface. so the clients will be connecting using the scan vip. now..
oracle needs two ip address one for private (one network interface) and
public (vip another network interface) (here do we need an additional network interface card for the SCAN with out any ip assigned to it). so if scan needs an additional interface card then it makes that we need 3 interface card right.
3. oracle RAC instance registers only with SCAN listeners (is it correct). if correct then can we have a single SCAN listener listening to 3 network ipaddress that the scan resolves to. or do we need 3 scan listeners for this purpose each listener listening to one ip address scan resolves to. and more over will these 3 listeners to be configured on all of the nodes.

please help guys,
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Locked on Nov 12 2011
Added on Dec 19 2010
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