Oracle 12c enhancements for SCAN

There are new features for SCAN in Oracle 12c:

1. SCAN and Oracle Clusterware managed VIPs now support IPv6 based IP addresses.
So now we can use also IPv6 addresses with SCAN. If you check SCAN configs with:
srvctl config scan
it will list you more info: SCAN name, IPv4 address, IPv6 address, SCAN number+VIP



2. SCAN is by default restricted to only accept service registration from nodes in the cluster.
If you want to add nodes (for example for the database that are not using cluster's private interconnect) then you can do it with command:
srvctl modify scan_listener -invitednodes <new_database_name> –update
You can also run this modify before you present real node in the cluster.
 
If you check SCAN-listener configs with:
srvctl config scan_listener
it will list you more info: SCAN-listener name+port, Registration invited nodes, Registration invited subnets



3. SCAN supports multiple subnets in the cluster (one SCAN per subnet).

Before you can do this you must enable multiple subnets for the cluster (This is a post-installation task an cannot be made in Grid Infra installation). 

 


NOTE! Here you can find more info about SCAN and Oracle 12c enhancements :
http://www.oracle.com/technetwork/products/clustering/overview/scan-129069.pdf