Relocating SCAN VIP from one node to another node

Here, I am giving you a demonstration of relocation SCAN from one node to another.

In the below section, we can see that 3 SCAN VIP are running .e 1 VIP is running on rac2 and 2 VIP are running on rac1.

[grid@rac2 bin]$ ./srvctl status scan

SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node rac2
SCAN VIP scan2 is enabled
SCAN VIP scan2 is running on node rac1
SCAN VIP scan3 is enabled
SCAN VIP scan3 is running on node rac1

 

[grid@rac2 bin]$ ./srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node rac2
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node rac1
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node rac1

So, now lets see the syntax for relocating the scan.

[grid@rac2 bin]$ ./srvctl relocate scan -h

Temporarily relocate SCAN VIP from one node of the cluster to another.

Usage: srvctl relocate scan -i <ordinal_number> [-n <node_name>]
-i <scan_ordinal_number> Ordinal number of IP address
-n <node_name> SCAN VIP node name
-h Print usages

Now, lets try to relocate SCAN VIP 1 to rac1.

[grid@rac2 bin]$ ./srvctl relocate scan -i 1 -n rac1

So, as per the below section we can see that now all the scan listener are runing on rac1.Hence, we can also conclude that it is not necessare that SCAN listener has to be run on every node.It can run on all nodes or on partially some nodes.

[grid@rac2 bin]$ ./srvctl status scan
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node rac1
SCAN VIP scan2 is enabled
SCAN VIP scan2 is running on node rac1
SCAN VIP scan3 is enabled
SCAN VIP scan3 is running on node rac1
[grid@rac2 bin]$

 
[grid@rac2 bin]$ ./srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node rac1
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node rac1
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node rac1
[grid@rac2 bin]$