Can SCAN VIPs also come back, when the node is Up after failover?

Hi,
Consider a two node cluster, as two SCAN vips are running on Node1 and one on Node2.
As,Node1 is down so the resources and the Node vip failovers to other node.
When the Node1 is back again, what about the SCAN VIPS they will also come back and work for Node1.
Thank you
-Satya

Hello,
First of all answer of your question is YES.
Now Oracle suggest that we should use 3 SCAN VIPs (SCAN LISTENERs).
See this demo for your question:
I have 3 node RAC setup : HOST01 & HOST02
*# crsctl stat res -t*
As you can see currently SCAN VIPs are running on all the machines, now i am going to stop crs from HOST02 and see the status of SCAN VIPs:
From host02
# crsctl stop crs
FROM HOST01,
*# crsctl stat res -t*
[root@host01 ~]# crsctl stat res -t
NAME TARGET STATE SERVER STATE_DETAILS
Cluster Resources
ora.LISTENER_SCAN1.lsnr
*1 ONLINE ONLINE host01*
ora.LISTENER_SCAN2.lsnr
*1 ONLINE ONLINE host01*
ora.LISTENER_SCAN3.lsnr
*1 ONLINE ONLINE host01*
ora.gns
1 ONLINE ONLINE host01
ora.gns.vip
1 ONLINE ONLINE host01
ora.host01.vip
1 ONLINE ONLINE host01
ora.host02.vip
1 ONLINE INTERMEDIATE host01 FAILED OVER
ora.host03.vip
1 ONLINE INTERMEDIATE host01 FAILED OVER
ora.oc4j
1 OFFLINE OFFLINE
ora.orcl.amdbs.svc
1 ONLINE ONLINE host01
2 ONLINE OFFLINE
ora.orcl.db
1 ONLINE ONLINE host01
2 ONLINE OFFLINE
3 ONLINE OFFLINE
ora.scan1.vip
*1 ONLINE ONLINE host01*
ora.scan2.vip
*1 ONLINE ONLINE host01*
ora.scan3.vip
*1 ONLINE ONLINE host01*
[root@host01 ~]#
This time you can see all the SCAN VIPs are running on HOST01.
Again after starting crs on both the machines : HOST02
see the status again :
*# crsctl stat res -t*
[root@host01 ~]# crsctl stat res -t
NAME TARGET STATE SERVER STATE_DETAILS
Cluster Resources
ora.LISTENER_SCAN1.lsnr
*1 ONLINE ONLINE host02*
ora.LISTENER_SCAN2.lsnr
*1 ONLINE ONLINE host01*
ora.LISTENER_SCAN3.lsnr
*1 ONLINE ONLINE host01*
ora.gns
1 ONLINE ONLINE host01
ora.gns.vip
1 ONLINE ONLINE host01
ora.host01.vip
1 ONLINE ONLINE host01
ora.host02.vip
1 ONLINE ONLINE host02
ora.host03.vip
1 ONLINE INTERMEDIATE host01 FAILED OVER
ora.oc4j
1 OFFLINE OFFLINE
ora.orcl.amdbs.svc
1 ONLINE ONLINE host01
2 ONLINE OFFLINE
ora.orcl.db
1 ONLINE ONLINE host01
2 ONLINE OFFLINE
3 ONLINE OFFLINE
ora.scan1.vip
*1 ONLINE ONLINE host02*
ora.scan2.vip
*1 ONLINE ONLINE host01*
ora.scan3.vip
*1 ONLINE ONLINE host01*
*[root@host01 ~]#*
After starting crs on HOST02 again SCAN VIPs move back to HOST02 automatically.
Thanks,
Ashish Shukla
Edited by: Ashish Shukla on May 15, 2013 7:19 PM

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