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[oracle@rac1 trace]$ crsctl get cluster mode status

Cluster is running in "standard" mode

[oracle@rac1 trace]$

[oracle@rac1 trace]$ crsctl get cluster mode config

Cluster is configured as type "standard"

[oracle@rac1 trace]$

ASMCMD> ASMCMD> showclustermode

ASM cluster : Flex mode enabled

[oracle@rac1 trace]$ srvctl config gns

PRKF-1110 : Neither GNS server nor GNS client is configured on this cluster

[oracle@rac1 trace]$

Add an entry in /etc/hosts for the GNS

192.168.56.121   rac-gns.oracle.com     rac-gns

[root@rac1 bin]# srvctl add gns -vip rac-gns.oracle.com

[root@rac1 bin]# srvctl start gns

[root@rac1 bin]# srvctl status gns

GNS is running on node rac2.

GNS is enabled on node rac2.

[root@rac1 bin]# crsctl set cluster mode flex

CRS-4933: Cluster mode set to "flex"; restart Oracle High Availability Services on all nodes for cluster to run in "flex" mode.

[root@rac1 bin]#

crsctl stop crs -> rac1

crsctl stop crs -> rac2

crsctl start crs –wait  -> rac1

crsctl start crs –wait -> rac2

[root@rac1 bin]# crsctl get cluster mode status

Cluster is running in "flex" mode

[root@rac1 bin]#

[root@rac1 bin]# crsctl get cluster mode config

Cluster is configured as type "flex"

[root@rac1 bin]#