The following is a summarized procedure in how to convert from Oracle 12c standard Cluster to Oracle New Flex cluster.
- Execute the following command to check your current cluster mode:
crsctl get cluster mode status
cluster is running in “standard” mode
- Run the command to check that GNS is configured with fixed IP:
srvctl config gns
** if GNS is not configured then you need to do so by executing the following command as “root” after making sure that GNS IP entry is added in DNS server:
srvctl add gns -vip vipname | ip_address
srvctl start gns
- Set the mode of the cluster to “flex” by executing the below command as “root”:
crsctl set cluster mode flex
Cluster mode set to “flex”
- Stop/Start the cluster so the new mode takes affect:
crsctl stop crs
crsctl start crs
Status of cluster mode is “FLEX”
Important Final Remarks:
- The cluster conversion is one direction from standard===> Flex ONLY.
- GNS is required with fixed IP address for Flex setup.
- Oracle Flex cluster works ONLY with Oracle Flex ASM, while Oracle Flex ASM can work with either standard or Flex cluster.
Oracle Flex Cluster Architecture