Add ASM Instance to Flex ASM

Flex ASM?

Oracle Flex ASM is an ASM instance which will be running in the cluster based on cardinality defined. The default cardinality is 3 

If we have 4 node RAC, ASM will run from any 3 nodes. even in 8 node rac also asm instance will run from 3 nodes, We can add asm instance by changing cardinality 

Check Flex ASM State

ASMCMD> showclustermode

ASM cluster : Flex mode enabled - Direct Storage Access

Asm running from 3 nodes:

[grid@racnode08 bin]$ ./srvctl status asm

ASM is running on racnode06,racnode07,racnode08

Check present asm configuration:

[grid@racnode05 ~]$ srvctl config asm

ASM home: <CRS home>

Password file: +VOTEDISK/orapwASM

Backup of Password file: +VOTEDISK/orapwASM_backup

ASM listener: LISTENER

ASM instance count: 3

Cluster ASM listener: ASMNET1LSNR_ASM

Modify Count(cardinality):

[grid@racnode08 bin]$ ./srvctl modify asm -count 4

[grid@racnode08 ~]$ srvctl config asm

ASM home: <CRS home>

Password file: +VOTEDISK/orapwASM

Backup of Password file: +VOTEDISK/orapwASM_backup

ASM listener: LISTENER

ASM instance count: 4

Cluster ASM listener: ASMNET1LSNR_ASM

ASM is running from all 4 nodes now:

[grid@racnode08 bin]$ ./srvctl status asm

ASM is running on racnode05,racnode06,racnode07,racnode08