ASM_DISKGROUPS
The ASM_DISKGROUPS initialization parameter specifies a list of the names of disk groups that an ASM instance mounts at startup.

Eg :
SQL> show parameter asm_diskgroups

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskgroups string DATA, FLASH


ASM_DISKSTRING
The ASM_DISKSTRING initialization parameter specifies a comma-delimited list of strings that limits the set of disks that an ASM instance discovers. The discovery strings can include wildcard characters. Only disks that match one of the strings are discovered.

Eg:

SQL> show parameter asm_diskstring

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_diskstring string /dev/oracleasm/disks/VOL*


ASM_POWER_LIMIT
The ASM_POWER_LIMIT initialization parameter specifies the default power for disk rebalancing. The default value is 1 and the range of allowable values is 0 to 11 inclusive. A value of 0 disables rebalancing.

SQL> show parameter asm_power

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
asm_power_limit integer 11


INSTANCE_TYPE
The INSTANCE_TYPE initialization parameter must be set to ASM for an ASM instance. This is a required parameter and cannot be modified.


SQL> show parameter instance_type

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
instance_type string asm


SQL> show parameter instance_name

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
instance_name string +ASM1
SQL>