ASM parameters

INSTANCE_TYPE
should be set to ASM for ASM instances. This is the only parameter
that must be defined. For database instances, this is set to the value RDBMS.

ASM_POWER_LIMIT controls the speed for a rebalance operation. Values range from 1 through 11, with 11 being the fastest. If omitted, this value defaults to 1.

ASM_DISKSTRING is an operating system–dependent value used by ASM to limit the set of disks considered for discovery. The default value is the null string, and this will be sufficient in most cases. A more restrictive value as shown above may reduce the time
required for ASM to perform discovery, and thus improve disk group mount times.

ASM_PREFERRED_READ_FAILURE_GROUPS specifies the failure groups that contain preferred read disk. This is useful in extended or stretched cluster databases that have
mirrored copies of data with one of the copies in close proximity to the server.

DIAGNOSTIC_DEST specifies the location of the Automatic Diagnostic Repository (ADR) home. Trace files, alert logs, core files, and incident files can be found under this
directory. The default value of this parameter is derived from the value of ORACLE_BASE.

ASM_DISKGROUPS is the list of names of disk groups to be mounted by an ASM instance at startup, or when the ALTER DISKGROUP ALL MOUNT command is used. Oracle Restart can mount disk groups if they are listed as dependencies even if they are not listed with the ASM_DISKGROUPS parameter. This parameter has no default value.

LARGE_POOL_SIZE specifies (in bytes) the size of the large pool allocation heap. The large pool allocation heap is used in shared server systems for session memory, by parallel execution for message buffers, and by backup processes for disk I/O buffers. The ASM instance makes use of automatic memory management, so this parameter serves as a minimum size that the large pool can be lowered to.

REMOTE_LOGIN_PASSWORDFILE specifies whether the Oracle software checks for a password file. The default value is EXCLUSIVE.

Automatic memory management is enabled by default on ASM instances,
event when the that MEMORY_TARGET parameter is not explicitly set. This is the only parameter you need to set for complete ASM memory management. Oracle Corporation strongly lrecommends that you use automatic memory management for ASM