ASMCMD Command Guide

ASMCMD (Automatic Storage Management Command-Line Interface) is used to manage ASM resources like disk groups, disks, and instances. Below are essential ASMCMD commands for your reference.

General Operations

Task	Command(s)	Example
List all disk groups	ASMCMD> lsdg	Example: ASMCMD> lsdg
Include dismounted disk groups	ASMCMD> lsdg --discovery	Lists both mounted and dismounted disk groups.
List disk groups across nodes	ASMCMD> lsdg -g --discovery	Lists disk groups from all nodes in a cluster.
List ASM disks	ASMCMD> lsdsk -k	Example: ASMCMD> lsdsk -k lists all ASM disks with their total and free space.

Disk and Disk Group Operations

Task	Command(s)	Example
List disks of a specific disk group	ASMCMD> lsdsk -k -G <group_name>	Example: ASMCMD> lsdsk -k -G DATA_W3BUDDY (disks in the DATA_W3BUDDY group).
List disk creation dates	ASMCMD> lsdsk -t -G <group_name>	Example: ASMCMD> lsdsk -t -G DATA_W3BUDDY.
List only candidate disks	ASMCMD> lsdsk --candidate -k	Displays unassigned disks eligible for ASM.
Unmount all disk groups	ASMCMD> umount -a	Example: ASMCMD> umount -a.
Unmount a specific disk group	ASMCMD> umount <group_name>	Example: ASMCMD> umount DATA_W3BUDDY.
Mount all disk groups	ASMCMD> mount -a	Example: ASMCMD> mount -a.
Mount a specific disk group	ASMCMD> mount <group_name>	Example: ASMCMD> mount DATA_W3BUDDY.

ASM Disk Group Attributes

Task	Command(s)	Example
List all attributes of disk groups	ASMCMD> lsattr -lm	Example: ASMCMD> lsattr -lm.
List attributes for a specific group	ASMCMD> lsattr -lm -G <group_name>	Example: ASMCMD> lsattr -lm -G DATA_W3BUDDY.
List attributes matching a pattern	ASMCMD> lsattr -lm %<pattern>%	Example: ASMCMD> lsattr -lm %au_size% (filters attributes related to allocation unit sizes).

ASM Disk Group Rebalancing

Task	Command(s)	Example
Rebalance a disk group	ASMCMD> rebal --power <limit> <group_name>	Example: ASMCMD> rebal --power 8 DATA_W3BUDDY.
Monitor rebalance progress	ASMCMD> lsop	Example: ASMCMD> lsop.

Password File and Template Information

Task	Command(s)	Example
Get password file of a database	ASMCMD> pwget --dbuniquename <db_name>	Example: ASMCMD> pwget --dbuniquename W3BUDDYDB.
Get password file of ASM	ASMCMD> pwget --asm	Example: ASMCMD> pwget --asm.
Get ASM template info of a disk group	ASMCMD> lstmpl -l -G <group_name>	Example: ASMCMD> lstmpl -l -G DATA_W3BUDDY.

ASM Cluster and Configuration

Task	Command(s)	Example
Check if Flex ASM is enabled	ASMCMD> showclustermode	Example: ASMCMD> showclustermode.
Check cluster state	ASMCMD> showclusterstate	Example: ASMCMD> showclusterstate.
View ASM version	ASMCMD> showversion	Example: ASMCMD> showversion.
Get ASM SPFILE location	ASMCMD> spget	Example: ASMCMD> spget.
Backup ASM SPFILE	ASMCMD> spbackup <source_spfile> <destination_path>	Example: ASMCMD> spbackup +MGMT/W3BUDDY-CLUSTER/ASMPARAMETERFILE /home/oracle/asmspfile_w3buddy.ora.

Advanced Operations

Task	Command(s)	Example
List open files of a disk group	ASMCMD> lsof -G <group_name>	Example: ASMCMD> lsof -G DATA_W3BUDDY.
List open files of a database	ASMCMD> lsof --dbname <db_name>	Example: ASMCMD> lsof --dbname W3BUDDYDB.
Check filter driver state	ASMCMD> afd_state	Example: ASMCMD> afd_state.
List filter driver disks (if enabled)	ASMCMD> afd_lsdsk	Example: ASMCMD> afd_lsdsk.