Essential ASMCMD and CRSCTL Commands as Key Expertise for Oracle DBAs
Posted by Mir Sayeed Hassan on April 9th, 2026
Essential ASMCMD and CRSCTL Commands as Key Expertise for Oracle DBAs
Overview:
ASMCMD is a command-line utility in Oracle Automatic Storage Management (ASM) used by Oracle DBAs to manage ASM disk groups and files. It provides a Linux-like interface to perform navigation, monitor storage, and execute file operations.
List All ASM Disk Groups in Oracle Using ASMCMD
ASMCMD> lsdg
Include Dismounted ASM Disk Groups in Oracle ASMCMD
ASMCMD>lsdg —discovery
List ASM Disk Groups Across All Cluster Nodes Using ASMCMD
ASMCMD>lsdg -g —discovery
List ASM Disks in Oracle Using ASMCMD
ASMCMD> lsdsk -k
List Disks in ASM Disk Group ORADATA with Total and Free Space Using ASMCMD
ASMCMD> lsdsk -k -G ORADATA
List ASM Disks in Disk Group ORADATA with Group and Disk Numbers Using ASMCMD
ASMCMD> lsdsk -p -G ORADATA
List ASM Disk Creation Dates Using ASMCMD
ASMCMD> lsdsk -t -G ORADATA
List Candidate ASM Disks Only Using ASMCMD”
ASMCMD> lsdsk --candidate -k
List Member ASM Disks in Oracle ASM
ASMCMD> lsdsk --candidate -p
List View Attributes of All ASM Disk Groups in Oracle ASM
ASMCMD> lsattr -lm
List Attributes of Specific ASM Disk Group ARCH in Oracle ASM
ASMCMD> lsattr -lm -G ARCH
Group_Name Name Value RO Sys ARCH access_control.enabled FALSE N Y ARCH access_control.umask 066 N Y ARCH au_size 1048576 Y Y ARCH cell.smart_scan_capable FALSE N N
Filter ASM Disk Group Attributes by Specific Pattern in Oracle ASM
ASMCMD> lsattr -lm %au_size%
Group_Name Name Value RO Sys ORADATA au_size 1048576 YY BMI au_size 1048576 YY CRMG au_size 1048576 YY ARCH au_size 1048576 YY FSMS au_size 1048576 YY
Unmount an ASM Disk Group in Oracle ASM
Note: Unmounts an ASM disk group to safely make it unavailable for database access and maintenance operations.
Unmount All ASM Disk Groups in Oracle ASM
ASMCMD> umount -a
Unmount Specific ASM Disk Group ARCH in Oracle ASM
ASMCMD> umount ARCH
Mount an ASM Disk Group in Oracle ASM
Mounting an ASM disk group makes it available for database access, enabling Oracle to read and write files stored within the disk group.
Mount All ASM Disk Groups on the Local Node in Oracle ASM
ASMCMD> mount -a
Mount a Specific ASM Disk Group on the Local Node in Oracle ASM
ASMCMD> mount ARCH
View ASM Template Information for a Disk Group in Oracle ASM
ASMCMD> lstmpl -l -G ARCH 0 Group_Name Group_Num MirrReg ARCH 1 COLD Name ARCHIVELOG ASMPARAMETERFILE AUDIT_SPILLFILES AUTOBACKUP AUTOLOGIN_KEY_STORE BACKUPSET Stripe Sys Redund PriReg COARSE Y UNPROT COLD COARSE Y UNPROT COLD
Check Flex ASM Configuration Status in Oracle ASM
ASMCMD> showclustermode
ASM cluster : Flex mode disabled
Check Cluster State in Oracle Grid Infrastructure
ASMCMD> showclusterstate
Normal
Check Oracle ASM Version in Oracle Grid Infrastructure
ASMCMD> showversion
ASM version : 12.1.0.2.0
Retrieve ASM SPFILE Location in Oracle ASM
ASMCMD> spget +MGMT/DBATRN-cluster/ASMPARAMETERFILE/registry.253.899644763
Backup ASM SPFILE in Oracle ASM
— copy backup of spfile to a specific location
ASMCMD> spbackup +MGMT/DBATRN- cluster/ASMPARAMETERFILE/registry.253.899644763 /home/oracle/backup/spfile/asmspfile.ora
Identify Clients Connected to an ASM Disk Group in Oracle ASM
ASMCMD> lsct ARCH DB_Name Status Disk Group DBATRN CONNECTED ARCH
Rebalance an ASM Disk Group in Oracle ASM
Rebalance ASM Disk Group ARCH with ASM_POWER_LIMIT Set to 8 in Oracle ASM”
ASMCMD> rebal --power 8 ARCH Rebalance on progress.
Monitor ASM Disk Group Operation Progress in Oracle ASM
ASMCMD> lsop Group_Name Pass State Power EST_WORK EST_RATE EST_TIME ARCH COMPACT RUN 8 0 16831 0 ARCH REBALANCE DONE 8 0 0
Retrieve ASM Diskstring Configuration in Oracle ASM
ASMCMD> dsget parameter:ORCL:* profile:ORCL:*
Software_Version Compatible_version Instance_Name
List ASM Users and Password Details in Oracle ASM
ASMCMD> lspwusr Username sysdba sysoper sysasm SYS TRUE TRUE TRUE ASMSNMP TRUE FALSE FALSE 12.1.0.2.0 12.1.0.2.0 DBACLASS1
List Open Files in an ASM Disk Group in Oracle ASM
ASMCMD>lsof -G ARCH
List Open Files Associated with a Database in Oracle ASM”
— Open files of a database( DBATRN)
ASMCMD>lsof --dbname DBACLASS
Check ASM Filter Driver Status in Oracle ASM
ASMCMD> afd_state
ASMCMD-9526: The AFD state is 'NOT INSTALLED' and filtering is 'DEFAULT' on host 'mshdbora1'
List ASM Filter Driver Disks in Oracle ASM
ASMCMD> afd_lsdsk
Retrieve ASM Filter Driver Diskstring Configuration in Oracle ASM
ASMCMD> afd_dsget AFD discovery string
Retrieve Database Password File in Oracle Database
ASMCMD> pwget --dbuniquename DBATRN +ORADATA/DBATRN/PASSWORD/pwdbatrn.256.8453412312
Retrieve ASM Instance Password File in Oracle ASM”
ASMCMD> pwget --asm +MGMT/orapwASM
CRSCTL commands
CRSCTL is a command-line utility in Oracle Grid Infrastructure used by DBAs to manage, monitor, and control cluster resources and services, ensuring efficient operation and high availability of Oracle RAC environments.
Start and Stop Oracle Clusterware (CRS) Services as Root User
$GRID_HOME/bin/crsctl stop crs $GRID_HOME/bin/crsctl start crs
Enable or Disable Automatic Restart of Oracle Clusterware (CRS)
$GRID_HOME/bin/crsctl disable crs $GRID_HOME/bin/crsctl enable crs
Retrieve Oracle Cluster Name in Oracle Grid Infrastructure
$GRID_HOME/bin/cemutlo -n or $GRID_HOME/bin/olsnodes -c
Check Oracle Grid Infrastructure Version
SYNATX – $GRID_HOME/bin/crsctl query crs softwareversion <hostname)
$GRID_HOME/bin/crsctl query crs softwareversion host-dbaclass1
Check Oracle Clusterware Component Status in Oracle Grid Infrastructure
$GRID_HOME/bin/crsctl stat res -t $GRID_HOME/bin/crsctl check crs $GRID_HOME/bin/crsctl check cssd $GRID_HOME/bin/crsctl check crsd $GRID_HOME/bin/crsctl check evmd
Locate Voting Disk Configuration in Oracle Clusterware
$GRID_HOME/bin/crsctl query css votedisk
Locate Oracle Cluster Registry (OCR) Configuration in Oracle Clusterware
$GRID_HOME/bin/ocrcheck
Retrieve Cluster Interconnect Details in Oracle Grid Infrastructure
$GRID_HOME/bin/oifcfg getif app-ipmp0 172.16.5.191 global public oradbpredbib0 172.16.4.173 global cluster_interconnect oradbpredbib1 172.16.4.0 global cluster_interconnect select NAME,IP_ADDRESS from v$cluster_interconnects; NAME IP_ADDRESS --------------- ---------------- oradbpredbib0 172.16.4.191 oradbpredbib1 172.16.3.1
Check CRS Status on the Local Node in Oracle Clusterware
crsctl check crs
CRS-4638: Oracle High Availability Services is online CRS-4537: Cluster Ready Services is online
CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online
Check Status of All CRS Resources in Oracle Cluster-ware
$GRID_HOME/bin/crsctl stat res -t $GRID_HOME/bin/crsctl stat res -t -init
Check Active Cluster Version in Oracle Grid Infrastructure
crsctl query crs activeversion
Oracle Clusterware active version on the cluster is [12.1.0.2.0]
Start and Stop Oracle High Availability Services (HAS) in Oracle Grid Infrastructure
crsctl stop has crsctl start has
Check CRS Status on Remote Nodes in Oracle Clusterware
crsctl check cluster crsctl check cluster -all
Retrieve OCR Backup Details in Oracle Clusterware
ocrconfig -showbackup
Check ASM Deployment Type (Standard or Flex) in Oracle ASM
crsctl get cluster mode status Cluster is running in "standard" mode
Check Oracle Clusterware Configuration in Oracle Grid Infrastructure
crsctl config crs
Check Disk Timeout (DISKTIMEOUT) from Node to Voting Disk in Oracle Clusterware
crsctl get css disktimeout
CRS-4678: Successful get disktimeout 200 for Cluster Synchronization Services.
Check Interconnect Network Latency (MISSCOUNT) in Oracle Clusterware
crsctl get css misscount
CRS-4678: Successful get misscount 30 for Cluster Synchronization Services.
Retrieve Cluster Configuration Details in Oracle Grid Infrastructure
$ crsctl get cluster configuration Name : dbaclass-cluster Configuration : Cluster Class : Standalone Cluster Type : flex The cluster is not extended. -------------------------------------------- MEMBER CLUSTER INFORMATION Name Version GUID Deployed Deconfigured
CRSCTL Commands for Standalone Oracle Grid Infrastructure Management
crsctl check has crsctl config has crsctl disable has crsctl enable has crsctl query has releaseversion crsctl query has softwareversion crsctl start has crsctl stop has
Identify Node Roles in Oracle Clusterware
crsctl get node role status -all Node 'dbhost1' active role is 'hub' Node 'dbhost1' active role is ‘hub'
Move Voting Disk to Another Disk Group in Oracle Clusterware
crsctl replace votedisk +OCRVD
Successful addition of voting disk 2e4ded6cee504fc8bf078b080fb7be6f. Successful addition of voting disk 8e87826024e24fffbf5add65c011fc66. Successful addition of voting disk e1ba56dedff84fa8bf5605e0302fc81e.
Successful deletion of voting disk 2b7ce864c44d4fecbf60885a188290af. Successfully replaced voting disk group with +OCRVD.
CRS-4266: Voting file(s) successfully replaced
Add a New Voting Disk in Oracle Clusterware
crsctl add css votedisk
Delete a Voting Disk in Oracle Clusterware
crsctl delete css votedisk
====Hence tested and verified in our test env=====