Oracle ASM Basic Commands

Below are basic commands used in ASM for day to day activities

To start/enter into ASM command prompt

     hssrvr_prod-+ASM $ asmcmd
     ASMCMD>

To list diskgroups in ASM (asm diskgroups)

hssrvr_prod-+ASM $ asmcmd
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED EXTERN N 512 4096 1048576 307196 307129 0 307129 0 N DATA/
MOUNTED EXTERN N 512 4096 1048576 204798 204743 0 204743 0 N DATA1/
ASMCMD>

To list disks present on server

hssrvr_prod-+ASM $ /etc/init.d/oracleasm listdisks
ASMDISK01
ASMDISK02
hssrvr_prod-+ASM $
hssrvr_prod-+ASM $ asmcmd
ASMCMD> lsdsk
Path
ORCL:ASMDISK01
ORCL:ASMDISK02
ASMCMD> 

To check Cluster Synchronization Services(CSS) status

hssrvr_prod-+ASM $ crsctl check cssd
CRS-272: This command remains for backward compatibility only
Cluster Synchronization Services is online
hssrvr_prod-+ASM $

To check High Availability Services(HAS) status

hssrvr_prod-+ASM $ crsctl check has
CRS-4638: Oracle High Availability Services is online
hssrvr_prod-+ASM $

To Stop High Availability Services

This will shutdown ASM instance, make sure databases are being shutdown before shutting down ASM instance

hssrvr_prod-+ASM $ crsctl stop has

CRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on ‘hssrvr_prod’CRS-2673: Attempting to stop ‘ora.LISTENER.lsnr’ on ‘hssrvr_prod’CRS-2673: Attempting to stop ‘ora.evmd’ on ‘hssrvr_prod’CRS-2673: Attempting to stop ‘ora.DATA.dg’ on ‘hssrvr_prod’CRS-2673: Attempting to stop ‘ora.DATA1.dg’ on ‘hssrvr_prod’CRS-2677: Stop of ‘ora.DATA.dg’ on ‘hssrvr_prod’ succeededCRS-2677: Stop of ‘ora.LISTENER.lsnr’ on ‘hssrvr_prod’ succeededCRS-2677: Stop of ‘ora.DATA1.dg’ on ‘hssrvr_prod’ succeededCRS-2673: Attempting to stop ‘ora.asm’ on ‘hssrvr_prod’CRS-2677: Stop of ‘ora.evmd’ on ‘hssrvr_prod’ succeededCRS-2677: Stop of ‘ora.asm’ on ‘hssrvr_prod’ oracle asmca-2673: Attempting to stop ‘ora.cssd’ on ‘hssrvr_prod’CRS-2677: Stop of ‘ora.cssd’ on ‘hssrvr_prod’ succeededCRS-2793: Shutdown of Oracle High Availability Services-managed resources on ‘hssrvr_prod’ has completedCRS-4133: Oracle High Availability Services has been stopped.hssrvr_prod-+ASM $

To start High Availability Services

hssrvr_prod-+ASM $ crsctl start has
CRS-4123: Oracle High Availability Services has been started.
hssrvr_prod-+ASM $

To Check status of resources (crsctl)

hssrvr_prod-+ASM $ crsctl stat res -t
——————————————————————————–
Name Target State Server State details
——————————————————————————–
Local Resources
——————————————————————————–
ora.DATA.dg
ONLINE ONLINE hssrvr_prod STABLE
ora.DATA1.dg
ONLINE ONLINE hssrvr_prod STABLE
ora.LISTENER.lsnr
ONLINE ONLINE hssrvr_prod STABLE
ora.asm
ONLINE ONLINE hssrvr_prod Started,STABLE
ora.ons
OFFLINE OFFLINE hssrvr_prod STABLE
——————————————————————————–
Cluster Resources
——————————————————————————–
ora.cssd
1 ONLINE ONLINE hssrvr_prod STABLE
ora.diskmon
1 OFFLINE OFFLINE STABLE
ora.evmd
1 ONLINE ONLINE hssrvr_prod STABLE
——————————————————————————–
hssrvr_prod-+ASM $

To start databases and listener, registered with srvctl utility

srvctl start database -d <db_unique_name>
srvctl start listener -l <Listener>

To stop databases and listener, registered with srvctl utility

srvctl stop database -d <db_unique_name>
srvctl stop listener -l <LISTENER>

To check utilization of Diskgroups via sqlplus

SQL> SELECT name, free_mb, total_mb, free_mb/total_mb*100 as percentage FROM v$asm_diskgroup;
NAME FREE_MB TOTAL_MB PERCENTAGE
—————————— ———- ———- ———-
DATA 102345 102398 99.9482412
DATA1 409527 409596 99.9831541

To check disks related to Disk groups

SQL>select dgrp.name dg_name, dgrp.state dg_state, dgrp.type, dsk.disk_number dsk_no,
dsk.path, dsk.mount_status, dsk.state
from v$asm_diskgroup dgrp, v$asm_disk dsk
where dgrp.group_number=dsk.group_number
order by dg_name, dsk_no;
DG_NAME DG_STATE TYPE DSK_NO PATH MOUNT_S STATE
————— ———- —— ———- ————— ——- ——–
DATA MOUNTED EXTERN 0 ORCL:ASMDISK01 CACHED NORMAL
DATA1 MOUNTED EXTERN 1 ORCL:ASMDISK02 CACHED NORMAL

To identify databases using diskgroups managed by ASM instance

select INSTANCE_NAME,DB_NAME,STATUS,SOFTWARE_VERSION from v$asm_client;
INSTANCE_NAME DB_NAME STATUS SOFTWARE_VERSION
——————– ——————– ——————– ————————————————————
TEST1 TEST1 CONNECTED 11.2.0.4.0
+ASM +ASM CONNECTED 12.1.0.2.0
STAGE1 STAGE1 CONNECTED 12.1.0.2.0

To take backup of ASM Diskgroups

md_backup is command to take backup of current diskgroups, it will take backup under /tmp/backup_asm.bck as shown in below example, we can provide any location with -b option

hssrvr_prod-+ASM $ asmcmd
ASMCMD> md_backup -b /tmp/backup_asm.bck
WARNING:option ‘b’ is deprecated for ‘md_backup’
Disk group metadata to be backed up: DATA
Disk group metadata to be backed up: DATA1
Current alias directory path: ASM/PASSWORD
Current alias directory path: ASM
Current alias directory path: ASM/ASMPARAMETERFILE
ASMCMD>

 To restore ASM Diskgroups

    md_restore -b /tmp/backup_asm.bck

Few Other commands

cp – to copy files from one diskgroup to other
rm – to remove files or directories
mkdir – to create directory
pwd – to check current location
cd – to navigate through directories
help – to get syntax and description of asm commands

Comment below if addition information is required