Starting and Stopping Oracle ASM instance 19c

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Here will see the ASM start and shutdown steps in different methods


  1. ASM Command-Line Utility (ASMCMD)
  2. Sqlplus using sysasm utlity
  3. Server control utility (Srvctl)
  4. Clusterware Control (CRSCTL) Utility
  5. Stop start ASM suing systemctl


Start & Stop using ASM Command-Line Utility (ASMCMD) Utility 

[oracle@oraclelab1 ~]$ asmcmd

ASMCMD> shutdown

ASM diskgroups dismounted

ASM instance shutdown

Connected to an idle instance.

ASMCMD>

 

ASMCMD> startup

ASM instance started

Total System Global Area 1137173320 bytes

Fixed Size                  8905544 bytes

Variable Size            1103101952 bytes

ASM Cache                  25165824 bytes

ASM diskgroups mounted

ASMCMD>


Start & Stop using sqlplus Utlity


[oracle@oraclelab1 ~]$ sqlplus / as sysasm

SQL*Plus: Release 19.0.0.0.0 - Production on Mon Aug 29 13:57:46 2022

Version 19.3.0.0.0


Copyright (c) 1982, 2019, Oracle.  All rights reserved. 

Connected to:

Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production

Version 19.3.0.0.0


SQL> shutdown

ASM diskgroups dismounted

ASM instance shutdown

SQL>

SQL> startup

ASM instance started

Total System Global Area 1137173320 bytes

Fixed Size                  8905544 bytes

Variable Size            1103101952 bytes

ASM Cache                  25165824 bytes

ASM diskgroups mounted

SQL>



 Start & stop using Clusterware Control (CRSCTL) Utility

 I am always using  ASM start and stop crsctl utility.

Check the cluster component status


[oracle@oraclelab1 ~]$ crsctl stat res -t



Stop the High availability services (HAS)

This command attempts to stop resources managed by Oracle Clusterware while attempting to stop Oracle High Availability Services.

[oracle@oraclelab1 ~]$ crsctl stop has


Start the High availability services (HAS) 

This command attempts to start resources managed by Oracle Clusterware while attempting to stop Oracle High Availability Services.


[oracle@oraclelab1 ~]$ crsctl start has


Stop& start ASM Using Server control utility(SRVCTL)

 

SRVCTL stop& start command it will shutdown and start database also.


[oracle@oraclelab1 ~]$ . oraenv

ORACLE_SID = [+ASM] ? +ASM

The Oracle base remains unchanged with value /u01/app/oracle

[oracle@oraclelab1 ~]$ srvctl stop asm -f

[oracle@oraclelab1 ~]$ srvctl start asm -o mount

Stop start ASM using systemctl 

systemctl status oracle-ohasd.service

systemctl stop oracle-ohasd.service

systemctl start oracle-ohasd.service

 

Stop & Start Database Using Server control utility(SRVCTL)

Syntax:-

srvctl stop database -db db_unique_name[-stopoption stop_options]

 

Finding the db unique name 

SQL> show parameter db_unique_name


NAME                         TYPE        VALUE

------------------------------------ ----------- ---------------

db_unique_name            string      TESTCDB


SQL> exit

 

SRVCTL Command

srvctl status database -d TESTCDB

srvctl stop database -d TESTCDB -o immediate

srvctl start database -d TESTCDB -o nomount

srvctl start database -d TESTCDB -o mount

srvctl start database -d TESTCDB -o open

srvctl start database -d TESTCDB


Note:- ASM will not go for open mode only it will open mount mode only. Because ASM don't have any control file.


Understanding of ASM Startup sequence


OS init Daemen process  (init)

Grid Infrastructure Wrapper Script(init.ohasd)

Grid Infrastructure Daemen process

  • ohasd.bin
  • oraagent.bin
  • orarootagent.bin
  • diskmon.bin
  • cssdagent
  • ocssd.bin

ASM Instance

Listener          

DB Instance    

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