How to Deconfigure/Reconfigure(Rebuild OCR) or Deinstall Grid Infrastructure

 

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Why is deconfigure needed?

Deconfigure is needed when:

  • OCR is corrupted without any good backup
  • Or GI stack will not come up on any nodes due to missing Oracle Clusterware related files in /etc or /var/opt/oracle, i.e. init.ohasd missing etc. If GI is able to come up on at least one node, refer to next Section “B. Grid Infrastructure Cluster – One or Partial Nodes”.
  • $GRID_HOME should be intact as deconfigure will NOT fix $GRID_HOME corruption

Steps to deconfigure

Before deconfiguring, collect the following as grid user if possible to generate a list of user resources to be added back to the cluster after reconfigure finishes:

$GRID_HOME/bin/crsctl stat res -t
$GRID_HOME/bin/crsctl stat res -p
$GRID_HOME/bin/crsctl query css votedisk
$GRID_HOME/bin/ocrcheck
$GRID_HOME/bin/oifcfg getif
$GRID_HOME/bin/srvctl config nodeapps -a
$GRID_HOME/bin/srvctl config scan
$GRID_HOME/bin/srvctl config asm -a
$GRID_HOME/bin/srvctl config listener -l <listener-name> -a
$DB_HOME/bin/srvctl config database -d <dbname> -a
$DB_HOME/bin/srvctl config service -d <dbname> -s <service-name> -v

To deconfigure:

  • If OCR and Voting Disks are NOT on ASM, or If OCR and Voting Disks are on ASM but there’s NO user data in OCR/Voting Disk ASM diskgroup:

    On all remote nodes, as root execute:

    # <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose


    Once the above command finishes on all remote nodes, on local node, as root execute:

    # <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose -lastnode


    To reconfigure, run $GRID_HOME/crs/config/config.sh, refer to
    note 1354258.1 for details

  • If OCR or Voting Disks are on ASM and there is user data in OCR/Voting Disk ASM diskgroup:
    • If GI version is 11.2.0.3 AND fix for bug 13058611 and bug 13001955 has been applied, or GI version is 11.2.0.3.2 GI PSU (includes both fixes) or higher:

      On all remote nodes, as root execute:

      # <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose


      Once the above command finishes on all remote nodes, on local node, as root execute:

      # <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose -keepdg -lastnode


      To reconfigure, run $GRID_HOME/crs/config/config.sh, refer to
      note 1354258.1 for details

    • If fix for bug 13058611 and bug 13001955 has NOT been applied:

      On all nodes, as root execute:

      # <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose

      To reconfigure:

      For 11.2.0.1 – deinstall and reinstall with OCR/Voting Disk on a new ASM diskgroup or supported cluster/network filesystem

      For 11.2.0.2 and onward – run $GRID_HOME/crs/config/config.sh and place OCR/Voting Disk on a new ASM diskgroup or support cluster/network filesystem. Refer to note 1354258.1 for more details of config.sh/config.bat

 
 

B. Grid Infrastructure Cluster – One or Partial Nodes

This procedure applies only when all the followings are true:

  • One or partial nodes are having problem, but one or other nodes are running fine – so there’s no need to deconfigure the entire cluster
  • And GI is a fresh installation (NOT upgrad) without any patch set (interim patch or patch set update(PSU) is fine). A direct patch set installation is considered as a fresh installation regardless how long it has been running, as long as there was no Oracle Clusterware running when it is first installed.
  • And cluster parameters have not been changed since original configuration, eg: OCR/VD on same location, network configuration has not been changed etc
  • And $GRID_HOME is intact as deconfigure will NOT fix $GRID_HOME corruption
  • If any of the above is NOT true, node removal/addition procedure should be used

Steps to deconfigure and reconfigure

As root, on each problematic node, execute:

# <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force
# <$GRID_HOME>/root.sh

C. Grid Infrastructure Standalone (Oracle Restart)

Why is deconfigure needed?

Deconfigure is needed when:

  • OLR is corrupted without any good backup
  • GI stack will not come up due to missing Oracle Clusterware related files in /etc or /var/opt/oracle, i.e. init.ohasd is missing etc
  • Nodename needs to be changed

Steps to deconfigure

Before deconfiguring, collect the following if possible:

$GRID_HOME/bin/crsctl stat res -t
$GRID_HOME/bin/crsctl stat res -p
$GRID_HOME/bin/srvctl config asm -a
$GRID_HOME/bin/srvctl config listener -l <listener-name> -a
$DB_HOME/bin/srvctl config database -d <dbname> -a
$DB_HOME/bin/srvctl config service -d <dbname> -s <service-name> -v

To deconfigure:

As root execute:

# <$GRID_HOME>/crs/install/roothas.pl -deconfig -force -verbose

To reconfigure, refer to note 1354258.1

D. Grid Infrastructure Deinstall

As grid user, execute:

$ <$GRID_HOME>/deinstall/deinstall


 For details, refer to the following documentation for your platform:

Oracle Grid Infrastructure
Installation Guide

How to Modify or Deinstall Oracle Grid Infrastructure

If there’s any error, deconfigure the failed GI with steps in Section A – C, and deinstall manually with note 1364419.1

For searchability: recreate OCR, recreate Voting Disk, rebuild OCR

 
 

Sobre Alexandre Pires

ORACLE OCS Goldengate Specialist, OCE RAC 10g R2, OCP 12C, 11g, 10g , 9i e 8i - Mais de 25 anos de experiência na área de TI. Participei de projetos na G&P alocado na TOK STOK, EDINFOR alocado na TV CIDADE "NET", 3CON Alocado no PÃO DE AÇUCAR, DISCOVER alocado na VIVO, BANCO IBI e TIVIT, SPC BRASIL, UOLDIVEO alocado no CARREFOUR e atualmente na ORACLE ACS atendendo os seguintes projetos: VIVO, CLARO, TIM, CIELO, CAIXA SEGUROS, MAPFRE, PORTO SEGURO, SULAMERICA, BRADESCO SEGUROS, BANCO BRADESCO, BASA, SANTANDER, CNJ, TSE, ELETROPAULO, EDP, SKY, NATURA, ODEBRESHT, NISSEI, SICREDI, CELEPAR, TAM, TIVIT, IBM, SMILES, CELEPAR, SERPRO,OKI,BANCO PAN, etc
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