11g R2 RAC : DELETE A NODE

11g R2 RAC has extremely simplified the process of deleing a node to the cluster as compared to 10g RAC or 11g R1 RAC.  To know the  procedure to delete a node in 10g RAC or 11g R1 RAC pls click here.

Now, after the introduction of SCAN and GPNP, we need to follow very simple steps.

Current scenario:

I have three nodes in the cluster presently.

Host names :

- host01.example.com

- host02.example.com

-  host03.example.com

Node to be deleted : 

- host03.example.com

Procedure:

– Login as root on the node(s) to be deleted(host03) navigate to  <gridhome>/crs/install

 

[root@host03]#cd /u01/app/11.2.0/grid/crs/install

 

– Disable oracle clusterware applications and applications  on the node (host03) 

 

[root@host03]#./rootcrs.pl -deconfig  -force

 

– From a node that will remain(host01) , delete the node

 

root@host01]#crsctl delete node -n host03

 

– on a node that will remain , login as grid user, navigate to gridhome/oui/bin and update node list

   

[grid@host01]$cd /u01/app/11.2.0/grid/oui/bin

 

 [grid@host0$]./runInstaller -updateNodeList ORACLE_HOME=/u01/app/11.2.0/grid “CLUSTER_NODES={host01,host02}”

 

 

– check that only nodes 1 and 2 remain

 

$crsctl stat res -t