Guenadi N Jilevski's Oracle BLOG

How to clean up after a failed 11g CRS install. What is new in 11g R2?

How to clean up after a failed 11g CRS install. What is new in 11g R2?

Although it sounds pretty much the same as a previous post How to Clean Up After a Failed 11g CRS Install in Linux
here we are looking at specifics related to Oracle 11g R2.

In Oracle 11g R1 if the Oracle Clusterware installation failed a manual cleanup was required. Steps to re-install Oracle clusterware was:

1. Manually cleanup after the failed Oracle Clusterware install
   
2. Fix the problem
   
3. Restart the Oracle Clusterware installation.
   

In Oracle 11g R2 the installation and configuration are made more flexible and there is a clearer line between installation and configuration. In Oracle 11gR2 a new script roocrs.pl is available to de-configure and clean the Grid Infrastructure installation without removing the binaries. This script also cleans the OCR and vote disks created on ASM. The script allows to clean up the Grid Infrastructure without removing the binaries, fix the problems and re-run root.sh.

Manual Cleanup for RAC 11gR1

The Oracle provided scripts rootdelete.sh and rootdeinstall.sh remove Oracle Clusterware from your system. After running these scripts, run Oracle Universal Installer to remove the Oracle Clusterware home.
The rootdelete.sh script should be run from the Oracle Clusterware home on each node. It stops the Oracle Clusterware stack, removes inittab entries, and deletes some of the Oracle Clusterware files. The rootdeinstall.sh script should be run on the local node only, after rootdelete.sh has been run on all nodes of the cluster. Use this command either to remove the Oracle Clusterware OCR file, or to downgrade your existing installation. If for some reasons there is no access to the scripts look at the post How to Clean Up After a Failed 11g CRS Install in Linux how to remove the inittab entries and Oracle Clusterware. Although the method described in the post applies to Oracle 11g R2 the new tools can suffice most of the time.

What is new in Oracle 11g R2?

In Oracle 11g R2 a tool rootcrs.pl is provided allowing de-configuration without deinstall. After Oracle Clusterware is de-configured we can fix the problem and re-run the root.sh to re-start the Oracle Clusterware configuration.

New deinstall utility removes the binaries from the server in a similar way to OUI in previous Oracle versions.

So if root.sh fails while we install Oracle Grid infrastructure we can gather error messages from the logs, de-configure Oracle clusterware and troubleshoot the reason for the failure. After Oracle Clusterware de-configuration and successful troubleshooting we can proceed further with the configuration re-running root.sh if the problem can be fixed. Thus, in case of errors such as permissions we can save time re-installing Oracle Clusterware binaries. If necessary, we still have an option to completely remove the Oracle Clusterware binaries using the deinstall utility. Prior to running deinstall Oracle Clusterware must be de-configured using rootcrs.pl tool. Successful deinstall preceded by successful de-configure gives a pristine environment to re-start Oracle Grid installation after the failed install is troubleshot based on information gathered examining the logs.

Deconfigure Oracle Clusterware without removing the binaries:

• Log in as the root user on a node where you encountered an error. Change directory to $GRID_HOME/crs/install. For example:
  

  # cd $GRID_HOME/crs/install
  

• Run rootcrs.pl with the -deconfig -force flags on all but the last node.
  

  # perl rootcrs.pl -deconfig -force
  

• If you are deconfiguring Oracle Clusterware on all nodes in the cluster, then on the last node add the –lastnode flag that completes deconfiguration on the cluster including the OCR and the voting disks.
  

  # perl rootcrs.pl -deconfig -force -lastnode
  

Deinstall Command for Oracle Clusterware and ASM

In Oracle 11gR2 binaries cannot be removed using the OUI. Instead Oracle provides deinstall utility. The deinstall utility removes the Oracle clusterware and ASM from the server. The deinstallation Tool (deinstall) stops Oracle software, and removes Oracle software and configuration files on the operating system. It is available in the installation media before installation, and is available in Oracle home directories after installation. It is located in the path $ORACLE_HOME/deinstall. You can use the Deinstallation Tool (deinstall) to remove failed or incomplete installations. It is available as a separate download from the Oracle Technology Network (OTN) Web site.

As the deinstall command runs, you are prompted to provide the home directory of the Oracle software that you want to remove from your system. Provide additional information as prompted. To run the deinstall command from an Oracle grid infrastructure for a cluster home, enter the following command.

$ cd /u01/app/11.2.0/grid/deinstall/ 
$ ./deinstall 

You can generate a deinstall parameter file by running the deinstall command using the -checkonly flag before you run the command to deinstall the home, or you can use the response file template and manually edit it to create the parameter file to use with the deinstall command.

August 12, 2010 - Posted by gjilevski | oracle