RedHat Linux OS upgradation on Oracle 11gR2 RAC environment

Hi Guys, Two months before I was performed Linux OS upgradation on live production and test environment for one of my big client. Both environments are 2 node RAC configured.

I followed below mentioned steps for OS upgradation,

OS Upgrade Pre-requisites Steps:-

 > Kindly cross check with Oracle and RedHat for license certification matrix

 > Take fullbackup of OS and Database.

OS Upgrade Steps:-

(1) Shutdown DB, DBconsole (if any), Cluster, ASMlib (if any in Linux)

As RDBMS owner id “oracle”:

$ srvctl stop database -d -o immediate #– run once in any node

$ emctl stop dbconsole #– run on all nodes

As UNIX/Linux “root”:

# /bin/crsctl stop crs #– run on all nodes

# /bin/crsctl disable crs #– run on all nodes

# /etc/init.d/oracleasm stop #– run on all nodes

# /etc/init.d/oracleasm disable #– run on all nodes

(2) Backup filesystem for GRID ORACLE_HOME & RDBMS ORACLE_HOME

(3) Upgrade RedHat OS

    > configure RHN (Give Rhn_register command thru root user).

    > You have to give Redhat login user/password and your proxy address & port.

    > RHN will collect your system information then will send that to redhat network.

    > Once RHN configured then give command like #yum update --no plugin (or yum update)

    > It will download latest packages from redhat repository and install automatically, final stage the OS will ask you for reboot the machine.

    > After reboot you can get the latest kernal (using this command check the kernal and redhat os version #uname-a, cat /etc/redhat-release)

(4) Upgrade ASMlib (Download ASM packages based on latest kernal version)

# rpm -Uvh oracleasm-support-xxx

# rpm -Uvh oracleasm-2.6.xxx

# rpm -Uvh oracleasmlib-xxx

# /etc/init.d/oracleasm enable

# /etc/init.d/oracleasm lisdisks

(5) Relink RDBMS ORACLE_HOME Binary

Note: complete full steps in one node, then proceed to next

As RDBMS owner id “oracle”:

$ /bin/relink all

(6) Relink GRID ORACLE_HOME Binary

Note: complete full steps in one node, then proceed to next

As UNIX/Linux “root”:

# cd /crs/install

# ./rootcrs.pl -unlock

As RDBMS owner id “oracle”:

$ cd /bin

$ ./relink all

As UNIX/Linux “root”:

# cd /rdbms/install

# ./rootadd_rdbms.sh

# cd /crs/install

# ./rootcrs.pl –patch

(7) Enable CRS auto-startup and start CRS on all nodes

Note: complete full steps in one node, then proceed to next

As UNIX/Linux “root”:

# /bin/crsctl start crs

# /bin/crsctl enable crs

(8) Double check if DB, instances and all resrouces are ONLINE.

As RDBMS owner id “oracle”:

$ crsctl stat res -t

Reference :: How to Check Whether Oracle Binary/Instance is RAC Enabled and Relink Oracle Binary in RAC [ID 284785.1]

Kindly share your valuable comments... :-)