Problem Description
While installing oracle clusterware on Red Hat Enterprise Linux 5.0 at then end of the installation of Cluster Ready Services OUI prompts for the $CRS_HOME/root.sh script to be run on all
of the nodes in the cluster. The fact is when the root.sh script is run on the last node in
the cluster, the script calls the VIPCA utility which fails in RHEL 5. The same failure occurs on Red Hat Enterprise Linux 5.0, and SUSE Linux Enterprise Linux 10.
Solution of The Problem
As a workaround to solve the problem before running the root.sh script on the last node in the cluster,
alter the $CRS_HOME/bin/vipca script commenting out lines 119 through 123:
arch=’uname -m’
# if [ "$arch" = "i686" -o "$arch" = "ia64" -o "$arch" = "x86_64" ]
# then
# LD_ASSUME_KERNEL=2.4.19
# export LD_ASSUME_KERNEL
# fi
After commenting out run root.sh and it should be able to call VIPCA successfully.
But don't comment out the line 118 that is arch=’uname -m’ as it is needed by the root.sh script to set the arch variable.
Related Documents
Installing Clusterware through OUI fails Cheking OS version in RHL-5
Showing posts with label Clusterware. Show all posts
Showing posts with label Clusterware. Show all posts
Tuesday, September 9, 2008
Wednesday, August 20, 2008
Major Oracle Clusterware components
The Oracle Clusterware comprises several background processes that facilitate cluster operations. These processes or components are the main communication links between the Oracle Clusterware high availability components and the Oracle Database as well as they monitor and manage database operations.
Here is the list of major oracle clusterware components or processes.
1)Cluster Synchronization Services (CSS): It manages and controls which nodes are members of the cluster and notify members when a node joins or leaves the cluster.
2)Cluster Ready Services (CRS): It manages high availability operations within a cluster. The CRS process start, stop, monitor and failover operations. It generates events when a resource status changes. When you have installed Oracle RAC, crs monitors the Oracle instance, Listener, and so on, and automatically restarts these components when a failure occurs.
3)Event Management (EVM): It is a background process that publishes events that crs creates.
4)Oracle Notification Service (ONS): It publishes and subscribes service for communicating Fast Application Notification (FAN) events.
5)RACG: It runs server callout scripts when FAN events occur.
6)Process Monitor Daemon (OPROCD): This process is locked in memory to monitor the cluster and provide I/O fencing. OPROCD performs its check, stops running, and if the wake up is beyond the expected time, then OPROCD resets the processor and reboots the node. An OPROCD failure results in Oracle Clusterware restarting the node. OPROCD uses the hangcheck timer on Linux platforms.
Here is the list of major oracle clusterware components or processes.
1)Cluster Synchronization Services (CSS): It manages and controls which nodes are members of the cluster and notify members when a node joins or leaves the cluster.
2)Cluster Ready Services (CRS): It manages high availability operations within a cluster. The CRS process start, stop, monitor and failover operations. It generates events when a resource status changes. When you have installed Oracle RAC, crs monitors the Oracle instance, Listener, and so on, and automatically restarts these components when a failure occurs.
3)Event Management (EVM): It is a background process that publishes events that crs creates.
4)Oracle Notification Service (ONS): It publishes and subscribes service for communicating Fast Application Notification (FAN) events.
5)RACG: It runs server callout scripts when FAN events occur.
6)Process Monitor Daemon (OPROCD): This process is locked in memory to monitor the cluster and provide I/O fencing. OPROCD performs its check, stops running, and if the wake up is beyond the expected time, then OPROCD resets the processor and reboots the node. An OPROCD failure results in Oracle Clusterware restarting the node. OPROCD uses the hangcheck timer on Linux platforms.
Tuesday, August 12, 2008
Overview of Oracle Clusterware and Oracle RAC
In a database whenever you query from V$database to know the name of the database and want to know the name of the instance from v$thread they return similar result. Suppose,
SQL> select name from v$database;
NAME
---------
DBASE
SQL> select instance from v$thread;
INSTANCE
--------------------------------------------------------------------------------
dbase
which indicates in the database there is only one instance that is database have a one-to-one relationship between datafiles and the instance. Oracle RAC environments, however, have a one-to-many relationship between datafiles and instances. In RAC environments multiple instances form a single database. The instances can reside on different servers which is referred as nodes in RAC environment.
• In RAC environment the set of interconnected instances that allows the servers to work together is called cluster. The physical structures that make up the database must reside on shared storage that is accessible from all servers that are part of the cluster. Each server in the cluster runs the Oracle RAC software.
• In RAC database each instance has its own memory and background processes but every instances share the same data files. So while any data need to write or retrieve they use the same datafiles but each instance use it's own memory.
Now question is if one instance read data and modify it in the buffer cache and if another instance need that data then how oracle manages it?
• In RAC Oracle uses Cache Fusion Technology to synchronize the data stored in the buffer cache of each cluster database instance. Cache Fusion moves current data blocks (which reside in memory) between database instances, rather than having one database instance write the data blocks to disk and requiring another database instance to reread the data blocks from disk.
• When a data block is needed for one instance which resides in the buffer cache of another instance, Cache Fusion transfers the data block directly between the instances using the interconnect, enabling the Oracle RAC database to access and modify data as if the data resided in a single buffer cache.
Oracle RAC provides high availability and scalability.
If one instance fails in RAC environment still another instance can do the task and thus prevents the server from being a single point of failure.
In a RAC environment transactions are distributed over multiple instances. Thus minimize load from one instance.
• Never mix with oracle clusterware with Oracle RAC. The Oracle Clusterware is software that when installed on servers, enables the servers to be bound together to operate as if they were one server. Before you install oracle RAC you need to install clusterware. Without clusterware you can't install oracle RAC.
SQL> select name from v$database;
NAME
---------
DBASE
SQL> select instance from v$thread;
INSTANCE
--------------------------------------------------------------------------------
dbase
which indicates in the database there is only one instance that is database have a one-to-one relationship between datafiles and the instance. Oracle RAC environments, however, have a one-to-many relationship between datafiles and instances. In RAC environments multiple instances form a single database. The instances can reside on different servers which is referred as nodes in RAC environment.
• In RAC environment the set of interconnected instances that allows the servers to work together is called cluster. The physical structures that make up the database must reside on shared storage that is accessible from all servers that are part of the cluster. Each server in the cluster runs the Oracle RAC software.
• In RAC database each instance has its own memory and background processes but every instances share the same data files. So while any data need to write or retrieve they use the same datafiles but each instance use it's own memory.
Now question is if one instance read data and modify it in the buffer cache and if another instance need that data then how oracle manages it?
• In RAC Oracle uses Cache Fusion Technology to synchronize the data stored in the buffer cache of each cluster database instance. Cache Fusion moves current data blocks (which reside in memory) between database instances, rather than having one database instance write the data blocks to disk and requiring another database instance to reread the data blocks from disk.
• When a data block is needed for one instance which resides in the buffer cache of another instance, Cache Fusion transfers the data block directly between the instances using the interconnect, enabling the Oracle RAC database to access and modify data as if the data resided in a single buffer cache.
Oracle RAC provides high availability and scalability.
If one instance fails in RAC environment still another instance can do the task and thus prevents the server from being a single point of failure.
In a RAC environment transactions are distributed over multiple instances. Thus minimize load from one instance.
• Never mix with oracle clusterware with Oracle RAC. The Oracle Clusterware is software that when installed on servers, enables the servers to be bound together to operate as if they were one server. Before you install oracle RAC you need to install clusterware. Without clusterware you can't install oracle RAC.
Wednesday, April 16, 2008
ORA-29702 error occurred in Cluster Group Service operation
Error Description:
-----------------------
Previously I had RAC setup environment on my database. Now I want to install non RAC database instance.When I create my database using DBCA it fails to create database by returning ORA-29702 error Cluster Group Service operation. Though I have not selected the option to create RAC database but the error produce.
This error also occurs whenever you startup a Non-RAC database.
Reason:
---------
Though RDBMS install is not running on RAC but still it is assuming it to be RAC instance.
Solution
-------------
Relink with the RAC OFF. In my Solaris environment I just relink RAC OFF by following commands.
1)cd $ORACLE_HOME/rdbms/lib
2)/usr/ccs/bin/make -f ins_rdbms.mk rac_off
3)make -f ins_rdbms.mk ioracle
4)Try to re-create database with dbca and you will see your problem has gone.
-----------------------
Previously I had RAC setup environment on my database. Now I want to install non RAC database instance.When I create my database using DBCA it fails to create database by returning ORA-29702 error Cluster Group Service operation. Though I have not selected the option to create RAC database but the error produce.
This error also occurs whenever you startup a Non-RAC database.
Reason:
---------
Though RDBMS install is not running on RAC but still it is assuming it to be RAC instance.
Solution
-------------
Relink with the RAC OFF. In my Solaris environment I just relink RAC OFF by following commands.
1)cd $ORACLE_HOME/rdbms/lib
2)/usr/ccs/bin/make -f ins_rdbms.mk rac_off
3)make -f ins_rdbms.mk ioracle
4)Try to re-create database with dbca and you will see your problem has gone.
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