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Install the CRS

Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.

In order to install the CRS, ensure that the nodes have user equivalence. Use rsh or rlogin to test the user equivalence for the account used to install. Usually oracle is the UNIX user account that is used for installation.

In addition to the host machine's public internet protocol (IP) address, obtain two or more IP addresses for each node that is going to be part of the installation for the purpose of VIP. One of the IP addresses must be a public IP address and another for the node's virtual IP address (VIP). Oracle uses VIPs for client-to-database connections. Therefore, the VIP address must be publicly accessible. The other address must be a private IP address for inter node, or instance-to-instance Cache Fusion traffic. Using public interfaces for Cache Fusion can cause performance problems. 

In case of Sun Clusters, install the Oracle-provided UDLM patch onto each node. Install the UDLM patch before installing Cluster Ready Services. Even with a pre-Oracle Database 10g UDLM, install the Oracle Database 10g UDLM.

CRS Installation

To explain the CRS installation process, the following example will be used. A 3 Node Linux Cluster will be referenced that is fitted with polyserve cluster file system.

If installing CRS on a node that already has a single-instance Oracle Database 10g installation, and the ASM instance is running, stop the ASM and CSS daemon by running the $ORACLE_HOME/bin/localconfig delete in the home that is running Cluster Synchronization Services (CSS) to reset the OCR configuration information. 

After CRS is installed, then start up the ASM instances again and the ASM instances will use the cluster CSS daemon instead of the earlier daemon of the single-instance Oracle database. The following steps describe the CRS installation process.

1. Launch the Oracle Universal Installer by using runInstaller command from the /crs subdirectory on the Oracle Cluster Ready Services Release 1 ( CDROM. A welcome page is displayed as shown below:

Figure 6.5: Oracle Universal Installer Welcome Page

2. Next, Select the inventory directory and specify the operating system group name, which is usually the dba. Then execute the script with root privilege as shown in Figure 6.6

Figure 6.6: Inventory Selection Page

3. Next, the Specify Location Page, as shown in Figure 6.7, will be shown. Ensure that the source points to the software location, which is either the software CD directory or the location of the directory where the software is copied. Also specify the CRS Home Name and its location. Cluster Ready Services should be installed in a separate Oracle Home, which is different from the RAC Database Oracle Home. The CRS home directory is the directory where the software for Oracle Cluster Ready Services should be installed.

Figure 6.7: CRS Home Location

4. Make the language selection in the next step. After that, provide a Cluster Name and also the private and public host names for the nodes in the cluster. In this example, Cluster Name is specified as PROD and public node names are shown as node1, node2 and node3. Private host names are shown as rac1-2, rac2-2 and rac3-2. Oracle uses the private Network for Cache Fusion block transfers and inter-node messages. Also note that the Cluster Configuration Information page, shown in Figure 6.8, contains pre-defined node information if the OUI detects that the system has vendor clusterware.

Figure 6.8: Cluster Configuration Page

5. On the next page, identify the interfaces to use as private interconnect. In this example, eth2 has been provided as the private interconnect interface.

Figure 6.9: Private Interconnect Enforcement

6. Next, the Cluster Registry Location Information page is shown. Enter the complete path for the raw device or shared file system file for the Oracle Cluster Registry (OCR). In this example, /mnt/ps/db/ocr has been entered and is located on a cluster file system. The OCR stores the cluster nodes information as shown in Figure 6.10. This file should be about 100MB. In this installation, the Polyserve Cluster file system has been used and the OCR file has been pre-created as shown below.

Figure 6.10: Oracle Cluster Registry Page

Note that at the time of writing of this book, OCFS does not support the CRS files. The CRS files can be located on the following: 1) RAW device. 2) Any Cluster File system other than OCFS. 3) NFS file system on a certified NAS device. However, this situation may change with OCFS Rel 2.0

7. Next, the Voting Disk Information page appears as shown in Figure 6.11. CSS Voting Disk is used to arbitrate the ownership of the cluster nodes in the event of split-brain syndrome. Voting disk is same as the quorum disk, a more familiar term. Voting Disk needs to reside either on a cluster file system or on a shared raw disk. In this installation, a voting disk file css_voting_disk has been pre-created and specified in the voting disk page.

Figure 6.11: Select the CSS Voting Disk

Note that the storage size for the OCR should be at least 100MB and the storage size for the voting disk should be at least 20MB.

8. Next, the OUI displays a dialog asking that the script be run on all of the nodes. After the script processing completes, the OUI displays a Summary page as shown in Figure 6.12.

Figure 6.12: Summary Page for CRS installation


This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters, Rampant TechPress, by Mike Ault and Madhu Tumma.

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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