Release 3.2.1 for Windows NT and Windows 2000
Part Number A95197-01
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| Oracle Real Application Clusters Guard Concepts and Administration Guide Release 3.2.1 for Windows NT and Windows 2000 Part Number A95197-01 |
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One of the advantages offered by Oracle Real Application Clusters Guard is its ability to help you easily configure resources in a cluster environment. At times you will need to perform administrative and management tasks on the cluster itself. This chapter discusses topics concerning cluster management, as follows:
| Topic | Reference |
|---|---|
The cluster alias is a node-independent network name that identifies a cluster and is used for cluster-related system management. MSCS creates a group called Cluster Group (which you can view in MSCS Cluster Administrator), and the cluster alias is the virtual address of this group. Oracle Services for MSCS is a resource in the Cluster Group, making it highly available. This ensures that Oracle Services for MSCS is always available to coordinate Oracle Real Application Clusters Guard processing on all cluster nodes.
In an Oracle Real Application Clusters Guard environment, the cluster alias is used only for system management. Oracle Real Application Clusters Guard Manager interacts with the cluster components and MSCS using the cluster alias.
When you connect to a cluster using Oracle Real Application Clusters Guard Manager, you specify the cluster alias, as shown in Figure 4-1. By specifying the cluster alias when you connect to the cluster, you ensure that Oracle Real Application Clusters Guard Manager is connecting to the virtual server where Oracle Services for MSCS is running; the cluster alias is always in the Cluster Group (the same group as Oracle Services for MSCS).
Client applications do not use the cluster alias when communicating with virtual servers. Rather, clients use the virtual address of the group configured for their application.
When you set up a cluster, allocate at least the following number of IP addresses:
For example, a four-node cluster with an instance group on each node requires nine IP addresses: one for each of the four cluster nodes, one for each of the four instance groups (virtual servers), and one for the cluster alias.
See the Oracle Real Application Clusters Guard Installation Guide for more information about allocating IP addresses for your Oracle Real Application Clusters Guard environment.
To accomplish administrative tasks associated with Oracle Real Application Clusters Guard, you need the appropriate privileges to run and use Oracle Services for MSCS and Oracle Real Application Clusters Guard Manager. See the following sections for a detailed description of the requirements for each of the following:
To ensure that only users who have the correct privileges can manage resources in a cluster, Oracle Real Application Clusters Guard implements a security component.
Oracle Services for MSCS runs as a Windows service that must run under a domain user account (not the system account) that has Administrator privileges on all cluster nodes. You specified this user account for Oracle Services for MSCS when you installed Oracle Real Application Clusters Guard. (See the Oracle Real Application Clusters Guard Installation Guide for more information about this part of the installation.)
Oracle Real Application Clusters Guard also has its own security component. Therefore, if you make changes to the Windows user account (user name, password, or domain) used by Oracle Services for MSCS, you must also update the security settings for both the Windows service and Oracle Real Application Clusters Guard. Oracle Real Application Clusters Guard provides a Security Setup tool to update this security information.
Oracle Real Application Clusters Guard provides a Security Setup tool that you can use to update the information for the account under which Oracle Services for MSCS runs. The Oracle Services for MSCS Security Setup tool is installed when you install Oracle Real Application Clusters Guard.
On a cluster node, access the Oracle Services for MSCS Security Setup tool from the Windows taskbar, as follows:
Start -> Programs -> <Oracle_Home> -> Oracle Services for MSCS Security Setup
Figure 4-2 shows the setup for user account Administrator in the domain NEDCDOMAIN.
The account you use to log in to Oracle Real Application Clusters Guard Manager must be a domain user account (not a local account) that has Administrator privileges on all cluster nodes.
Oracle Real Application Clusters Guard supports the multiple Oracle homes feature (multiple Oracle homes became available beginning with Oracle8 release 8.0.4). The following list describes the requirements for using Oracle Real Application Clusters Guard in a multiple Oracle homes environment:
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