Using Serviceguard Extension for RAC, 2nd Edition, February 2005 Update
Table Of Contents
- Using Serviceguard Extension for RAC
- 1 Introduction to Serviceguard Extension for RAC
- 2 Serviceguard Configuration for Oracle RAC
- Planning Database Storage
- Installing Serviceguard Extension for RAC
- Configuration File Parameters
- Creating a Storage Infrastructure with LVM
- Building Volume Groups for RAC on Mirrored Disks
- Building Mirrored Logical Volumes for RAC with LVM Commands
- Creating RAC Volume Groups on Disk Arrays
- Creating Logical Volumes for RAC on Disk Arrays
- Oracle Demo Database Files
- Displaying the Logical Volume Infrastructure
- Exporting the Logical Volume Infrastructure
- Installing Oracle Real Application Clusters
- Cluster Configuration ASCII File
- Creating a Storage Infrastructure with CVM
- Initializing the VERITAS Volume Manager
- Preparing the Cluster for Use with CVM
- Starting the Cluster and Identifying the Master Node
- Converting Disks from LVM to CVM
- Initializing Disks for CVM
- Creating Disk Groups for RAC
- Creating Volumes
- Oracle Demo Database Files
- Adding Disk Groups to the Cluster Configuration
- Using Packages to Configure Startup and Shutdown of RAC Instances
- Starting Oracle Instances
- Creating Packages to Launch Oracle RAC Instances
- Configuring Packages that Access the Oracle RAC Database
- running cluster:adding or removing packages
- Writing the Package Control Script
- Using Serviceguard Manager to Write the Package Control Script
- Using Commands to Write the Package Control Script
- Customizing the Package Control Script
- Optimizing for Large Numbers of Storage Units
- Customizing the Control Script for RAC Instances
- Configuring an Oracle RAC Instance Package
- Using Serviceguard Manager to a Configure Oracle RAC Instance Package
- Enabling DB Provider Monitoring
- 3 Maintenance and Troubleshooting
- Reviewing Cluster and Package States with the
- Managing the Shared Storage
- Removing ServiceGuard Extension for RAC from a System
- Monitoring Hardware
- Adding Disk Hardware
- Replacing Disks
- Replacement of I/O Cards
- Replacement of LAN Cards
- Monitoring RAC Instances
- A Blank Planning Worksheets
Introduction to Serviceguard Extension for RAC
What is a Serviceguard Extension for RAC Cluster?
Chapter 1 17
RAC on HP-UX lets you maintain a single database image that is
accessed by the HP 9000 servers in parallel, thereby gaining added
processing power without the need to administer separate databases.
Further, when properly configured, Serviceguard Extension for RAC
provides a highly available database that continues to operate even if
one hardware component should fail.
Group Membership
Oracle RAC 8.1.x and later systems implement the concept of group
membership, which allows multiple instances of RAC to run on each
node. Related processes are configured into groups. Groups allow
processes in different instances to choose which other processes to
interact with. This allows the support of multiple databases within one
RAC cluster.
A Group Membership Service (GMS) component provides a process
monitoring facility to monitor group membership status. GMS is
provided by the cmgmsd daemon, which is an HP component installed
with Serviceguard Extension for RAC.
Figure 1-2 shows how group membership works. Nodes 1 through 4 of
the cluster share the Sales database, but only Nodes 3 and 4 share the
HR database. Consequently, there is one instance of RAC each on Node 1
and Node 2, and there are two instances of RAC each on Node 3 and
Node 4. The RAC processes accessing the Sales database constitute one
group, and the RAC processes accessing the HR database constitute
another group.