HP Serviceguard manual Package Configuration Planning, Cluster Configuration Next Step

Access Control Policies (also known as Role Based Access)

VOLUME_GROUP

For each policy, specify USER_NAME, USER_HOST, and USER_ROLE. Policies set in the configuration file of a cluster and its packages must not be conflicting or redundant. For more information, see “Setting up Access-Control Policies” (page 194).

The name of an LVM volume group whose disks are attached to at least two nodes in the cluster. Such disks are considered cluster-aware. The volume group name can have up to 39 characters (bytes).

Cluster Configuration: Next Step

When you are ready to configure the cluster, proceed to “Configuring the Cluster ” (page 186). If you find it useful to record your configuration ahead of time, use the worksheet in Appendix E.

Package Configuration Planning

Planning for packages involves assembling information about each group of highly available services.

NOTE: As of Serviceguard A.11.18, there is a new and simpler way to configure packages. This method allows you to build packages out of smaller modules, and eliminates the separate package control script and the need to distribute it manually; see Chapter 6: “Configuring Packages and Their Services ” (page 227) for complete instructions.

This manual refers to packages produced by the newer method as modular packages, and to packages produced by the older method as legacy packages.

The discussion that follows assumes you will be using the modular method. For information and instructions on creating and maintaining older packages, see “Configuring a Legacy Package” (page 302).

The document Framework for HP Serviceguard Toolkits provides a guide to integrating an application with Serviceguard, and includes a suite of customizable scripts intended for use with legacy packages. This document is included in the Serviceguard Developer’s Toolbox, which you can download free of charge from http://www.hp.com/go/softwaredepot.

NOTE: As of the date of this manual, the Framework for HP Serviceguard Toolkits deals specifically with legacy packages.

Logical Volume and File System Planning

NOTE: LVM Volume groups that are to be activated by packages must also be defined as cluster-aware in the cluster configuration file. See “Cluster Configuration Planning ” (page 103). Disk groups (for Veritas volume managers) that are to be activated by packages must be defined in the package configuration file, described below.

You may need to use logical volumes in volume groups as part of the infrastructure for package operations on a cluster. When the package moves from one node to another, it must be able to access data residing on the same disk as on the previous node. This is accomplished by activating the volume group and mounting the file system that resides on it.

In Serviceguard, high availability applications, services, and data are located in volume groups that are on a shared bus. When a node fails, the volume groups containing the applications, services, and data of the failed node are deactivated on the failed node and activated on the adoptive node. In order for this to happen, you must configure the volume groups so that they can be transferred from the failed node to the adoptive node.

Package Configuration Planning 125