Chapter 7: Performance Implications in Cluster Environments

Chapter 7: Performance Implications in Cluster Environments

Overview

Up to this point, I have discussed hardware configurations of both clustered and individual OpenVMS systems. I have also talked about software configurations and tuning issues surrounding OpenVMS systems. I will now talk about the software issues for OpenVMS clusters and how to effectively set up your clusters for efficient processing techniques. This chapter will deal mainly with generic cluster topics and tuning issues. In Chapter 8 , I will talk about performance tools and how to utilize them effectively within a cluster. In Chapter 12 , I will cover topics related to the Alpha and associated clusters. I have separated these topics so that you can quickly and easily reference Alpha-based information.

Quorum

When you form a cluster, it is important to coordinate the cluster resources. There are a number of system applications, called SYSAPS, that help in cluster management. The connection SYSAPS and lock manager SYSAPS are two of the better-known programs that provide some of this needed level of management.

Quorum is a mathematical formula that uses the number of votes that are expected from all of the nodes that are to form a particular OpenVMS cluster. A vote is a number assigned to each cluster member, which indicates how many votes the node will contribute to the ability to successfully form a cluster. A cluster will be successfully formed if enough cluster members have a minimum number of assigned votes to achieve cluster quorum as discussed below.

The...

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