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Caché ECP Clusters on Red Hat

Enterprise Linux

Caché ECP Clusters is a high availability feature that enables failover from one ECP data

server to another, using operating system level clustering to detect a failed server. Caché ECP

Clusters technology has been tested and is supported on Red Hat Enterprise Linux AS version

4. This document contains details of how to conﬁgure the cluster and is organized into the

following sections:

• Pre-installation Planning

• Conﬁguring the Cluster Services for Caché

• Conﬁguring the Second Node

• Adding Caché to the Cluster Services

• Maintaining the Caché Registry When Upgrading

For detailed information on conﬁguring the cluster on the Red Hat Enterprise Linux, see the

Red Hat Cluster Suite, Conﬁguring and Managing a Cluster, at the Red Hat Web site.

1 Pre-installation Planning

This section outlines the requirements for conﬁguring the cluster system. Subsequent sections

describe the steps to install, deﬁne, and conﬁgure the various components of the cluster. To

plan the process for setting up the cluster system, ﬁrst determine whether the conﬁguration

is a hot-standby conﬁguration or an active-active conﬁguration. In a hot-standby conﬁguration

only one node is running Caché at a time.

In an active-active conﬁguration each node is running its own instance of Caché. The nodes

do not have direct access to the same databases; each database is assigned to one Caché

instance or the other. You can network the Caché instances with ECP and use namespace

deﬁnitions to project the same data from both nodes.

An active-active conﬁguration requires the following tasks:

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