Preparing the Cluster for Data Replication

When the following procedures are completed, an adoptive node will be able to access the data belonging to a package after it fails over. Use the convenience scripts in the /opt/cmcluster/ toolkits/SGSRDF/Samples to automate some of the tasks in the following sections:

•mk3symgrps.nodename —to create EMC Symmetrix device groups

•mk4gatekpr.nodename— to create gatekeeper devices

•mk2imports— to import volume groups

•ftpit— to copy the configuration to other nodes in the cluster

•pre.cmquery— to split SRDF links before applying the package configuration

•post.cmapply— to restore SRDF links after applying the package configuration

These scripts should be copied from /opt/cmcluster/toolkits/SGSRDF to another directory, such as /etc/cmcluster/SRDF.

Installing the Necessary Software

Before any configuration can begin, make sure the following software is installed on all nodes:

•Symmetrix EMC Solutions Enabler software allows the management of the Symmetrix disks from the node.

•Symmetrix PowerPath software should be installed if you are building an M by N configuration using PowerPath. However, if you are building an M by N configuration using RDF Enginuity Consistency Assist (RDF-ECA), you need to install only Symmetrix EMC Solutions Enabler. You do not have to install any other software.

•Metrocluster with Symmetrix SRDF should be installed according to the instructions in the Metrocluster with EMC SRDF Release Notes.

NOTE: For Metrocluster/SRDF version A.05.01 and earlier, M by N configurations using PowerPath only are supported. As a result, the PowerPath software is a prerequisite for using an M by N configuration with Metrocluster.

Building the Symmetrix CLI Database

The Symmetrix CLI (Command Line Interface) should be installed on all nodes running packages that use data on the EMC Symmetrix disk arrays. Create the EMC Solutions Enabler database on each system using the following steps. (Refer to the Symmetrix EMC Solutions Enabler manual).

Issue the following command on each node after the hardware is installed.

#symcfg discover

This builds the CLI database on the node.

Display what is in the EMC Solutions Enabler database.

•symdg list

•symld -g symdevgrpname list

•symgate list

If the EMC Solutions Enabler database is not configured, the following error message will be displayed:

The Symmetrix configuration could not be loaded for a locally attached Symmetrix

Preparing the Cluster for Data Replication 257