Designing Disaster Recovery Clusters using Metroclusters and Continentalclusters, Reprinted October 2011 (5900-1881)

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