Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Physical Data Replication for ContinentalClusters Using EMC SRDF
Overview
Chapter 7326
Overview
Physical data replication with the EMC Symmetrix Disk Array uses the
EMC SRDF environment file template, which is installed in the
/opt/cmcluster/toolkit/SGSRDF directory when you install the
separately purchased product MetroCluster with EMC SRDF. This
directory includes the following files:
• /opt/cmcluster/toolkit/SGSRDF/srdf.env—the EMC SRDF
environment file template. This file must be customized for the
specific EMC Symmetrix and HP 9000 host system configuration.
Copies of this file must be customized for each separate
MC/ServiceGuard package and for each MC/ServiceGuard Cluster.
• /opt/cmcluster/toolkit/SGSRDF/Samples-CC—a directory
containing sample convenience shell scripts that must be edited
before using. These shell scripts may help to automate some
configuration tasks. These scripts are contributed, and not
supported.
• /usr/sbin/DRCheckDiskStatus—The script that checks for a
specific environment file in the package directory and should not be
edited.
• /usr/sbin/DRCheckSRDFDevGrp—The script that checks the status
of the SRDF device group that is used by the package and should not
be edited.
The EMC SRDF environment file template should be used on all
continental cluster nodes and clusters where the following are true:
• The application will run as a primary package on the primary cluster
and, following failover, as a recovery package in the recovery cluster.
• Data are on an EMC Symmetrix ICDA connected to the primary
cluster and replicated with SRDF to a second EMC Symmetrix ICDA
connected to the recovery cluster
NOTE Refer to your Continental Clusters Release Notes for information about
supported hardware, operating systems, and ServiceGuard version.