5 Building Disaster Recovery Serviceguard Solutions Using Metrocluster with EMC SRDF

The EMC and Symmetrix Remote Data Facility (EMC SRDF) disk arrays allows configuration of physical data replication solutions to provide disaster tolerance for Serviceguard clusters over long distances. This chapter describes the EMC SRDF software and the additional files that integrate the EMC with Serviceguard clusters. It then shows how to configure both metropolitan and Continentalclusters solutions using EMC SRDF.

The topics discussed in this chapter are:

•Files for Integrating Serviceguard with EMC SRDF

•Overview of EMC and SRDF Concepts

•Preparing the Cluster for Data Replication

•Building a Metrocluster Solution with EMC SRDF

•Metrocluster with SRDF/Asynchronous Data Replication

•Metrocluster with SRDF/Asynchronous Multi-Session Consistency Data Replication

•Building Continentalclusters Solution with EMC SRDF

Metrocluster also defines a Site Aware Disaster Tolerant Architecture for complex workloads such as Oracle RAC database, including Oracle 10gR2 RAC, Oracle 11gR1 RAC, Oracle 11gR2 RAC, and SAP. This solution uses an additional software feature called the Site Controller Package to provide disaster tolerance for workload databases. For more information on the site aware disaster tolerant architecture, see “Overview of Site Aware Disaster Tolerant Architecture” (page 337).

Files for Integrating Serviceguard with EMC SRDF

Metrocluster is a set of executable programs, scripts and an environment file that work in an Serviceguard cluster to automate failover to alternate nodes in the case of disaster in a metropolitan cluster. The Metrocluster with EMC SRDF product contains the following files:

Table 21 Metrocluster with EMC SRDF Template Files

Name

Description

 

 

/opt/cmcluster/toolkit/SGSRDF/srdf.env

The Metrocluster with EMC SRDF environmental file. This

 

file must be customized for the specific EMC Symmetrix,

 

and HP 9000 and, HP Integrity Servers host system

 

configuration. Copies of this file must be customized for

 

each separate Serviceguard package.

 

 

/opt/cmcluster/toolkit/SGSRDF/samples

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 program that manages the SRDF device group that

 

is used by the package.

 

 

Metrocluster with EMC SRDF has to be installed on all nodes that will run a Serviceguard package that accesses data on an EMC Symmetrix where the data are replicated to a second Symmetrix

Files for Integrating Serviceguard with EMC SRDF 255