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

6 Building Disaster Recovery Serviceguard Solutions Using
Metrocluster with 3PAR Remote Copy
HP 3PAR storage systems allow users to configure data replication solutions to provide disaster
tolerance for Serviceguard clusters over long distances. This chapter describes the HP 3PAR Remote
Copy software and the additional files that integrate the HP 3PAR storage system with Metrocluster.
It also shows how to configure both Metrocluster and Continentalclusters solutions using HP 3PAR
Remote Copy.
The topics discussed in this chapter are:
• Files for Integrating HP 3PAR Storage Systems with Serviceguard Clusters
• Overview of Solution for Metrocluster with 3PAR Remote Copy
• Overview of HP 3PAR Remote Copy Concepts
• Infrastructure Requirements
• Configuring an application in a Metrocluster with 3PAR Remote Copy environment
• Starting the Metrocluster Package
• Administering a Cluster that Uses Metrocluster 3PAR Remote Copy
• Completing and Running a Continentalclusters Solution with 3PAR Remote Copy
• Troubleshooting
Files for Integrating HP 3PAR Storage Systems with Serviceguard Clusters
Metrocluster is a set of executable programs, scripts, and module files that work in a Serviceguard
cluster to automate failover to alternate nodes in case of a disaster occurs in metropolitan cluster.
The Metrocluster with 3PAR Remote Copy product contains the files described in Table 25.
Table 25 Metrocluster with 3PAR Remote Copy product contains the following files.
DescriptionName
Metrocluster binary that checks the status of the 3PAR Remote copy
volume group and performs required failover or failback operations.
/usr/sbin/DRCheck3PARRCGrp
Metrocluster with 3PAR Remote Copy module containing details of the
Metrocluster with 3PAR Remote Copy attributes.
/etc/cmcluster/modules/dts/
mc3parrc.1
Metrocluster with 3PAR Remote Copy module script./etc/cmcluster/scripts/dts/
3parrc.sh
An utility to setup passwordless SSH from the cluster nodes to the 3PAR
storage systems.
/opt/cmcluster/toolkit/SG3PARRC/
utils/setsshkeys
Metrocluster with 3PAR Remote Copy software must be installed on all nodes that will run a
Serviceguard package whose data is on a 3PAR storage system. This data is replicated to a second
3PAR storage system using the 3PAR Remote Copy facility. In the event of a node failure, the
integration between Metrocluster with 3PAR Remote Copy and the package allows the application
to failover in the following ways:
• Among local host systems attached to the same 3PAR storage system.
• Between one host system that is attached locally to its 3PAR storage system and another
“remote” host that is attached locally to the other 3PAR storage system.
Configuration of Metrocluster with 3PAR Remote Copy must be done on all the cluster nodes, as
is done for any other Serviceguard package.
310 Building Disaster Recovery Serviceguard Solutions Using Metrocluster with 3PAR Remote Copy