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 Designing Disaster Tolerant HA Clusters Using Metrocluster and Continentalclusters: > Chapter 3 Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with Continuous Access XP

Files for Integrating XP Disk Arrays with Serviceguard Clusters
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Metrocluster is a set of executable programs and an environmental file that work in an Serviceguard cluster to automate failover to alternate nodes in the case of disaster in metropolitan cluster. The Metrocluster/Continuous Access product contains the following files.

Table 3-1 Metrocluster/Continuous Access Template Files

NameDescription
/opt/cmcluster/toolkit/SGCA/xpca.envThe Metrocluster/Continuous Access environmental file. This file must be customized for the specific Disk Array XP Series and HP host system configuration. Copies of this file must be customized for each separate Serviceguard package.

/usr/sbin/DRCheckDiskStatus

The executable module that checks for a specific environment file in the package directory and should not be edited.

/usr/sbin/DRCheckXPCADevGrp

The program that checks the status of the XP/Continuous Access device group that is used by the package.

/usr/sbin/DRMonitorXPCADevGrp

The program that monitors the status of the XP/Continuous Access package device group, sends notification, and performs pre-defined actions on the device group.

 

Metrocluster/Continuous Access needs to be installed on all nodes that will run a Serviceguard package whose data are on an HP StorageWorks Disk Array XP Series, and where the data is replicated to a second XP using the Continuous Access XP facility. In the event of node failure, the integration of Metrocluster/Continuous Access with the package will allow the application to fail over in the following ways:

  • among local host systems attached to the same XP Series array

  • between one system that is attached locally to its XP and another “remote” host that is attached locally to the other XP

Configuration of Metrocluster/Continuous Access must be done on all the cluster nodes, as is done for any other Serviceguard package. To use Metrocluster/Continuous Access, Raid Manager XP host-based software for control and status of the XP Series boxes must also be installed and configured on each HP 9000 or Integrity host system that might execute the application package.



Chapter 3 Building Disaster Tolerant Serviceguard Solutions Using Metrocluster with Continuous Access XP
  		 


Overview of Continuous Access XP Concepts  
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