HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

Testing the configuration
The procedure and commands in this section are based the sample configuration in “XP Cluster
Extension for Linux: Sample configuration” on page 93. Use this procedure as a guide for configuring
your environment.
Test the configuration by migrating the resource group to the remote data center nodes:
1. Verify that the disk pairs are in read-only mode on the remote storage system.
2. In the SLE HA GUI, click Management in the left pane. Right-click the XP Cluster Extension resource
and select Start.
This will bring the resource group online on one of the cluster hosts, based the configured resource
constraints.
3. To migrate the resource, click Management in the left pane. Right-click the XP Cluster Extension
resource, and then select Migrate Resource. Select a target node in the remote data center in the
Migrate Resource dialog box, and then click OK.
4. Verify that the disk pair is in source mode on the remote storage system.
5. Migrate the resource to a node in the same data center and verify that the disk pair status has
not changed.
Managing XP Cluster Extension services (SLE HA)
To manage an XP Cluster Extension resource:
1. Click Management in the left pane of the Linux HA Management Client.
2. Right-click the XP Cluster Extension resource and select Start or Stop to automatically initiate the
requested operation on the each resource in the dependency tree. For more information, see the
SLE HA documentation.
Rescanning multipath devices
IMPORTANT:
The information in this section applies to Device Mapper Multipath Software users only.
When a device group takeover occurs, the permission settings of the LUs in the device group change
from read-only to read-write at the destination site. In Linux configurations with the Device Mapper
Multipath Software, the hosts do not dynamically detect the LU permission change. In this situation,
the disks used in the XP Cluster Extension setup fail to come online when the host OS does not detect
the LU permission change. As a workaround, configure the XP Cluster Extension script
multipath_rescan.sh as a PostExecScript to rescan the disks before they are brought online.
Configuring the rescan script
The multipath rescan script is available in the directory /opt/hpclx/sample/
multipath_rescan.sh. To configure the script to run as a PostExecScript:
Configuring XP Cluster Extension for Linux106