User's Guide

Preparing a Serviceguard Cluster for Metrocluster Continuous Access EVA
When the following procedures are completed, an adoptive node will be able to access the data
belonging to a package after it fails over.
Setting up the Storage Hardware
1. Before configuring Metrocluster Continuous Access EVA, the EVA must be correctly cabled
with redundant paths to each node in the cluster that will run packages accessing data on the
array.
2. Install and configure the hardware components of the EVA, including HSV controllers, disk
arrays, SAN switches, and Management Server.
3. Install and configure CV EVA and SMI-S EVA on the Management Server. For the installation
and configuration process, refer to the HP StorageWorks Command View EVA Installation
Guide.
4. Start CV EVA User Interface (CV EVA-UI). You can configure virtual disks and DR groups using
the CV EVA web user interface shown in Figure 35.
Figure 35 Configuration of Virtual Disks and DR groups
For more detailed information on setting up Command View EVA for configuring, managing
and monitoring your HP StorageWorks Enterprise Virtual Array Storage System, refer to the
HP StorageWorks Command View EVA User Guide.
After a DR group is created, only the source volume (primary volume) is visible and accessible with
Read/Write mode. The destination volume (secondary volume) by default is not visible and
accessible to its local hosts. The destination volume access mode needs to be changed to Read-only
mode before the DR group can be used. The destination volumes need to be presented to its local
host.
NOTE: In the Metrocluster Continuous Access EVA environment, it is required that the destination
volume access mode be set to read-only mode.
The destination Vdisk read-only mode can be changed by using the SSSU command for HP-UX.
When executing the SSSU command, it needs to be executed against the storage cell that holds
the source Vdisk of the DR group.
For users who are not familiar with the SSSU command, an input sample file is provided below
and in the following location: /opt/cmcluster/toolkit/SGCAEVA/Samples/
sssu_sample_input. In the sample file, DC-1 is the name of the source array.
select manager 15.13.244.182 user=administrator pass=administrator
select system DC-1
set DR_GROUP “\Data Replication\DRG_DB1” accessmode=readonly
ls DR_GROUP “\Data Replication\DRG_DB1”
216 Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access EVA