Building Disaster Recovery Serviceguard Solutions Using Metrocluster with 3PAR Remote Copy

synchronization is manually initiated. If between two synchronizations, an area of the volume is
written to multiple times, only the last write needs to be synchronized with the other storage system.
Remote Copy target definitions
As part of the Remote Copy setup process, you must create target definitions on each Remote Copy
system. The target definitions are descriptions that exist on one system to identify a Remote Copy
system. For example, the 3PAR storage systems in the Remote Copy pair are each defined as
targets, relative to each other, for Remote Copy operations.
Virtual domains
The HP 3PAR Virtual Domains facility enables finer grain privileges over system objects, such as
volumes and hosts. Domains allow an administrator to create up to 1024 domains or spaces within
a 3PAR storage system, where each domain is dedicated to a specific application. A subset of the
3PAR storage system users has varying privileges over the domains. Domains can be useful where
a single storage system is used to manage data from several different independent applications.
Each domain provides users with various levels of accessibility domain objects. A domain is made
of Common Provisioning Groups (CPGs), hosts, and Remote Copy groups. Domains contain derived
domain objects, such as Virtual Volumes (VVs), Logical Disks (LDs), and volume exports (VLUNs).
Because objects are domain-specific, domain users cannot accidentally or deliberately export VVs
to hosts or access VVs outside their assigned domain. Remote Copy checks for HP 3PAR Virtual
Domains (domains) on the remote system to ensure the virtual volume is mirrored to the same
domain name as the local domain name.
For additional information about Domains, see the HP 3PAR InForm OS Concepts Guide.
HP 3PAR user privileges
There are different roles available for users created on the 3PAR storage systems. The roles available
varies based on the version of Inform OS installed on the array.
For more information, see the 3PAR InForm OS Concepts Guide and 3PAR Remote Copy User
Guide available at: http://www.hp.com/go/saw or contact your HP representative.
Overview of solution for Metrocluster with 3PAR Remote Copy
Infrastructure requirements
To configure any application in a Metrocluster with 3PAR Remote Copy environment, verify the
following infrastructure requirements:
• Ensure that the port number used by HP-UX Secure Shell or OPENSSH is open for
communication across two sites. Nodes in both the sites must be able to communicate over
the network.
• The Remote Copy links must be available between the 3PAR storage systems. The method to
set the Remote copy links depends on whether the configuration uses Remote Copy over IP
(RCIP) or Remote Copy over Fiber Channel (RCFC). There must be at least two alternately
routed Remote Copy links between the storage systems to maintain availability. In Metrocluster
with 3PAR Remote Copy, bidirectional configuration must be used. For more information on
setting up the Remote Copy links, see 3PAR Remote Copy User Guide available at: http://
www.hp.com/go/saw or contact your HP representative.
• Each node in the Metrocluster must have TCP/IP connectivity to both local and remote 3PAR
storage systems. HP recommends you to provide redundant network paths between the cluster
nodes and the 3PAR storage systems.
8 Introduction