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Introduction
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Elsewhere, see the HP website for locations and telephone numbers.
Introduction
HP Tru64 UNIX storage area network (SAN) administrators use Logical Storage Manager (LSM) to
administer storage on their DRM solution. LSM groups the storage into pools of free space, called disk
groups, which can then be divided into mountable volumes.
This document shows how to administer DRM-based storage under the Logical Storage Manager
Storage Administrator (LSMSA). The LSMSA is a graphical user interface (GUI) that graphically
enables you to import, deport, mount, unmount, and force import volumes.
By creating the volumes, LSM affects how storage is presented to the hosts. This in turn has an impact
on DRM configuration and failover/failback procedures. Specifically, when you execute a failover,
failback, or role reversal procedure, additional steps are necessary to make the volumes visible to the
host. The required steps depend on whether you use the HP DRM Scripting Kit scripts, or the standard
command line interpreter (CLI) commands:
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If you use the scripting kit scripts, see “Augmented Procedures with Scripts” on page 16. These
procedures must be used in addition to some of the failover, failback and role reversal steps found
in the hp StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Scripting User
Guide.
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If you are using CLI commands, see “Augmented Procedures with Command Line Interpreter” on
page 18. These procedures must be used in addition to some of the failover and failback
procedures referred to in the hp StorageWorks Data Replication Manager HSG80 ACS Version
8.7P Failover/Failback Procedures Guide.
Data Replication Manager Overview
Data Replication Manager (DRM) provides a disaster-tolerant solution through the use of hardware
redundancy and data replication across multiple sites. The sites can be near each other or separated by
some distance.
A DRM configuration consists of paired sites. The initiator site carries out primary data processing,
and the data is replicated or mirrored to the target sites. If a significant failure occurs at the initiator
site, data processing can be resumed at the target sites, where the data is intact.
A single DRM configuration requires two HSG80 Array Controller subsystems—one at the initiator or
source site, and one at the target or destination site.
DRM uses the peer-to-peer remote copy function of the HSG80 controller to achieve data replication.
HSG80 controller pairs at the initiator site are connected to their partner HSG80 controller pairs at the
target site. For installations with multiple initiator subsystems, there can be an equal number of unique
target sites, one per pair of initiator controllers.
Mirror copies of LUNs called remote copy sets are created from units at the initiator and target sites.
As data is written to a unit at the initiator site, it is mirrored to its remote copy set partner unit at the
target site.
To achieve disaster tolerance, DRM requires hardware redundancy. In the event of single component
failure at a site, DRM fails over to a redundant component at that site to allow continued operations.
For example, if one of the dual-redundant Fibre Channel links between the sites fails, DRM switches
the data to the other link.
Application Notes – Data Replication Manager with HP Tru64 UNIX Logical Storage Manager
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