HP ProLiant Cluster HA/F500 for Enterprise Virtual Array Enhanced DT Supplement Guide

Introduction
Disaster Tolerance
Disaster-tolerant solutions provide high levels of availability with rapid data access
recovery, no single point of failure, and continued data processing after the loss of
one or more system components in a cluster configuration. Data is simultaneously
written to both local and remote sites during normal operation. The local site is
known as the source site because it is in control of the operation. The remote site
is known as the destination site because it is where the information is copied.
Copied data resides at both the source and destination sites. However, in base DT
cluster configurations under normal conditions, host data access occurs only through
the source site. Processing will migrate to the destination site and continue normal
operation if a component failure or a catastrophe occurs at the source site.
Product Description
The HP ProLiant Cluster HA/F500 for EVA Enhanced DT configuration is
a two-node cluster for Microsoft® Windows® 2000 Advanced Server or a
two-to-eight-node cluster for Microsoft Windows Server 2003, Enterprise Edition.
The DT configurations use HP ProLiant servers, HP StorageWorks storage
subsystems, HP StorageWorks Continuous Access software, HP OpenView
software, and HP StorageWorks Secure Path software.
This solution combines the failover functionality of Microsoft Cluster Server
(MSCS) with the remote data mirroring functionality of Continuous Access. This
solution also allows for a distance of up to 100 km between a primary (local)
external storage subsystem and a mirrored (remote) external storage subsystem. The
server-to-storage connection is based on a Fibre Channel switch, using a shortwave
connection, and server-to-server communication, using Ethernet over Fibre Data
Distributed Interface (FDDI) or Fibre Channel over Internet Protocol (FCIP)
connections. The extended Continuous Access EVA-over-IP configuration is similar
to the simple Continuous Access EVA configuration except for the use of Fibre
Channel-to-IP gateways. Two gateways are required at each site, one per fabric, for
a total of four per solution, dedicated to that solution. When multiport gateways
become available, each port must be dedicated to another single port.
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