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 NT
®
Server 4.0, Enterprise Edition,
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 CA
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 CA. 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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