Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide

Cluster Architecture 2-51
Active/Standby Configuration Examples for
Redundant FC-ALs
This section describes examples of active/standby configurations when one,
two, three, four, and five RA4000/RA4100 Arrays are present in one
redundant FC-AL of a four-node PDC/O2000. These examples represent one
method for configuring active/standby configurations. They are presented here
to provide a relatively simple and consistent method for building
active/standby configurations.
IMPORTANT: Figures 2-20 through 2-24 show active/standby configurations for a
four-node cluster. Active/standby configurations for clusters with two, three, five, or more
nodes are not described here. However, the illustrated active/standby configuration
examples provided should supply sufficient information for building an active/standby
configuration in any PDC/O2000 cluster.
The active/standby configuration examples shown in Figures 2-20 through
2-24 follow these configuration guidelines:
■ For every Fibre Host Adapter pair, the top or leftmost Fibre Host
Adapter in each node is connected to the odd-numbered Storage Hub or
FC-AL Switch (Storage Hub/FC-AL Switch #1). This is the active Fibre
Host Adapter in the pair.
■ For every Fibre Host Adapter pair, the bottom or rightmost Fibre Host
Adapter in each node is connected to the even-numbered Storage Hub or
FC-AL Switch (Storage Hub/FC-AL Switch #2). This is the standby
Fibre Host Adapter in the pair.
■ In each RA4000/RA4100 Array, the top (rack model) or right rear
(tower model) array controller is always the active controller.