Compaq ProLiant Cluster HA/F500 Administrator Guide

Overview of the ProLiant Cluster HA/F500
ProLiant Cluster HA/F500 for MA8000 Administrator Guide 1-19
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: b-ch1
Codename: Chargers Part Number: 355220-006 Last Saved On: 7/26/02 2:46 PM
The storage controllers can be configured as follows:
• For the basic configuration using one controller, the single storage controller is
configured as active. The storage controller is connected through a fiber optic
cable to the hub or switch.
• For the basic configuration using two storage controllers, the controllers are
configured in transparent mode. In transparent mode, one controller is configured
as active, and the second controller is configured as standby. All data requests
pass through the active controller. If the active controller fails, the standby
controller becomes active and takes over the role of the failed controller. Both
storage controllers are connected through fiber optic cables to different ports on
the same hub or switch.
• For the enhanced configuration, both storage controllers are configured as active,
but access to a logical unit (LUN) is restricted to either port 1 or port 2 to ensure
data integrity. In this configuration, both storage controllers are receiving and
transmitting data, increasing the data throughput for the cluster over the basic
configuration. If the first controller fails, the other storage controller takes over
the role of the failed controller, in addition to its own, and continues operation.
Port N (where N=1 or 2) on one storage controller is connected through a fiber
cable to one port on a hub or switch; port N on the other storage controller is
connected to the second hub or switch. Connecting the storage controllers in this
manner provides two independent paths to the storage subsystem.