Compaq ProLiant Cluster HA/F500 Administrator Guide

Overview of the ProLiant Cluster HA/F500
1-6 ProLiant Cluster HA/F500 for MA8000 Administrator Guide
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: b-ch1
Codename: Chargers Part Number: 355220-006 Last Saved On: 7/26/02 2:46 PM
Enhanced Configuration with Hubs
Figure 1-3 shows a configuration without any single points of failure. It improves on
the basic configuration shown (see Figure 1-2) by adding a second host bus adapter
in each server and a second hub. The combination of second adapter, hub, and
controller form a second independent path to the storage subsystem.
To allow dual paths to the storage, the Secure Path software must be installed on
both servers. With Secure Path, data can flow simultaneously over both host bus
adapters to the storage subsystem, and static load balancing can be performed over
the two paths to help maximize performance.
NOTE: The dashed lines indicate maximum configuration.
Fibre Channel
Storage Hub
Fibre Channel
Storage Hub
Interconnect
LAN
Host Bus
Adapters
Host Bus
Adapters
ProLiant
Server
ProLiant
Server
Port 1 Active
Port 1 Active
Controller A
Controller B
Storage
Subsystem
Controller A
Controller B
Storage
Subsystem
Figure 1-3: Enhanced configuration with hubs
A component failure in this cluster will result in a failover to a second component,
and the end user can continue using the cluster. Some typical failures and responses
in the enhanced configuration include:
• A server failure will cause Microsoft cluster software to fail over to the second
server.
• A host bus adapter failure will cause subsequent data requests intended for the
failed adapter to be routed over the remaining good adapter.