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

Cluster Architecture 2-69

Table 2-9

I/O Path Failure and Failover Scenarios in Redundant FC-ALs for Active/Active Configurations

With Two or More RA4000/RA4100 Arrays

continued

Description of Failure Failover Response

A Storage Hub or FC-AL Switch

fails.

Secure Path makes each active array controller to which the failed

Storage Hub or FC-AL Switch is connected inactive. The standby

array controller in each affected RA4000/RA4100 Array becomes

the active array controller. The Storage Hub or FC-AL Switch that is

connected to the new active array controllers becomes the active

I/O path for these RA4000/RA4100 Arrays. In each node, the Fibre

Host Adapter that is connected to the failed Storage Hub or FC-AL

Switch becomes inactive, and all I/O activity is rerouted through the

other Fibre Host Adapter in the pair and the remaining active

Storage Hub or FC-AL Switch.

The Fibre Channel cable

connection between a Storage

Hub or FC-AL Switch and a Fibre

Host Adapter in one node is

broken.

Secure Path makes all I/O path connections between the affected

Fibre Host Adapter and active array controllers inactive. The

standby array controller in every affected RA4000/RA4100 Array

becomes the active array controller. The Storage Hub or FC-AL

Switch connected to the newly active array controllers becomes the

active I/O path for the entire FC-AL. The Storage Hub or FC-AL

Switch connected to the failed Fibre Channel cable becomes

inactive. The second Fibre Host Adapter in each node, which is

connected to the only active Storage Hub or FC-AL Switch,

becomes the only active Fibre Host Adapter in the node’s pair.

A Fibre Host Adapter in a node