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

Cluster Architecture 2-45
I/O Data Paths in a Redundant FC-AL
A distinct I/O path connection exists between each Fibre Host Adapter in a
cluster node and every array controller port in each RA4000/RA4100 Array in
the redundant FC-AL.
Fibre Host Adapter-to-Storage Hub/Switch
Paths
Figure 2-18 highlights the I/O data paths that run between the Fibre Host
Adapters and the Storage Hubs or FC-AL Switches in a redundant FC-AL.
Fibre Host
Adapters (2)
RA4000/4100
Array #1
RA4000/4100
Array #2
FC-AL
Switch/Storage
Hub #1
Node 1 Node 2
FC-AL
Switch/Storage
Hub #2
Fibre Host
Adapters (2)
Figure 2-18. Fibre Host Adapter-to-FC-AL Switch/Storage Hub data paths
Secure Path monitors the status of the components along each active path. If
Secure Path detects the failure of a Fibre Host Adapter, Fibre Channel cable,
Storage Hub, or FC-AL Switch along an active path, it automatically transfers
all I/O activity on that path to the components on the defined backup path.