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

2-40 Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide
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Writer: John Blackburn Project: Compaq Parallel Database Cluster Model PDC/O2000 for Oracle8i and Windows 2000 Administrator Guide Comments:
Part Number: 225082-002 File Name: c-ch2 Cluster Architecture.doc Last Saved On: 6/13/01 10:21 AM
Redundant Fibre Channel Arbitrated Loops
A redundant FC-AL refers to the redundant hardware implemented to connect
Fibre Host Adapters to a particular set of shared storage devices in a
PDC/O2000. Each redundant FC-AL consists of the following hardware:
■ Two or more Fibre Host Adapters in each node
■ Two or more Storage Hubs or FC-AL Switches
■ One or more RA4000/RA4100 Arrays, each containing two single-port
RA4000 Array Controllers
■ GBIC-SW modules installed in Fibre Host Adapters, Storage Hubs or
FC-AL Switches, and array controllers to connect Fibre Channel cables
■ Fibre Channel cables used to connect the Fibre Host Adapters to the
Storage Hubs or FC-AL Switches to the array controllers
IMPORTANT: For detailed information about cascading two FC-AL Switches, refer to the
latest Compaq StorageWorks documentation. This guide does not document cascaded
configurations for the FC-AL Switch.
A redundant FC-AL consists of from two to four individual loops, each of
which traverses a single Storage Hub or FC-AL Switch. The number of loops
present is determined by the number of Fibre Host Adapters per node that are
dedicated to the redundant FC-AL: two Fibre Host Adapters per node create
two loops; four Fibre Host Adapters per node create four loops.