HP Surestore Disk Array 12h and FC60 - Manual (Page 121)

Topologies for HP-UX 121
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Supported cable lengths for each segment of the Fibre Channel-AL include 2 m, 16 m, 50 m,
100 m, and 500 m. The maximum combined cable lengths for all segments, that is, the total
length of the Fibre Channel-AL should not exceed 5000 m because performance can
degrade due to propagation delay. Because of this it is recommended that the total cable
length of the Fibre Channel-AL be as short as possible. Fibre optic cables in lengths of 2 m,
16 m, 50 m, and 100 m cables can be ordered from Hewlett-Packard (see the Reference
chapter for part numbers). Fibre optic cables longer than 100 m must be custom-fabricated
for each implementation.
In this configuration a maximum of nine controller modules can be attached to an HP Fibre
Channel-AL Hub. The HP Fibre Channel-AL Hub’s tenth port is used to connect to the other
HP Fibre Channel-AL Hub in the cascaded pair, rather than to a host adapter as in the high
availability topology.