HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 110
Single-System Distance Topology
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Single-System Distance Topology Each instance of the single-system distance topology generally uses the following hardware components: • One host system or server • Two Fibre Channel I/O adapters in each server • One 10-port HP Fibre Channel-AL Hub • One to four dual-controller module disk arrays (for high availability) or One to eight single-controller module disk arrays (for non-high availability) • Maximum 500 m fibre optic cable distance on each connection between the host and the HP Fibre Channel-AL Hub and between the HP Fibre Channel-AL Hub and each disk array, for a total Fibre Channel-AL cable length not to exceed 5000 m One single-system distance topology can be implemented in each D-Class system, one or two single-system topologies can be implemented in each K-Class system, and up to 11 instances of this topology can be implemented in each T-Class server. See your HewlettPackard support representative for the number of adapters and topologies that can be implemented in V-Class systems. This topology uses one 10-port HP Fibre Channel-AL Hub. The two Fibre Channel I/O adapters in the single host attach to two ports in the HP Fibre Channel-AL Hub, providing redundant hardware paths between the host and the HP Fibre Channel-AL Hub. The controller modules of dual or single-controller module disk arrays attach to some or all of the remaining eight HP Fibre Channel-AL Hub ports. This topology creates a single Fibre Channel-AL that resembles a star topology with the HP Fibre Channel-AL Hub acting as the central switching element. The 10-port HP Fibre Channel-AL Hub is inserted between the host and the disk arrays, increasing both the number of arrays (and total disk capacity) that can be connected to a single host and the total length of the Fibre Channel cabling. The HP Fibre Channel-AL Hub is a single point of failure in this topology. 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 110 Topologies for HP-UX