HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 115
High Availability Topology
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Topology and Array Planning High Availability Topology The high availability topology increases the availability of the single system distance topology by protecting against single points of HP Fibre Channel-AL Hub failure with the use of redundant HP Fibre Channel-AL Hubs connected to each other. Adding a second HP Fibre Channel-AL Hub also increases the number of hosts and disk arrays that can be connected to a single Fibre Channel-AL. Each instance of the high availability topology uses the following hardware components: • Two to four host systems or servers • Two Fibre Channel I/O adapters per host • Two 10-port HP Fibre Channel-AL Hubs • Two controller modules per disk array • Maximum of six dual-controller module disk arrays in a four-host Fibre Channel-AL or Maximum of eight dual-controller module disk arrays in a two-host Fibre Channel-AL • Maximum 500 m fibre optic cable distance on each connection between each host and HP Fibre Channel-AL Hub and between each HP Fibre Channel-AL Hub and disk array, for a total Fibre Channel-AL cable length not to exceed 5000 m As its name implies, the high availability topology supports only dual-controller module disk arrays (Figure 39). The objective of this topology is to use redundant hardware components to provide high availability, so disk arrays with single controller modules are not supported. All hardware components and paths are redundant. If any hardware failure occurs, I/O communication between host and disk array can be completed through another path. In this topology each host uses two Fibre Channel I/O adapters and each disk array uses dual controller modules. One adapter in each host and one controller module in each disk array connect to one HP Fibre Channel-AL Hub, forming one Fibre Channel-AL. The second adapter in each host and the second controller module in each disk array connect to the second HP Fibre Channel-AL Hub, cabled into a separate Fibre Channel-AL. This creates two redundant Fibre Channel-ALs. Topologies for HP-UX 115