HP Surestore Disk Array 12h HP SureStore E Disk Array FC60 - (English) Advance - Page 111
point of failure in this topology. If the HP Fibre Channel-AL Hub fails, no communication
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Topology and Array Planning chapter for part numbers). Fibre optic cables longer than 100 m must be custom-fabricated for each implementation. Like the basic topology, both high availability versions (two controller modules per disk array) and non-high availability versions (one controller module per disk array) of this topology can be implemented. For high availability implementations, up to four disk arrays with two controller modules per disk array can be connected to an HP Fibre Channel-AL Hub. The two Fibre Channel I/O adapters installed in the host connect to the two remaining HP Fibre Channel-AL Hub ports. If one controller module fails, ownership of its LUNs can transfer automatically to the remaining operational controller module through the other Fibre Channel adapter. If a primary and an alternate path have been configured in LVM, LVM can switch automatically and transparently to the alternate path. Likewise, if one host adapter fails, or if one Fibre Channel cable from the host to the HP Fibre Channel-AL Hub or from the HP Fibre Channel-AL Hub to one of the dual controller module disk array fails, that disk array can still be accessed via the alternate hardware path. The HP Fibre Channel-AL Hub is a single point of failure in this topology. If the HP Fibre Channel-AL Hub fails, no communication between the host and any of the disk arrays is possible. For non-high availability, up to eight single-controller module disk arrays can be attached to the HP Fibre Channel-AL Hub. If the single controller module or the Fibre Channel cable between the HP Fibre Channel-AL Hub and an array fails, no I/O operations are possible between the host and the disk array with the failed controller module. If one Fibre Channel adapter fails in the host, the disk array can still be accessed via the hardware path through the other operational Fibre Channel adapter. If the HP Fibre Channel-AL Hub fails, no communication between the host and any disk arrays is possible. Topologies for HP-UX 111