HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 104

For high availability the hosts and disk arrays can be connected in any of the following ways, with each connection of adapter and controller module creating a separate 2-node Fibre Channel-AL: • One disk array with two controller modules with each controller module connected to a separate adapter in a single host • In K-Class and T-Class systems, two disk arrays with two controller modules per array, connected to a single host with four Fibre Channel adapters. The high availability version uses disk arrays having two (redundant) controller modules. Each controller module is connected to a separate adapter. The two adapters can be installed in one host or each adapter can be installed in a different host. Disk arrays having redundant controller modules protect against single points of hardware failure by providing an alternate hardware path to the host if an controller module, Fibre Channel cable, host Fibre Channel I/O adapter, or internal Ultra2 SCSI bus fails. Applications can continue to run after the failure of a single disk module. This is explained in the "Disk Array High Availability Features" section in chapter 1. Figure 35 shows the high availability version of the basic topology implemented on a host system with two host Fibre Channel I/O adapters connected to a dual-controller module disk array. One high availability version of the basic topology can be implemented in DClass servers. Note Connecting multiple hosts to the Disk Array FC60 requires the use of Fibre Channel-AL hubs. Connecting the host through hubs preserves high-availability in the event of a host adapter failure. 104 Topologies for HP-UX