HP Surestore 64 Planning Guide - Page 23

Director Features In addition to performance features and out-of-band management, the director provides: • High-availability features. • Connectivity features. • Security features. • Serviceability features. High-Availability Features Pairs of critical field-replaceable units (FRUs) installed in the director provide redundancy in case a FRU fails. When an active FRU fails, the backup FRU takes over operation automatically (failover) to maintain director and Fibre Channel link operation. Note FPM cards do not automatically fail over and provide link operation after a failure. Fiber-optic cables from the failed FPM card must be disconnected and reconnected to ports on a spare card to continue operation. A standard high-availability director provides the following dual sets of FRUs and spare (unused) ports on FPM cards. • CTP cards The director contains two CTP cards. The redundant CTP card provides a backup connection to the HP EFC Server and ensures continued director operation if the active CTP card fails. • SBAR assemblies The director contains two serial crossbar (SBAR) assemblies. The redundant serial SBAR assembly ensures uninterrupted transmission and receipt of Fibre Channel frames between ports if the active SBAR card fails. Introduction Director Features 9