HP LH4r HP NetServer FCArray Assistant - Installation and User Guide - Page 86
card in the HP Rack Storage/12FC chassis. When configuring the HP Rack
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Chapter 4 Configuration The Rack Storage/12FC supports four host ports and, depending on the configuration of the Rack Storage/12FC, there may be from two to four host ports. Each configured logical drive consumes a particular bus-target ID-LUN on the host system. Multiple sets of disk drives are connected to the FCArray Controller via its drive channels. There are four drive channels on the Rack Storage/12FC. NOTE This section presents only a brief introduction to RAID Controller operation. For additional details, consult the HP Rack Storage/12FC Installation Guide. Presently, Hewlett-Packard's FCArray Assistant only supports two configuration types: • Simplex mode - Simplex configurations use a single FCArray Controller card in the HP Rack Storage/12FC chassis. When configuring the HP Rack Storage/12FC for a Simplex configuration, only one of the HSSDC Fibre Channel ports on the FCArray Controller card is required, Port 0 or Port 1. This allows the Rack Storage/12FC to operate in a single host or cluster configuration without any additional changes. See Figures 4-43 and 4-44. • Dual Active (duplex) mode - Dual Active (or Active/Active) configurations use two FCArray Controller cards in the same HP Rack Storage/12FC chassis. In Dual Active mode, two identical FCArray Controller cards are connected to the same hosts via the host ports, to the same drives via the drive channels and to each other via a special hardware link for heartbeat sensing. This forms a redundant controller system. The two controllers work together handling data traffic and mirror the write data in the corresponding host's cache memory. If one of the controllers fails or otherwise becomes non-operational, the surviving controller takes over its responsibilities with no loss of data. When configuring the HP Rack Storage/12FC for a Dual Active configuration, all four HSSDC Fibre Channel ports must be connected to a FC Hub. See Figures 4-43 and 4-44. Initially Controller 0/Port 0 and Controller 1/Port 1 are active. If a controller failover condition occurs, then Controller 0/Port 1 and Controller 1/Port 0 go active and remain active only during the failover condition. When the condition is cleared, Controller 0/Port 1 and Controller 1/Port 0 go inactive again. When creating LUN mappings for Failover configurations, only specify LUN mappings for LUNs on the initially active controllers, Controller 0/Port 0 and/or 80