HP ProLiant 4500 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator Gui - Page 21
Compaq StorageWorks Fibre Channel Storage Hubs, Compaq StorageWorks RA4000 Controller
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Architecture of the Compaq ProLiant Clusters HA/F100 and HA/F200 1-9 Compaq StorageWorks Fibre Channel Storage Hubs The servers in a Compaq ProLiant Cluster HA/F100 and HA/F200 are connected to one or more Compaq StorageWorks Raid Array 4000 shared external storage systems using industry-standard Fibre Channel Arbitrated Loop (FC-AL) technology. The components used to implement the Fibre Channel Arbitrated Loop include shortwave (multi-mode) fiber optic cables, Gigabit Interface Converters-Shortwave (GBIC-SW) and Fibre Channel storage hubs. The Compaq StorageWorks Fibre Channel Storage Hub is a critical component of the FC-AL configuration and allows up to five RA4000s to be connected to the cluster servers in a "star" topology. For the HA/F100, a single hub is used. For the HA/F200, two redundant hubs are used. Either the 7-port or 12-port hub may be used in both types of clusters. For the HA/F200 cluster, 7-port and 12-port hubs may be combined, if desired. If the maximum number of supported RA4000s (currently five) are connected to either type of cluster using a 12-port hub, there will be unused ports. Compaq does not currently support using these ports to connect additional RA4000s. Other FC-AL capable devices such as tape backup systems should not be connected to these unused ports under any circumstances. Compaq StorageWorks RA4000 Controller The Compaq StorageWorks RA4000 Controller is fully RAID capable and manages all of the drives in the RA4000 storage array. Each RA4000 is shipped with one controller installed. In an HA/F100 cluster, each array controller is connected to both servers through a single Fibre Channel storage hub. In an HA/F200 cluster, the addition of a second Compaq StorageWorks RA4000 Redundant Controller is required to provide redundancy. These redundant controllers are connected to each server through two separate, and redundant, Fibre Channel storage hubs. This dual-connection configuration implements a vital aspect of the enhanced high availability features of the HA/F200 cluster.