Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/O2000 for Ora - Page 71

Cluster Architecture 2-47 I/O Path Configuration Guidelines for Redundant Fibre Channel Arbitrated Loops You can use either of two I/O path configurations for every redundant FC-AL in your PDC/O2000 cluster: I Active/standby configuration I Active/active configuration In every redundant FC-AL, at least two Fibre Host Adapters must be installed in each node (one Fibre Host Adapter for each Storage Hub or FC-AL Switch in that redundant FC-AL). In the active/standby configuration, only one of the two Fibre Host Adapters in each node is active at any one time; the other Fibre Host Adapter is in the standby state. The active Fibre Host Adapter is connected to the first Storage Hub or FC-AL Switch, which is connected to the active array controller in each RA4000/RA4100 Array. The standby Fibre Host Adapter is connected to the second Storage Hub or FC-AL Switch, which is connected to the standby array controller in each RA4000/RA4100 Array. The standby Fibre Host Adapter remains in the standby state unless a failover from the active I/O path occurs. In the active/standby configuration, the failure of any component along an active I/O path (Fibre Host Adapter, Storage Hub or FC-AL Switch, active array controller, or Fibre Channel cable) causes Secure Path to implement a complete failover to the components on the standby I/O path. In the active/active configuration, both Fibre Host Adapters in each node are simultaneously active. Both are active because each Fibre Host Adapter is connected to a Storage Hub or FC-AL Switch that, in turn, is connected to an active array controller in each RA4000/RA4100 Array. Because each Fibre Host Adapter and Storage Hub or FC-AL Switch must connect to at least one active array controller, at least two RA4000/RA4100 Arrays must be present in an active/active configuration.