HP StorageWorks 4000s NAS 4000s and 9000s Administration Guide - Page 22
NAS Server as a Single Device, stand alone deployments
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System Overview NAS Server as a Single Device In the single NAS device configuration, a NAS server is attached to a SAN via a single or pair of fiber channel host bus adapters (HBAs) and one or more SAN switches. In Figure 1, the dual HBA approach is illustrated. Each HBA should be connected to a separate switch that has access to the same controller pairs. This connection method allows redundant paths to the same storage subsystem. Dual HBAs per NAS device is recommended but not required for stand alone deployments, since dual HBAs allow for path failure while still providing access to the data. SAN storage is not managed by the NAS server and requires coordination between the NAS administrator and the SAN administrator. LUN requests need to be made and assigned to the NAS server using selective storage presentation from the SAN controller pairs. Naming of the LUNs and the connections to the NAS server is important for tracking and identification purposes. At least one LUN is required by the NAS server for the device to be functional. HBA 1 SAN Switch HBA 2 SAN Switch Storage Area Network Data RAID set LUN 1 Figure 1: NAS server as a single device Data RAID set LUN 2 22 NAS 4000s and 9000s Administration Guide