HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 55
Level 3: single resilient fabric with multiple device paths
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25099a Figure 13 Level 2: single resilient fabric . Level 3: single resilient fabric with multiple device paths Level 3 is the same as level 2 but also provides multiple server and storage system paths to the fabric to increase availability (Figure 14). If a switch, server HBA, or storage system path failure occurs, data is automatically rerouted through an alternate path and there is no interruption in server I/O activity. To take full advantage of this level, HP recommends that you connect each server HBA and each storage system path to a different switch to increase availability and reduce the potential for an SPOF. This level provides both fabric resiliency and device path redundancy. NOTE: Certain operating systems may require the use of fabric zoning to define a minimum of two zoned paths for each server configured with multiple paths in a single fabric. 25100a Figure 14 Level 3: single resilient fabric with multiple device paths . SAN Design Reference Guide 55