HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays, Reference Manual

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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