NEC SIGMABLADE N8406-020 - Manual (Page 112)

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3. Alternate path between the FC Switch Modules
„ By making cascade connection among all three FC Switch Modules, even if a
failure occurs on one cascade path, no influence to I/O operation occur
because communication between FC Switch Modules can be succeeded by
the alternate path and no Fabric reconstruction occur.
„
Cascading four FC Switch Modules (Blade Enclosure)
1. Configuration with minimum number of cascading paths
„ If a failure occurs on the cascading path between the FC Switch Modules, a
Fabric reconstruction occurs. Influence to I/O operations may occur not only
between the cascading FC Switch Modules but within each FC Switch Module
(each Blade Enclosure).
Blade Enclosure #2 Blade Enclosure #3
Blade Enclosure #1
Blade Enclosure #2 Blade Enclosure #3 Blade Enclosure #4
Blade Enclosure #1