NEC SIGMABLADE N8406-020 - Manual (Page 111)

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Cascading three 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).
2. Two paths configuration between the FC Switch Modules
„ By making cascade connection between FC Switch Modules to two paths,
even if a failure occurs on one cascade path, no influence to I/O operation
occur because I/O operation is succeeded by redundant path and no Fabric
reconstruction occurs.
Blade Enclosure #2 Blade Enclosure #3
Blade Enclosure #1
Blade Enclosure #2 Blade Enclosure #3
Blade Enclosure #1