NEC SIGMABLADE N8406-020 - Manual (Page 110)

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Sample cascade connection
„ Setting Principal switch only for the FC Switch Module in Blade Enclosure
(SIGMABLADE) must be done. For how to set Principal switch, see "Checking
/ Setting Principal Selection Mode" in "Appendix FC Switch Module Setting
Features".
„
Cascading two FC Switch Modules (Blade Enclosure)
1. One path configuration between the FC Switch Modules
„ 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 #1 Blade Enclosure #2
Blade Enclosure #1 Blade Enclosure #2