User guide

Galaxy 55 User Guide
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1.3.3 Loop Resiliency Circuit Input/Output Module (FC)
The plug-in Input/Output (I/O) modules have been designed for integration into a Galaxy 55 storage subsystem,
utilizing FCAL interfacing with the host computer system.
The FC-AL Backplane incorporates two independent loops formed by Port Bypass Circuits within the Loop
Resiliency Circuit (LRC) I/O modules. There are two variants of LRC I/O modules that may be fitted, the SS-1x12-
FC-IO and the SS-2x6-FC-DC-IO. Only modules of the same type may be fitted in a single enclosure. Please refer
to section 2.6 for more information. An example of a plug-in LRC I/O module is shown in Figure 1–9.
The Galaxy 55 storage subsystem includes an enclosure with rear facing bays which house two I/O modules in Bays
3/2 and 3/3. (Figure 1–10).
The enclosure may obviously be configured with either 1 or 2 modules. If only 1 module is fitted this Must be
installed in middle Bay 3/2 as the Device ID thumbwheel switches only operate in this bay.
Figure 1–8 ESI/Ops Panel Drive Start Switch
Figure 1–9 FC-AL LRC I/O Module