Loop Resiliency Circuit (Lrc) Modules; Figure 11-7 D-Brick2 Loop Resiliency Circuit (Lrc) Module - Silicon Graphics Origin 3900 User Manual

11: D-brick2

Loop Resiliency Circuit (LRC) Modules

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The D-brick2 uses a Fibre Channel arbitrated loop (FC-AL) to interface with your Origin
3900 server. The FC-AL backplane incorporates two independent loops formed by port
bypass circuits within the LRC modules.
The enclosure services processor housed on the LRC modules manages the enclosure and
provides an interface to devices on the backplane, a PSU/cooling module, and an ops
panel to monitor internal functions. These processors operate in a master/slave
configuration to allow failover. See the SGI Total Performance 9100 (2Gb TP9100) Storage
System User's Guide (P/N 007-4522-00x) for details.
Note: The LRC module can address up to 96 disk drives; a maximum of six enclosures
can be cabled together.
The enclosure may be configured with either one or two LRC I/O modules (see
Figure 11-7). If only one module is installed, an I/O blank module must be installed in
the unused bay.
ESI fault LED
RS-232 port
FC-AL signal present LED
FC-AL signal present LED
FC-AL signal present LED
FC-AL signal present LED
Figure 11-7 D-brick2 Loop Resiliency Circuit (LRC) Module
007-4653-001