Controller and expansion modules 43
Controller and expansion modules
This section describes the IOMs used in Lenovo ThinkSystem DS Series storage enclosures. They are
mechanically and electrically compliant to the latest SBB v2.1 specification.
The isometric rear orientation in Figure 36 shows a frontal face plate view of a 4-port FC/iSCSI controller module
aligned for use in the top controller module slot located on the 2U enclosure rear panel.
Figure 36 Controller module – isometric rear orientation
NOTE: Given that the 5U84 is configured as an EBOD, it does not support controller modules. Rather, it
supports the expansion module used by DS EXP enclosures. See Figure 43 (page 52) and Figure 77 (page 115).
Each controller module maintains VPD (Vital Product Data) in EEPROM devices, and are interconnected by
SBB-defined I
2
C buses on the midplane. In this way, the SBB modules can discover the type and capabilities of the
partner SBB module(s), and vice versa, within the enclosure. An enclosure system alarm occurs when incompatible
configurations are detected.
12Gb/s controller module LEDs
The diagrams with tables that immediately follow provide descriptions for the different controller modules that can
be installed into the rear panel of a DS Series and DS EXP/D3284 controller enclosure. Showing controller
modules separately from the enclosure enables improved clarity in identifying the component items called out in
the diagrams and described in the companion tables within the figure/table ensembles. In each IOM diagram, the
controller module is oriented for insertion into the top IOM slot (A). When oriented for use in the bottom IOM slot
(B), the IOM labels appear upside down.
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