HGST Ultrastar Data102 User Manual page 43

3. Component Overviews
3.2 IOM Description
User Guide
Figure 14: Overview Image
Each IOM provides system data connectivity through 6 Mini-SAS HD ports capable of four 12Gbps
SAS connections each. The IOMs are N+1 redundant, hot-swappable components. The IOMs
are installed into the central bay from the top of the Chassis and connect to the drive board. The
baseboard completes the connection to the Mini-SAS HD ports that extend out of the rear of the
enclosure.
The IOM contains a primary and two SAS expander chips, and an out-of-band management (OOBM)
chip that connects to the management port on the rear of the enclosure.
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