NonStop NS16000 Series Planning Guide (H06.11+)

IOAM Enclosure
An IOAM enclosure is 11U high, Each enclosure contains:
• Four power supplies with dual AC input
• Four fans provide front-to-rear cooling
• Two ServerNet switch boards (for the X fabric and Y fabric) for ServerNet routing to the
ServerNet adapters in the IOAM enclosure. These boards also have maintenance entity (ME)
logic and firmware, maintenance connection (Ethernet), and an LCD for:
◦ IP address
◦ Group-module-slot
◦ Cabinet name and offset
◦ ME firmware revision
◦ Field programmable gate array (FPGA) firmware revision
• Up to ten dual-ported (X and Y ServerNet fabrics) ServerNet Adapters
FCSAs to Fibre Channel disk modules, tape devices, or Enterprise Storage System (ESS)◦
◦ G4SAs for 10/100/1000 and 10/100 Ethernet connectivity to local and wide area
networks
CAUTION: To maintain proper cooling air flow, blank panels must be installed in all
slots that do not contain ServerNet adapters.
The four power supplies do not support the entire IOAM enclosure. Instead, two power supplies
support each of the enclosure’s two modules. For each module to operate, at least one power
supply in each module must be operational. For fault tolerance, you must connect the power supplies
in each module to separate power distribution units (PDUs). For example, the power supplies in
(2, 15) and (2, 18) cannot both be plugged into the left PDU.
The dual IOAM modules in each IOAM enclosure promote fault-tolerant configuration and servicing:
• Redundant hardware provides fault tolerance if it is divided between modules.
• Fault-tolerant paths must be configured through different modules.
This illustration shows the front and rear of the IOAM enclosure and details:
126 Modular System Hardware