50 IBM NeXtScale System Planning and Implementation Guide
The USB key saves the following information:
Event log
Enclosure configuration data:
– PSU redundancy setting
– Oversubscription mode setting
– Chassis/node-level power capping value and settings
– Power restore policy
– Acoustic mode setting
Midplane vital product data (VPD)
If the FPC fails and must be replaced, users can restore the configuration data to
the new FPC by transferring the USB from the old unit to the new unit.
3.7.3 Overview of functions
The FPC performs the following functions:
Controls the power and power management features of the chassis, compute
nodes, and power supplies. The FPC prevents a compute node from
powering on if there is insufficient power.
Controls the cooling of the chassis. The FPC ramps up fan speeds if
conditions require more cooling (or slow down the fans to conserve energy if
higher fan speeds are not required).
Provides the following user interfaces:
– Web interface
– IPMI command line (for external management tools, such as, xCAT)
Allows you to select one of the following power supply redundancy policies:
– N+1, where one power supply is redundant and allows for a single power
supply to fail without any loss of function.
– N+N, where half the power supplies are redundant backups of the other
half. This is useful if you have two power utility sources and want the
chassis to survive the failure of one of the utility sources.
– Non-redundant, which maximizes the power that is available to the
compute nodes at the expense of power supply redundancy.
– Oversubscription, which can be enabled with N+1 and N+N policies.
Support the updating of FPC firmware.
Monitors and reports fan, power, and chassis status and other failures with
event log and corresponding LEDs.
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