Specifications

58 IBM Flex System p260 and p460 Planning and Implementation Guide
The redundancy options are configured from the Chassis Management Module
and can be changed nondisruptively. The five policies are shown in Table 3-2.
Table 3-2 Chassis power management policies
In addition to the redundancy settings, a power limiting and capping policy can
be enabled by the Chassis Management Module to limit the total amount of
power that a chassis requires.
Tip: N+1 in this context means a single backup device for N number of
devices. Any component can replace any other component, but only one time.
N+N means that there are N backup devices for N devices, where N number
of devices can fail and each has a backup.
Power management policy Function
Basic Allows chassis to fully use power supplies (no N+N or
N+1 redundancy).
Redundancy Single power supply redundancy, and no blade
throttling (N+1 setting).
Redundancy with throttling Single power supply redundancy. Blades can be
throttled to stay within the available power. This
setting provides higher power availability over simple
redundancy (N+1 setting).
AC power source redundancy Maximum power available, limited to one-half of the
installed number of power supplies (N+N setting).
AC power source redundancy
with throttling
Maximum power available, limited to one-half of the
installed number of power supplies. Blades can be
throttled to stay within available power. This setting
provides higher power availability compared with
simple AC power source redundancy (N+N setting).
Throttling: Blade throttling in the simplest terms is an IBM EnergyScale™
feature of POWER architecture that allows the processor frequency to be
varied to reduce power requirements.