Specifications

Chapter 5. Planning 143
Power redundancy settings
There are five power management redundancy settings available for selection:
򐂰 AC Power Source Redundancy
Intended for dual AC power sources into the chassis. Maximum input power is
limited to the capacity of two power modules. This approach is the most
conservative one, and is best used when all four power modules are installed.
When the chassis is correctly wired with dual AC power sources, one AC
power source can fail without affecting compute node server operation. Some
compute nodes may not be allowed to power on if doing so would exceed the
policy power limit.
򐂰 AC Power Source Redundancy with Compute Node Throttling Allowed
Similar to the AC Power Source Redundancy. This policy allows higher input
power, and capable compute nodes may be allowed to throttle down if one
AC power source fails.
򐂰 Power Module Redundancy
Intended for a single AC power source in the chassis where each power
module is on its own dedicated circuit. Maximum input power is limited to one
less than the number of power modules when more than one power module is
present. One power module can fail without affecting compute node
operation. Multiple power module failures can cause the chassis to power off.
Some compute nodes may not be allowed to power on if doing so would
exceed the policy power limit.
򐂰 Power Module Redundancy with Compute Nodes Throttling Allowed
Similar to Power Module Redundancy. This policy allows higher input power;
however, capable compute nodes may be allowed to throttle down if one
power module fails.
򐂰 Basic Power Management
Maximum input power is higher than other policies and is limited only by the
nameplate power of all the power modules combined. This approach is the
least conservative one, because it does not provide any protection for an AC
power source or power module failure. If any single power supply fails, the
compute node or chassis operation might be affected.