
Chapter 10. JS23 and JS43 power management using EnergyScale technology 401
The Power Module Redundancy option is used when only one AC source is
present. One AC source in this case means the electrical grid. For example, the
BCH has two line cord inputs. Each is capable of connecting to its own AC power
source. If the two line cords attach to the same power grid, it is considered a
single AC source. It is possible to have a data center wired so that each AC line
cord of the BCH could be plugged into a separate power grid or AC source. If an
outage occurs on one power module, this option allows some redundancy and
may keep the chassis and blades running. A second power module failure may
result in a domain outage.
The third option, Power Module Redundancy with Blade Throttling is basically the
same as the Power Module Redundancy option except in case of a failure of a
module, the blades can be throttled back to allow the chassis and blades to
continue to run. Once an outage has been restored, the blades will return to
running at the un-throttled power level.
Figure 10-4 Power Management Policies
Selecting the Power Domain link as referenced by number 2 in Figure 10-1 on
page 399 will allow the user to select different components of the chassis to
modify the power settings. This is where you can select the BladeServer
JS23/JS43 to modify the power policies.
AMM Power domain details view
The BladeCenter Power Domain Details view shows each module that is
serviced by the power domain. The chassis location (bay), status, module type,
power state, current power in use, allocated maximums and minimums in watts,
and CPU duty cycles are shown for each module. Modules that have specific
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