Figure 7. No Redundancy with three PSUs in the chassis
A PSU failure brings other PSUs out of Standby mode, as needed, to support the chassis power allocations. If you have
four PSUs, and require only three, then in the event that one fails, the fourth PSU is brought online. A chassis can have
all six PSUs online.
When you enable DPSE, the extra PSUs may be placed in Standby mode to increase efficiency and save power. For
more information, see
Default Redundancy Configuration
.
Dynamic Power Supply Engagement
Dynamic Power Supply Engagement (DPSE) mode is disabled by default. DPSE saves power by optimizing the power
efficiency of the PSU’s supplying power to the chassis. This also results in increased PSU life, and reduced heat
generation.
CMC monitors total enclosure power allocation, and moves the PSUs into Standby state, causing the total power
allocation of the chassis to be delivered through fewer PSUs. Since the online PSUs are more efficient when running at
higher utilization, this improves their efficiency while also improving longevity of the standby PSUs.
To operate remaining PSUs at their maximum efficiency:
•
No Redundancy mode with DPSE is highly power efficient, with optimal PSUs online. PSUs that are not needed
are placed in standby mode.
•
PSU Redundancy mode with DPSE also provides power efficiency. At least two supplies are online, with one
PSU required to power the configuration and one to provide redundancy in case of PSU failure. PSU
Redundancy mode offers protection against the failure of any one PSU, but offers no protection in the event of
an AC grid loss.
•
AC Redundancy mode with DPSE, where at least two of the supplies are active, one on each power grid,
provides a good balance between efficiency and maximum availability for a partially-loaded modular enclosure
configuration.
•
Disabling DPSE provides the lowest efficiency as all six supplies are active and share the load, resulting in lower
utilization of each power supply.
DPSE can be enabled for all three power supply redundancy configurations explained above — No Redundancy, Power
Supply Redundancy, and AC Redundancy.
•
In a No Redundancy configuration with DPSE, the M1000e can have up to five power supply units in Standby
state. In a six PSU configuration, some PSU units are placed in Standby and stay unutilized to improve power
efficiency. Removal or failure of an online PSU in this configuration cause a PSU in Standby state to become
Online; however, standby PSUs can take up to two seconds to become active, so some server modules may lose
power during the transition in the No Redundancy configuration.
184
Содержание Chassis Management Controller
Страница 1: ...Dell Chassis Management Controller Firmware Version 4 3 User s Guide ...
Страница 42: ...42 ...
Страница 56: ...56 ...
Страница 84: ...84 ...
Страница 98: ...98 ...
Страница 104: ...104 ...
Страница 130: ...130 ...
Страница 136: ...136 ...
Страница 200: ...200 ...
Страница 214: ...214 ...