Dell PowerEdge VRTX Chassis Management Controller Version 1.0 for Dell PowerEd - Page 149

Server Slot Power Priority Settings, Assigning Priority Levels To Servers

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priority servers may get less power than priority-one servers based on System Input Max Power Capacity, and the userconfigured setting of System Input Power Cap. Configuration changes, such as an additional server, shared HDDs, or PCIe cards in the chassis, may require the System Input Power Cap to be increased. Power needs in a modular enclosure also increase when thermal conditions change and the fans are required to run at higher speed, which causes them to consume additional power. Insertion of I/O module and storage adapters, PCIe cards, physical disk, main board; number, type, and configuration of PSUs also increase the power needs of the modular enclosure. A fairly small amount of power is consumed by servers even when they are powered down to keep the management controller powered up. Additional servers can be powered up in the modular enclosure only if sufficient power is available. The System Input Power Cap can be increased any time up to a maximum value of 5000 Watt to allow the power up of additional servers. Changes in the modular enclosure that reduce the power allocation are: • Server turned off • I/O module turned off • Storage adapters, PCIe cards, physical disk drive, and main board turned off • Transition of the chassis to a turned-off state You can reconfigure the System Input Power Cap when the chassis is either turned on or turned off. Server Slot Power Priority Settings CMC allows you to set a power priority for each of the four server slots in an enclosure. The priority settings are 1 (highest) through 9 (lowest). These settings are assigned to slots in the chassis, and the priority of the slots is inherited by any server inserted in that slot. CMC uses slot priority to preferentially budget power to the highest priority servers in the enclosure. According to the default server slot priority setting, power is equally apportioned to all slots. Changing the slot priorities allows administrators to prioritize the servers that are given preference for power allocations. If the more critical server modules are left at their default slot priority of 1, and the less critical server modules are changed to lower priority value of 2 or higher, the priority 1 server modules is powered on first. These higher priority servers get their maximum power allocation, while lower priority servers may be not be allocated enough power to run at their maximum performance or they may not even power on at all, depending on how low the system input power cap is set and the server power requirements. If an administrator manually powers on the low priority server modules before the higher priority ones, then the low priority server modules are the first modules to have their power allocation lowered down to the minimum value, in order to accommodate the higher priority servers. Therefore, after the available power for allocation is exhausted, CMC reclaims power from lower or equal priority servers until they are at their minimum power level. NOTE: I/O module, fans, and mainboard, physical disk drives, storage adapters are given the highest priority. CMC reclaims power only from the lower-priority devices to meet the power needs of a higher-priority device or server. Assigning Priority Levels To Servers When additional power is required, server priority levels determine which servers the CMC draws power from. NOTE: The priority you assign to a server is linked to a server's slot and not to the server itself. If you move the server to a new slot, you must re-configure the priority for the new slot location. NOTE: To perform power management actions, you must have the Chassis Configuration Administrator privilege. 149

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priority servers may get less power than priority-one servers based on
System Input Max Power Capacity
, and the user-
configured setting of
System Input Power Cap
.
Configuration changes, such as an additional server, shared HDDs, or PCIe cards in the chassis, may require the
System
Input Power Cap
to be increased. Power needs in a modular enclosure also increase when thermal conditions change
and the fans are required to run at higher speed, which causes them to consume additional power. Insertion of I/O
module and storage adapters, PCIe cards, physical disk, main board; number, type, and configuration of PSUs also
increase the power needs of the modular enclosure. A fairly small amount of power is consumed by servers even when
they are powered down to keep the management controller powered up.
Additional servers can be powered up in the modular enclosure only if sufficient power is available. The
System Input
Power Cap
can be increased any time up to a maximum value of 5000 Watt to allow the power up of additional servers.
Changes in the modular enclosure that reduce the power allocation are:
•
Server turned off
•
I/O module turned off
•
Storage adapters, PCIe cards, physical disk drive, and main board turned off
•
Transition of the chassis to a turned-off state
You can reconfigure the
System Input Power Cap
when the chassis is either turned on or turned off.
Server Slot Power Priority Settings
CMC allows you to set a power priority for each of the four server slots in an enclosure. The priority settings are 1
(highest) through 9 (lowest). These settings are assigned to slots in the chassis, and the priority of the slots is inherited
by any server inserted in that slot. CMC uses slot priority to preferentially budget power to the highest priority servers in
the enclosure.
According to the default server slot priority setting, power is equally apportioned to all slots. Changing the slot priorities
allows administrators to prioritize the servers that are given preference for power allocations. If the more critical server
modules are left at their default slot priority of 1, and the less critical server modules are changed to lower priority value
of 2 or higher, the priority 1 server modules is powered on first. These higher priority servers get their maximum power
allocation, while lower priority servers may be not be allocated enough power to run at their maximum performance or
they may not even power on at all, depending on how low the system input power cap is set and the server power
requirements.
If an administrator manually powers on the low priority server modules before the higher priority ones, then the low
priority server modules are the first modules to have their power allocation lowered down to the minimum value, in order
to accommodate the higher priority servers. Therefore, after the available power for allocation is exhausted, CMC
reclaims power from lower or equal priority servers until they are at their minimum power level.
NOTE:
I/O module, fans, and mainboard, physical disk drives, storage adapters are given the highest priority. CMC
reclaims power only from the lower-priority devices to meet the power needs of a higher-priority device or server.
Assigning Priority Levels To Servers
When additional power is required, server priority levels determine which servers the CMC draws power from.
NOTE:
The priority you assign to a server is linked to a server's slot and not to the server itself. If you move the
server to a new slot, you must re-configure the priority for the new slot location.
NOTE:
To perform power management actions, you must have the
Chassis Configuration Administrator
privilege.
149