Users Guide

● 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.
Assigning Priority Levels To Servers Using CMC Web
Interface
To assign priority levels:
1. In the left pane, click Server Overview > Power > Priority.
The Server Priority page lists all the servers in the chassis.
2. From the Priority drop-down menu, select a priority level (1–9, where 1 is the highest priority) for one, multiple, or all
servers. The default value is 1. You can assign the same priority level to multiple servers.
3. Click Apply to save your changes.
Assigning Priority Levels To Servers Using RACADM
Open a serial/Telnet/SSH text console to CMC, log in, and type:
racadm config -g cfgServerInfo -o cfgServerPriority -i <slot number> <priority level>
where <slot number> (1–4) refers to the location of the server, and <priority level> is a value between 1–9.
Managing and Monitoring Power
165