User's Manual

Power Management 299
Using the Web Interface
Verify that the 110 V circuit is rated for the current expected, and then
perform the following steps:
1
Click Chassis Overview in the system tree.
2 Click Power  Configuration .
3 Select Allow 110 VAC Operation and click Apply .
Using RACADM
Verify that your 110 V circuit is rated for the expected current, and then
perform the following steps:
1
Open a serial/Telnet/SSH text console to the CMC and log in.
2 Enable 110 VAC PSUs:
racadm config -g cfgChassisPower -o
cfgChassisAllow110VACOperation 1
PSU Failure With Degraded or No Redundancy Policy
The CMC decreases power to servers when an insufficient power event
occurs, such as a PSU failure. After decreasing power on servers, the CMC
re-evaluates the power needs of the chassis. If power requirements are still not
met, CMC powers off lower priority servers.
Power for higher priority servers is restored incrementally while power needs
remain within the power budget.
NOTE: To set the redundancy policy, see "Configuring Power Budget and
Redundancy" on page 315.
New Server Engagement Policy
When a new server is powered on, the CMC may need to decrease power to
lower priority servers to allow more power for the new server if adding the new
server exceeds the power available for the chassis. This could happen if the
administrator has configured a power limit for the chassis that is below what
would be required for full power allocation to the servers, or if insufficient
power is available for the worst-case power need of all servers in the chassis.
If enough power cannot be freed by reducing the allocated power of the lower
priority servers, the new server may not be allowed to power up.