Product Documentation

Performing Power Control Operations by using the LOM Port

Jan 31, 2011

Through the LOM port, you can remotely perform power control operations, such as graceful shutdown and restart, power cycling the appliance, and restarting the BMC microcontroller. A cold restart takes longer than a warm restart. In a cold restart, you switch off power to the appliance and then switch it back on.

To perform power control operations by using the GUI

  1. In the Menu bar, click Remote Control.
  2. Under Options, click Power Control, and then select one of the following options:
    • Reset System—Gracefully restart the appliance. All operations on the appliance are stopped, no new connections to the client or server are accepted, and all existing connections are closed before the appliance restarts. This is similar to a warm restart, such as by entering the reboot command. The BMC does not reboot itself during this operation.
    • Power Off System – Immediate—Disconnect power to the appliance immediately, without gracefully shutting down the appliance. The BMC continues to operate normally in this mode to allow the user to remotely power on the appliance. This is the same as pushing the power button until the unit powers off.
    • Power Off System – Orderly Shutdown—Gracefully shut down the appliance, and then disconnect power to the appliance. Has the same effect as pressing the power button on the back panel of the appliance for less than four seconds. All operations on the appliance are stopped, no new connections to the client or server are accepted, and all existing connections are closed before the appliance shuts down. The BMC continues to operate normally in this mode to allow the user to remotely power on the appliance. This is the same as entering the shutdown command in the appliance shell.
    • Power On System—Turn on the appliance. The BMC does not reboot itself during this operation. This is the same as pushing the power button.
    • Power Cycle System—Turn off the appliance, and then turn it back on. The BMC does not reboot itself during this operation. This is the same as pushing the power button until the unit powers off, and then pushing the power button to power on the unit.
  3. Click Perform Action.

Performing a power cycle of the BMC

A warm restart, cold restart, or a power cycle of the appliance, using the power button, does not include power cycling the BMC. The BMC runs on standby power directly from the power supply. Therefore, the BMC is not affected by any state of the power button on the appliance. The only way to power cycle the BMC is to remove all power cords from the appliance for 60 seconds.

Performing power control operations on the BMC by using the appliance shell

When performing either a warm or cold restart of the BMC microcontroller, you cannot communicate with the LOM port. Both actions restart the BMC but not the main CPU. To perform a warm restart of LOM from the appliance, type:

ipmitool mc reset warm

To perform a warm restart remotely from another computer on the network, type:

ipmitool –U <bmc_gui_username> –P <bmc_gui_password> –H <bmc IP address> mc reset warm

To perform a cold restart of the LOM from the appliance, type:

ipmitool mc reset cold

To perform a warm restart remotely from another computer on the network, type:

ipmitool –U <bmc_gui_username> –P <bmc_gui_password> –H <bmc IP address> mc reset cold

Performing a Core Dump

If the appliance fails or becomes unresponsive, you can remotely perform a core dump. This procedure has the same effect as pressing the NMI button on the back panel of the appliance.

To perform a core dump by using the GUI

  1. In the Menu bar, click Remote Control.
  2. Under Options, click NMI, and then click Initiate NMI.

To perform a core dump remotely from another computer on the network by using the shell

At the shell prompt, type:

ipmitool -U <bmc_gui_username> -P <bmc_gui_password> -H <bmc IP address> chassis power diag