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4.987 bytes |
Service Hints & Tips |
Document ID: DDSE-3QKLR5 |
PC Server 720 - Starting or stopping the system
Applicable to: World-Wide
Starting or Stopping the System:
Starting or Powering-On the System:
To power-on the computer under normal conditions, you must have the power enable button active and push the start/stop button.
When the computer is powered-on, it may be shut down by pressing the start/stop button.
This causes one of the following scenarios to occur in the service processor (SP):- A non-maskable interrupt (NMI) is generated and sent to the host processor and a count-down timer to power-off the computer is started. When the timer reaches zero (0) the system is powered-off. This option requires a NMI device driver to flush cache and close the file system before the time out.
An SP interrupt is generated and sent to the host processor and a count-down timer to power-off the computer is started. When the timer reaches zero, the computer is powered-off. This option requires an SP device driver to interface to the operating system to close the file system before the timeout.
No interrupt is generated and the computer is powered-off after the count-down timer times out. The default value for the count down timer is zero or power-off immediately.
A message is displayed requesting that the enter button be pressed to power-off the computer.
Note:
When changing the Real-Time Clock module or resetting the CMOS RAM, you must press and hold the start/stop button in until a message is displayed saying the real-time clock (RTC) has been updated or reset.
Stopping or Powering-Off the System:
When the Start/Stop button is pressed, the service processor (SP) sends an interrupt causing the count-down timer to start. When the timer reaches zero (0), the computer is powered-off. The default value for this timer is zero (0) seconds. The SP also interrupts the host system through the SP or NMI interrupts if these features are enabled. The SP will display a message on the LCD indicating that the computer will power-off in XX seconds. If enabled, this feature can be canceled by pressing the Enter button.
Power-On/Off Scenarios:
The computer is designed with a soft power-on and -off function. This function requires the following changes in how the computer is powered on and off. The SMART function looks at the hardware at power-on and takes control of the power-off function.
The first change is a Power Enable button. This button is a logical emergency power off (EPO) switch that does not remove all power from the computer; it continues power to the bus as long as AC is connected, but it will power-off all other components of the computer immediately and prevent it from being powered-on until the Power Enable button is pressed again.
The second change is that after any AC power interruption to the computer, the computer will power-on to determine what state it should be in (on or off). If the computer was powered-off before the AC power interruption, it will power-off when power is restored. If the computer was powered-on before the AC power interruption, it will power-on when power is restored.
Note:
If the Power Enable button is not on and the AC is interrupted, the system will not power-on and check to see if it should be on until the next time the Power Enable button is pressed.
The white power-on button is used to power-on or -off the computer. You must press and hold this button for about two seconds on some models.
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Hint Category |
Power | |
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Date Created |
20-08-96 | |
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Last Updated |
30-09-98 | |
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Revision Date |
29-09-99 | |
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Brand |
IBM PC Server | |
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Product Family |
PC Server 720 | |
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Machine Type |
8642 | |
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