NonStop Operations Guide for H-Series and J-Series RVUs

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6. Select Yes.
System Shutdown Using SCF
To power off the system using SCF, log on to an available TACL command interpreter as the super
ID (255,255) and issue the SCF power-off command:
> SCF CONTROL SUBSYS $ZZKRN, SHUTDOWN
Emergency Power-Off Procedure
If possible, HP recommends that the system be in a low-power state before you remove power to
the system. However, in emergency situations, you might need to quickly remove AC power from
a system. Sites equipped with an emergency power-off (EPO) switch can use it to remove AC power
from your entire system. For more information on the EPO system, see the Planning Guide for your
NonStop system.
For sites that are not equipped with an EPO switch, switch off the circuit breakers to the power
cords connected to the cabinets and peripherals. For more information, refer to Chapter 16
(page 170).
Troubleshooting and Recovery Operations
Refer to the appropriate section for recovery information:
• “Recovering From a System Load Failure ” (page 194)
• “Getting a Corrupt System Configuration File Analyzed” (page 195)
• “Recovering From a Reload Failure ” (page 195)
• “Exiting the OSM Low-Level Link” (page 196)
• “Opening Startup Event Stream and Startup TACL Windows” (page 196)
If any of these problems occur when you power on a system, see the appropriate section for
recovery information:
• “Fans Are Not Turning” (page 193)
• “System Does Not Appear to Be Powered On” (page 193)
• “Green LED Is Not Lit After POSTs Finish” (page 194)
• “Amber LED on a Component Remains Lit After the POST Finishes” (page 194)
• “Components Fail When Testing the Power ” (page 194)
Fans Are Not Turning
If the fans do not start turning a few seconds after you power on the system, check that the AC
power cords and component power cords are properly connected.
If the green LED lights are lit, but the fans are not turning, you must power off the system immediately.
See in “Powering Off a System” (page 192). Contact your service provider.
System Does Not Appear to Be Powered On
If AC power is being supplied to the system and the fans are turning but the system still does not
appear to be powered, the system might be running internal tests. Wait several minutes (at least
Troubleshooting and Recovery Operations 193