Compaq AlphaServer DS20 Service Manual download pdf (Page 136)

A-4 AlphaServer DS20 Service Manual

A.3

Halt Assertion

A halt assertion allows you to disable automatic boots of the operating system so

that you can perform tasks from the SRM console.

Under certain conditions, you might want to force a “halt assertion.” A halt assertion

differs from a simple halt in that the SRM console “remembers” the halt. The next

time you power up, the system ignores the SRM power-up script (nvram) and ignores

any environment variables that you have set to cause an automatic boot of the

operating system. The SRM console displays this message:

Halt assertion detected

NVRAM power-up script not executed

AUTO_ACTION=BOOT/RESTART and OS_TYPE=NT ignored, if applicable

Halt assertion is useful for disabling automatic boots of the operating system when

you want to perform tasks from the SRM console. It is also useful for disabling the

SRM power-up script if you have accidentally inserted a command in the script that

will cause a system problem. These conditions are described in the sections

“Disabling Autoboot” and “Disabling the SRM Power-Up Script.”

You can force a halt assertion using the Halt button, the RCM halt command, or the

RCM haltin command. Observe the following guidelines for forcing a halt assertion.

Halt Assertion with Halt Button or RCM Halt Command

Press the Halt button on the local system (or enter the RCM halt command from a

remote system) while the system is powering up or the SRM console is running. The

system halts at the SRM console, and the halt status is saved. The next time the

system powers up, the saved halt status is checked.

NOTE: Wait 5 seconds after the system begins powering up before pressing the Halt

button or remotely entering the RCM halt command.

Halt Assertion with RCM Haltin Command

Enter the RCM haltin command at any time except during power-up. For example,

enter haltin during an operating system session or when the AlphaBIOS console is

running.

If you enter the RCM haltin command during a Compaq TRU64 UNIX or OpenVMS

session, the system halts back to the SRM console, and the halt status is saved. The

next time the system powers up, the saved halt status is checked.

If you enter the RCM haltin command when Windows NT or AlphaBIOS is running,

the interrupt is ignored. However, you can enter the RCM haltin command followed

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Compaq AlphaServer DS20 Service Manual Page 136