HP NonStop NS manual When to Use This Section, Powering On a System

Starting and Stopping the System When to Use This Section

Recovering From a Reload Failure on page 15-21

Exiting the OSM Low-Level Link on page 15-22

Opening Startup Event Stream and Startup TACL Windows on page 15-22

Related Reading on page 15-24

When to Use This Section

Normally, you leave a system running. However, some procedures or recovery actions require you to start the system (perform a system load) or stop or power off the system.

•Stop and then power off a system before:

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°

An extended planned power outage for your building or computer room.

Performing some major maintenance or repair operations as noted in the documentation.

•Stop or restart a system (without powering off) when:

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°

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Installing an updated RVU or some software product revisions (SPRs).

Performing some recovery operations as noted in the documentation.

Restarting the system after the entire system has been shut down with the operating system images and files on disk still intact.

Powering On a System

Powering on a system delivers AC power to the system cabinets. Fans on the processor switches, processor Blade Elements, IOAM or VIO enclosures, and disk drive enclosures start turning, and air begins to circulate through the components. After the fans start to operate, most other system components begin to power on.

Status light-emitting diodes (LEDs) on the system components light during a series of power-on self-tests (POSTs). Any of the LEDs can become lit briefly during the POSTs. After all the POSTs finish successfully, which might take up to 10 minutes, only the green power-on LED on each component in the system enclosures should remain lit. For more information about the LEDs, refer to Using the Status LEDs to Monitor the System on page 3-20.

The method you use to power on the system depends on whether the system is in a low power state or completely powered off:

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Powering On the System From a Low Power State on page 15-3

Powering On the System From a No Power State on page 15-3

HP Integrity NonStop NS-Series Operations Guide—529869-005

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