IBM H80 User Manual download pdf (Page 88)

Operating System Surveillance

Operating system surveillance provides the service processor with a means to detect

hang conditions, as well as hardware or software failures, while the operating system

is running. It also provides the operating system with a means to detect a service

processor failure caused by the lack of a return heartbeat.

Operating system surveillance is not enabled by default, allowing you to run

operating systems that do not support this service processor option.

You can also use Service Processor Menus and Service Processor Service Aids to

enable or disable operating system surveillance.

For operating system surveillance to work correctly, you must set three parameters:

 Surveillance enable/disable

 Surveillance interval

The maximum time the service processor should wait for a heartbeat from the

operating system before timeout.

 Surveillance delay

The length of time to wait from the time the operating system is started to when

the first heartbeat is expected.

Surveillance does not take effect until the next time the operating system is started

after the parameters have been set.

If desired, you can initiate surveillance mode immediately from Service Aids. In

addition to the three options above, a fourth option allows you to select immediate

surveillance, and rebooting of the system is not necessarily required.

If operating system surveillance is enabled (and system firmware has passed control

to the operating system), and the service processor does not detect any heartbeats

from the operating system, the service processor assumes the system is hung and

takes action according to the reboot/restart policy settings. See “Service Processor

Reboot/Restart Recovery” on page 64.

If surveillance is selected from the service processor menus which are only available

at bootup, then surveillance is enabled by default as soon as the system boots.

From Service Aids, the selection is optional.

72 RS/6000 Enterprise Server Model H80 Series User's Guide

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IBM H80 User Manual Page 88