IBM Enterprise Server S80, User Manual

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Surveillance does not take effect until the next time the operating system is started after
setting the parameters.
If desired, surveillance mode can be initiated immediately from service aids. In addition
to the three options above, a fourth option is available to allow you to select immediate
surveillance; 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 85.
If surveillance is selected from the service processor menus which are only available at
bootup, then surveillance is by default enabled as soon as the system boots. From
service aids, the selection is optional.
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S80 and S85 User’s Guide