86 Netra T2000 Server Administration Guide • September 2006
When the system watchdog is running, a system hang, or more specifically, the hang
of the clock interrupt handler causes an expiration.
The system watchdog mode is the default. If the application watchdog is not
initialized, then the system watchdog mode is used.
The application mode enables you to:
■ Configure the watchdog timer – Your applications running on the host can
configure and use the watchdog timer, enabling you to detect fatal problems from
applications and to recover automatically.
■ Program Alarm3 – This capability enables you to generate this alarm in case of
critical problems in your applications.
The setupsc command, an existing command for ALOM, can be used to configure
the recovery for the system watchdog only:
sc> setupsc
The system controller configuration should be as follows:
The recovery configuration for the application watchdog is set using input/output
control codes (IOCTLs) that are issued to the ntwdt driver.
Watchdog Timer Limitations
The limitations of the watchdog timer mode include:
■ In the case of the watchdog timer expiration detected by the system controller, the
recovery is attempted only once; there are no further attempts of recovery if the
first attempt fails to recover the domain.
■ If the application watchdog is enabled and you break into the OpenBoot PROM
by issuing the break command from the system controller’s sc> prompt, the
system controller automatically disables the watchdog timer.
SC POST diag Level [off]:
Host Watchdog [enabled]:
Rocker Switch [enabled]:
Secure Mode [off]:
PROC RTUs installed: 0
PROC Headroom quantity (0 to disable, 4 MAX) [0]:
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