Setting Up The Watchdog Timer - HP AlphaServer TS15 Owner's Manual

3.2.2

Setting Up the Watchdog Timer

An AlphaServer TS15 system running Tru64 UNIX contains a watchdog timer that,
when enabled, monitors the running system and takes action should the system become
hung. The watchdog timer is functional only after enabling it within both the RMC
command-line interface as well as within Tru64 UNIX.
At the RMC prompt, the commands enable/disable wdt are used to enable or disable the
RMC's portion of the watchdog timer functionality. The commands enable/disable reboot
are used to determine what action the RMC takes in the event that a watchdog timer timeout
occurs. These commands need to be executed only once for the state to persist. For
additional information on these commands, see Section 6.11.
From the operating system, the watchdog timer functionality is turned off by default, but is
controlled by the 'titan' system attribute called . This
hbrick_watchdog_timer_enable
attribute can be set for the current session with the sysconfig command, or longer term via
the file.
/etc/sysconfigtab
To turn it on dynamically via sysconfig, enter the following command:
sysconfig -r titan hbrick_watchdog_timer_enable=1
To turn it off dynamically, enter this command:
sysconfig -r titan hbrick_watchdog_timer_enable=0
To turn it on at the earliest opportunity after boot, add these lines to the
file. This is the preferred method to enable the watchdog timer in the
/etc/sysconfigtab
operating system for normal operation.
titan:
hbrick_watchdog_timer_enable=1
When Tru64 UNIX shuts down, the operating system portion of the watchdog timer is turned
off, so there is no watchdog timer timeout while in console mode.
Booting and Installing an Operating System 3-15