When the host system begins to boot up the Solaris operating system, the ntwdt-boottimeout value specifies the amount of time, in seconds, that the watchdog system must be programmed.
Note that if the application watchdog is enabled, the user program must program the watchdog system using the LOMIOCDOGTIME or LOMIOCDOGCTL ioctls; otherwise, the kernel will do it automatically.
If the watchdog is not programmed, then ALOM will take the recovery action.