Hardware Watchdog

The Ultra-Enterprise provides the ability to enable a hardware timer which will hard-reset the system if it times out. To enable the use of this feature, watchdog_enable must be set to '1' via /etc/system.

History Log Option of prtdiag(1M)

The prtdiag(1M) command is used to display system configuration and diagnostic information. The -l option of prtdiag(1M) logs its output to syslogd(1M) only if failures or errors exist in the system.

Resetting and Power- Cycling the System from a Remote Console

You can reset the system or cycle power from the remote console under these conditions:

• The console must be connected to port A on the clock board.
• The key switch must be in either the On or Diagnostic setting. If it is in the Secure or Off position, the remote key sequences and button resets are ignored.
• Security features (such as OpenBoot security-mode) are disabled.

• Type slowly, no slower than 0.5 seconds and no faster than 5 seconds between characters.

Table 3-1

Command.........Enter this sequence
Remote power off/on....<CR> <CR> <~> <Control-Shift-p> Remote system reset....<CR> <CR> <~> <Control-Shift-r> Remote XIR (CPU) reset...<CR> <CR> <~> <Control-Shift-x>
Key: <CR> = ASCII 0d hexadecimal, <~> = ASCII 7e hexadecimal, <Control-Shift-p> = 10 hexadecimal, <Control-Shift-r> = 12 hexadecimal, <Control-Shift-x> = 18 hexadecimal.

---

Note - The remote console logic circuit continues to receive power, even if you have commanded system power off.

---

The remote system reset command is useful for resetting the system under general conditions. The remote XIR reset command is used for software development and debugging. For a discussion of this command, refer to "Externally Initiated Reset XIR" on page 2.

---

Note - Since the remote console logic looks for certain patterns on the ttya line in the hardware that can be used to reset the machine, it is important that only authorized personnel have access to the ttya serial port.

---