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Host Watchdog, Rocker Switch, and Secure Mode Settings

To promote higher system availability, you should enable the host watchdog feature so that an automatic reset of the system is possible in cases where the host watchdog has determined that the Solaris OS has stopped. You can enable the host watchdog feature by using the setupsc command, as shown in the following example:

lom> setupsc
System Controller Configuration
-------------------------------
SC POST diag Level [off]: max
Host Watchdog [enabled]: enabled
Rocker Switch [disabled]: disabled
Secure Mode [off]: on

NOTE

The host watchdog timeout is 2 minutes.

The SC also uses a watchdog function to cause it to restart if the SC crashes or hangs for any reason. The SC watchdog timeout is 60 seconds. If this watchdog times out, it will cause an automatic restart of the SC. The SC watchdog is permanently enabled, so there is no method of disabling it manually.

The SC POST output appears only on the SC serial connection. You might need to run POST at the max level if a problem with the SC is suspected. You can use the setupsc command to change the POST level to off, min, or max.

To prevent the accidental operation of the On/Standby switch, it is recommended that the rocker switch be disabled. Setting the secure mode by using the setupsc command does not prevent the On/Standby rocker switch from shutting down the system. The rocker switch will power off all of the FRUs (field replaceable units) to standby mode.

The secure mode feature in the setupsc command enables or disables the use of the reset and break commands. When secure mode is enabled, the reset and break commands are disabled. It is recommended to have the secure mode enabled to prevent the malicious use of the reset or break command. After you set the password for the SC, the user is prompted for the password before a new setting for secure mode is accepted.

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