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The automatic restart options are:
 Restart automatically after a power failure. The power management unit
automatically starts up the server after a power failure.
 Restart automatically if the computer freezes. The power management unit
automatically starts up the server after the server stops responding, has a kernel
panic, or freezes.
When you select the option to restart after a freeze, Mac OS X Server spawns the
watchdogtimerd daemon, which every 30 seconds commands your computer to
restart after 5 minutes.
Each time the command is sent, the restart timer is reset. Thus, the timer won’t
reach 5 minutes as long as the server is running. If the computer freezes, the power
management unit restarts it after 5 minutes.
To enable automatic restart:
1 Log in to the server as an administrator.
2 Open System Preferences and click Energy Saver.
3 Select restart options.
4 Close System Preferences.
Ensuring Proper Operational Conditions
One factor that can cause your servers to malfunction is overheating. This is especially
a problem when you cluster computers in a small space. Other factors such as
humidity and power surges can also adversely impact your server.
To protect your servers, make sure you house them in a place where you can control
these factors and provide ideal operating conditions. Check the electrical and
environmental requirements for your systems to nd what these conditions are.
In addition, make sure the facility you deploy your server has a re alarm, and prepare
a contingency plan to deal with this risk.
Providing Open Directory Replication
If you plan to provide Open Directory services, consider creating replicas of your Open
Directory master. If the master server fails, client computers can access the replica.
162 Chapter 7 Ongoing System Management