Apple Xserve (Cluster Node) - Manual (Page 7)

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Power button and light
Press to turn on the server.
Enclosure lock and lock status light
The lock secures the enclosure and drive modules in the server. It can be locked and
unlocked with the enclosure key supplied with the server.
When the enclosure lock is locked (the light is on), the server may not recognize
peripheral devices such as a keyboard, mouse, or storage device. Unlock the lock to use
those devices.
System identifier button and light
The system identifier light turns on if a problem is detected. It also can be turned on
manually by pressing the button. This indicator is useful for locating a particular unit in a
rack with multiple servers. A duplicate system identifier button and light are on the back
panel.
FireWire 400 port
Provides a FireWire 400 connection on the front of the server. There are also two FireWire
800 ports on the back panel. The enclosure lock must be unlocked for the server to
recognize some devices connected to this port. (See “FireWire Specifications” in
Appendix A of the
Xserve User’s Guide for information about FireWire ports and
connectors.)
Built-in Ethernet link light
This light indicates an Ethernet link.
System activity lights
Two rows of eight lights indicate system activity. The rows of lights operate independently
to show each processor’s activity.
Drive module and lights
The drive module contains the server software and has lights showing operating status and
disk activity. You cannot install additional drive modules in this Xserve model.