Lenovo 3823, 3821, 3822, 3719 manual Inch hard disk drive backplane connectors, Server power features

2.5-inch hard disk drive backplane connectors

The following illustration shows the connectors on the 2.5-inch hard disk drive backplane.

Hard disk drive connectors

Power connector

Signal connector

Configuration connector

Server power features

When the server is connected to an ac power source but is not turned on, the operating system does not run, and all core logic except for the integrated management module (IMM) is shut down; however, the server can respond to requests from the IMM, such as a remote request to turn on the server. The power-on LED flashes to indicate that the server is connected to ac power but not turned on.

Turning on the server

Approximately 3 minutes after the server is connected to ac power, the power-control button becomes active, and one or more fans might start running to provide cooling while the server is connected to power. You can turn on the server and start the operating system by pressing the power-control button.

The server can also be turned on in any of the following ways:

vIf a power failure occurs while the server is turned on, the server will restart automatically when power is restored.

vIf your operating system supports the Wake on LAN® feature, the Wake on LAN feature can turn on the server.

For 32-bit operating systems only: Some memory is reserved for various system resources and is unavailable to the operating system. The amount of memory that is reserved for system resources depends on the operating system, the configuration of the server, and the configured PCI options.

Chapter 6. Locating Server Controls and connectors 147