System Reliability Guidelines - Lenovo NeXtScale n1200 Installation And Service Manual

For additional information about tools for updating, managing, and deploying firmware, see the
ToolsCenter for System x and BladeCenter at https://support.lenovo.com/us/en/ documents/LNVO-
CENTER
• Before you install optional hardware, make sure that the compute nodes are working correctly. Start the
compute nodes, and make sure that the operating system starts, if an operating system is installed, or that
a 19990305 error code is displayed, indicating that an operating system was not found but the compute
node is otherwise working correctly. If the compute node is not working correctly, see Running DSA
Preboot diagnostic programs for information about how to run diagnostics.
• Observe good housekeeping in the area where you are working. Place removed covers and other parts in
a safe place.
• Do not attempt to lift an object that you think is too heavy for you. If you have to lift a heavy object,
observe the following precautions:
– Make sure that you can stand safely without slipping.
– Distribute the weight of the object equally between your feet.
– Use a slow lifting force. Never move suddenly or twist when you lift a heavy object.
– To avoid straining the muscles in your back, lift by standing or by pushing up with your leg muscles.
• Make sure that you have an adequate number of properly grounded electrical outlets for the server,
monitor, and other devices.
• Back up all important data before you make changes to disk drives.
• After the fan power control is installed, back up the chassis midplane VPD data immediately for future
data migration in case of the fan power control replacement (see "System information options" on page
73).
• Have a small flat-blade screwdriver available.
• To view the error LEDs on the system board and internal components, leave the compute node connected
to power.
• You do not have to turn off the server to install or replace hot-swap power supplies, hot-swap fans, fan
power control, or hot-plug Universal Serial Bus (USB) devices. However, you must turn off the server
before you perform any steps that involve removing or installing adapter cables and you must disconnect
the power source from the server before you perform any steps that involve removing or installing a riser
card.
• Before you remove a compute node from the chassis, you must shut down the operating system and turn
off the compute node. You do not have to shut down the chassis itself.
• Blue on a component indicates touch points, where you can grip the component to remove it from or
install it in the server, open or close a latch, and so on.
• Orange on a component or an orange label on or near a component indicates that the component can be
hot-swapped, which means that if the server and operating system support hot-swap capability, you can
remove or install the component while the server is running. (Orange can also indicate touch points on
hot-swap components.) See the instructions for removing or installing a specific hot-swap component for
any additional procedures that you might have to perform before you remove or install the component.
• When you are finished working on the server, reinstall all safety shields, guards, labels, and ground wires.

System reliability guidelines

The system reliability guidelines to ensure proper system cooling.
To help ensure proper system cooling and system reliability, make sure that the following requirements are
met:
• To ensure proper cooling, do not operate the chassis without a compute node or a filler in each node bay.
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Lenovo NeXtScale n1200 Enclosure Installation and Service Guide