Lenovo ThinkSystem SN550 Maintenance Manual Download

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– 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.

• Back up all important data before you make changes related to the disk drives.

• Have a small flat-blade screwdriver, a small Phillips screwdriver, and a T8 torx screwdriver available.

• To view the error LEDs on the system board and internal components, leave the power on.

• You do not have to turn off the server to remove or install hot-swap power supplies, hot-swap fans, or hot-

plug 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.

• Blue on a component indicates touch points, where you can grip to remove a component from or install it

in the server, open or close a latch, and so on.

• The Red strip on the drives, adjacent to the release latch, indicates that the drive can be hot-swapped if

the server and operating system support hot-swap capability. This means that you can remove or install
the drive while the server is still running.

Note:

See the system specific instructions for removing or installing a hot-swap drive for any additional

procedures that you might need to perform before you remove or install the drive.

• After finishing working on the server, make sure you 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:

• Each of the drive bays has a drive or a filler panel and electromagnetic compatibility (EMC) shield installed

in it.

• Each of the power-supply bays has a power supply or a filler installed in it.

• If the server has redundant power, each of the power-supply bays has a power supply installed in it.

• There is adequate space around the server to allow the server cooling system to work properly. Leave

approximately 50 mm (2.0 in.) of open space around the front and rear of the server. Do not place objects
in front of the fans. For proper cooling and airflow, replace the server cover before you turn on the server.
Operating the server for extended periods of time (more than 30 minutes) with the server cover removed
might damage server components.

• You do not operate the server without the air baffle installed. Operating the server without the air baffle

might cause the processor to overheat.

• Processor socket 2 always contains either a socket cover or a processor and heat sink.

• You have installed the fifth and sixth fans when you installed the second processor option.

Working inside the server with the power on

You might need to keep the power on with the server cover removed to look at system information on the
display panel or to replace hot-swap components. Review these guidelines before doing so.

Attention:

The server might stop and loss of data might occur when internal server components are exposed

to static electricity. To avoid this potential problem, always use an electrostatic-discharge wrist strap or other
grounding systems when working inside the server with the power on.

• Avoid loose-fitting clothing, particularly around your forearms. Button or roll up long sleeves before

working inside the server.

ThinkSystem SN550 Compute Node Maintenance Manual