System Reliability Guidelines - Lenovo System x3550 M5 Installation And Service Manual

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

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 inches) 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 have followed the cabling instructions that come with optional adapters.
• You have replaced a failing fan as soon as you remove the old one.
• You have replaced a hot-swap drive within 2 minutes of removal.
• You have replaced a failed hot-swap power supply within 2 minutes of removal.
• You do not operate the server without the air baffle installed. Operating the server without the air baffle
might cause the microprocessor to overheat.
• Microprocessor socket 2 always contains either a socket cover or a microprocessor and heat sink.
• You have installed the fan 6 and fan 8 when you installed the second microprocessor option.
Working inside the server with the power on
Use this information when working inside the server with the power on.
Attention: Static electricity that is released to internal server components when the server is powered-on
might cause the server to halt, which might result in the loss of data. To avoid this potential problem,
always use an electrostatic-discharge wrist strap or other grounding system when you work inside the
server with the power on.
You might have to have the server turned on while the cover is off, to look at light path diagnostics LEDs or
replace hot swap components. Follow these guidelines when you work inside a server that is turned on:
• Avoid wearing loose-fitting clothing on your forearms. Button long-sleeved shirts before working inside
the server; do not wear cuff links while you are working inside the server.
• Do not allow your necktie or scarf to hang inside the server.
• Remove jewelry, such as bracelets, necklaces, rings, and loose-fitting wrist watches.
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Chapter 5 Removing and replacing components
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