Lenovo thinksystem SN850 7X15, Setup Manual

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• You do not have to turn off the compute node to remove or install hot-swap power supplies, hot-swap
fans, or hot-plug USB devices. However, you must turn off the compute node before you perform any
steps that involve removing or installing adapter cables, and you must disconnect the power source from
the compute node 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 compute node, 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 if the compute node and operating system support hot-swap capability, which means that
you can remove or install the component while the compute node is still 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.
• The Red strip on the drives, adjacent to the release latch, indicates that the drive can be hot-swapped if
the compute node and operating system support hot-swap capability. This means that you can remove or
install the drive while the compute node 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 compute node, make sure you reinstall all safety shields, guards, labels, and
ground wires.
System reliability guidelines
Review the system reliability guidelines to ensure proper system cooling and reliability.
Make sure the following requirements are met:
• To ensure proper cooling, the Flex System chassis is not operated without a compute node or node bay
filler in each node bay.
• Adequate space around the compute node must be spared to allow compute node cooling system to
work properly. Leave approximately 50 mm (2.0 in.) of open space around the front and rear of the
compute node. Do not place any object in front of the fans.
• For proper cooling and airflow, refit the compute node cover before you turn the power on. Do not operate
the compute node for more than 30 minutes with the compute node cover removed, for it might damage
compute node components.
• Cabling instructions that come with optional components must be followed.
• A failed fan must be replaced within 48 hours since malfunction.
• A removed hot-swap fan must be replaced within 30 seconds after removal.
• A removed hot-swap drive must be replaced within two minutes after removal.
• Every air baffle that comes with the compute node must be installed when the compute node starts (some
compute nodes might come with more than one air baffle). Operating the compute node with a missing air
baffle might damage the processor.
• All processor sockets must contain either a socket cover or a processor with heat sink.
• When more than one processor is installed, fan population rules for each compute node must be strictly
followed.
Working inside the compute node with the power on
Guidelines to work inside the compute node with the power on.
Chapter 3
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Compute node hardware setup
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