System Reliability Guidelines; Handling Static-Sensitive Devices - Lenovo Flex System Fabric CN4093 Installation Manual

System Reliability Guidelines

Handling Static-Sensitive Devices

© Copyright Lenovo 2017
To help ensure proper cooling, performance, and system reliability, make sure that
the following requirements are met:
Each of the bays on the rear of the Lenovo Flex System chassis contains either a

module or a filler module.
 A removed hot‐swap module is replaced with an identical module or filler
module within one minute of removal.
 A removed hot‐swap compute node is replaced with another compute node or
filler node within one minute of removal.
 The ventilation areas on the sides of the compute node are not blocked.
You have followed the reliability guidelines in the documentation that comes

with the Lenovo Flex System chassis.
Attention: Static electricity can damage the switch and other electronic devices. To
avoid damage, keep static‐sensitive devices in their static‐protective packages until
you are ready to install them.
To reduce the possibility of electrostatic discharge, observe the following
precautions:
Limit your movement. Movement can cause static electricity to build up around

you.
 The use of a grounding system is recommended. For example, wear an
electrostatic‐discharge wrist strap, if one is available.
 Handle the device carefully, holding it by its edges or its frame.
 Do not touch solder joints, pins, or exposed printed circuitry.
 Do not leave the device where others can handle and damage it.
 While the device is still in its static‐protective package, touch it to an unpainted
metal part of any unpainted metal surface on a grounded rack component in the
rack in which you are installing the device, for at least two seconds. This drains
static electricity from the package and from your body.
 Remove the device from its package and install it directly into the switch
without setting it down. If it is necessary to set down the device, put it back into
its static‐protective package. Do not place the device on a switch cover or on a
metal surface.
 Take additional care when you handle devices during cold weather. Heating
reduces indoor humidity and increases static electricity.
 Some types of Lenovo Flex System chassis come with electrostatic discharge
(ESD) connectors. If your unit is equipped with an ESD connector, see the
documentation that comes with the Lenovo Flex System chassis for using the
ESD connector.
Chapter 2: Installing and Removing the CN4093
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