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Standard Operating Practices
Caution. Replace only one CRU or FRU at a time. Attempting to replace more than
one hardware component at a time might cause serious system outages, processor halts,
and connectivity problems.
Whenever you replace a CRU or a FRU, use the following standard operating practices to
minimize any potential damage to the equipment:
Complete HP training courses on system support for NonStop S-series servers.
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Inspect the replacement CRU or FRU for any physical damage before installing it.
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Check the connectors on the CRU, FRU, or backplane for bent or broken pins and for
any other obvious damage. If there is damage to the CRU or FRU, you need to order
another one.
Remove all jewelry and metal accessories, such as rings, watches, and necklaces,
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before working with the equipment. These items can damage electrical equipment or
result in personal injury.
Restrain any dangling items that can get caught in electromechanical equipment,
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such as long hair and sleeves, before working with the equipment.
Follow the
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ESD Guidelines for working in an electrostatic discharge (ESD)-protected
environment and for handling CRUs and FRUs.
Avoid permanent damage to components from overheating by observing the time
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limits for an enclosure door to be open with only one fan running.
The following table indicates the amount of time that components in a fully
loaded NonStop S-series system enclosure, with the appearance-side door
open and only one fan operating, can operate before overheating.
Safe Operating Times With Enclosure Door Open
Ambient Room Temperature
Altitude
25°C (77°F)
30°C (86°F)
35°C (95°F)
38°C (100°F)
Sea level
>45 minutes
36 minutes
21 minutes
13 minutes
1,524 meters
38 minutes
22 minutes
13 minutes
8 minutes
(5,000 feet)
3,048 meters
25 minutes
14 minutes
10 minutes
5 minutes
(10,000 feet)
For example, if your computer room has an ambient room temperature of 25°C (77°F)
and is at an altitude of 1,524 meters (5,000 feet), you have approximately 38 minutes to
replace or reinstall the second fan before components inside a system enclosure
overheat.
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