Appendix B Maintaining the
Maintaining Your Site Environment
Temperature
Temperature extremes can cause a variety of problems, including premature aging and failure of chips or mechanical failure of appliances. Extreme temperature fluctuations can cause chips to become loose in their sockets and can cause expansion and contraction of disk drive platters, resulting in read or write data errors.
To minimize the negative effects of the temperature on system performance, follow these guidelines:
•Ensure that the system is operated in an environment that does not exceed 0 to 40ºC (32 to 104ºF) in either direction. The upper end of operating temperature above applies up to an altitude of 1,000 meters (3,281 feet) and then subtract 3ºC for each additional 1,000 meters up to a maximum operational altitude of 3,000 meters (9,843 feet).
•Ensure that the system has adequate ventilation. Do not place it within a
Adequate ventilation is particularly important at high altitudes. System performance may not be optimum when the system is operating at high temperatures as well as high altitudes.
•Make sure that all slots and openings on the system remain unobstructed, especially the fan vent on the back of the system.
•Clean the system at regular intervals to avoid any buildup of dust and debris, which can cause a system to overheat.
•If the system has been exposed to abnormally cold temperatures, allow a
•If intermittent system failures are noticed, try reseating any socketed chips, which might have become loose because of temperature fluctuations.
Humidity
Each system is rated to operate at 10 to 90 percent
Altitude
Operating a system at high altitude (low pressure) reduces the efficiency of forced and convection cooling and can result in electrical problems related to arcing and corona effects. This condition can also cause sealed components with internal pressure, such as electrolytic capacitors, to fail or perform at reduced efficiency.
Cisco Wide Area Virtualization Engine 594 and 694 Hardware Installation Guide
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