Cisco SNS-3400 Series User manual

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Cisco Systems, Inc. www.cisco.com
Maintaining the CSACS-1121, Cisco
SNS-3400 Series, and Cisco SNS-3500
series Appliances
The CSACS-1121, Cisco SNS-3415, and Cisco SNS-3495 Series appliances are configured to order and is ready for
installation when it leaves the factory. After you install and configure your appliance, you may have to perform specific
maintenance procedures and operations to ensure that the appliance is operating properly.
These preventive procedures will maintain your appliance in good operating condition and minimize the need for costly,
time-consuming service procedures.
Caution: To help prevent problems, before performing any procedures in this chapter, review Safety Warnings,
page 7 and the Safety Guidelines, page 1 sections.
The following sections discuss various environmental factors that can adversely affect appliance performance and
longevity. This section includes:
Maintaining the CSACS-1121 Series Appliance, page 1
Maintaining Cisco the SNS-3415/3495 Appliance, page 5
Maintaining the CSACS-1121 Series Appliance
Maintaining Your Site Environment
Good preventive maintenance includes regular visual inspections of the appliance, including exterior cleaning and
inspection.
This chapter contains:
General Exterior Cleaning and Inspection, page 2
Cooling, page 2
Temperature, page 3
Humidity, page 3
Altitude, page 4
Electrostatic Discharge, page 4
Electromagnetic and Radio Frequency Interference, page 4
Magnetism, page 4
Power Source Interruptions, page 5

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Maintaining the CSACS-1121, Cisco SNS-3400 Series, and Cisco SNS-3500 series Appliances
Maintaining the CSACS-1121 Series Appliance
General Exterior Cleaning and Inspection
This section details the cleaning requirements for exterior surfaces of the appliance. It also provides information on
inspecting cables and adapter cards.
Caution: Never spray cleaning solution on the surfaces of the appliance. Over spray can penetrate into the
appliance and cause electrical problems and corrosion.
Appliance
Use a lint-free, nonabrasive cloth to perform cleaning. Do not use a solvent, abrasive cleaning agents, or tissue paper. If
the appliance is dirty (for example, with thick dust), use a soft damp cloth and gently wipe the surface of the appliance.
Immediately wipe any water or liquid off from the appliance.
Dust and Particles
A clean operating environment can greatly reduce the negative effects of dust and other particles, which act as insulators
and interfere with the operation of an appliance’s mechanical components. In addition to regular cleaning, you should
follow these guidelines to deter contamination of the appliance:
Do not permit smoking anywhere near the appliance.
Do not permit food or drink near the appliance.
Cables and Connectors
Periodically inspect cables and connectors to and from your appliance periodically to see if they are worn out or loose.
Adapter Cards
Check the connections on the adapter cards. Ensure that they are secured to the appliance and have not been jarred
loose or mechanically damaged.
Corrosion
The oil from a person’s fingers, or prolonged exposure to high temperature or humidity, can corrode the gold-plated
edge connectors and pin connectors on adapter cards in the appliance. This corrosion on adapter card connectors is a
gradual process that can eventually lead to intermittent failure of electrical circuits.
To prevent corrosion, you should avoid touching contacts on adapter cards. Protecting the appliance from corrosive
elements is especially important in moist and salty environments, which tend to promote corrosion. Also, as a further
deterrent to corrosion, the appliance should not be used in extreme temperatures, as explained in the Temperature,
page 3 section.
Cooling
Exhaust fans in the power supply and in the appliance cool the power supply and the appliance by drawing air in through
various openings in the front of the appliance and blowing it out the back.
However, the fans also draw dust and other particles into the appliance, causing contaminant buildup, which results in
an increase in the appliance’s internal temperature and interferes with the operation of various appliance components.
To avoid these conditions, we recommend keeping your work environment clean to reduce the amount of dust and dirt
around the appliance, thereby reducing the amount of contaminants drawn into the appliance by the fans.

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Maintaining the CSACS-1121, Cisco SNS-3400 Series, and Cisco SNS-3500 series Appliances
Maintaining the CSACS-1121 Series Appliance
Temperature
Temperature extremes can cause a variety of problems, including premature aging and failure of integrated circuits (ICs)
or mechanical failure of devices. Extreme temperature fluctuations can cause ICs to become loose in their sockets,
causing expansion and contraction of disk drive platters, resulting in read or write data errors.
The heat emission of an ACS appliance would be in the range of 341 to 1024 BTUs (100 to 300 W).
To minimize the negative effects of temperature on appliance performance, follow these guidelines:
Table 1 on page 3 lists the air temperature that you must maintain according to the altitude where your ACS server
is placed.
.
Ensure that the appliance has adequate ventilation. Do not place it within a closed-in wall unit or on top of cloth,
which can act as insulation. Do not place it where it will receive direct sunlight, particularly in the afternoon. Do not
place it next to a heat source of any kind, including heating vents during winter.
Adequate ventilation is particularly important at high altitudes. Appliance performance may not be optimum when the
appliance is operating at high temperatures as well as high altitudes. Do the following:
Ensure that all slots and openings on the appliance remain unobstructed, especially the fan vents on the back of the
appliance.
Clean the appliance at regular intervals to avoid any buildup of dust and debris, which can cause the appliance to
overheat.
If the appliance has been exposed to abnormally cold temperatures, allow a 2-hour warm-up period to bring it up
to normal operating temperature before turning it on. Failure to do so may cause damage to internal components,
particularly the hard disk drive.
Humidity
High-humidity conditions can cause moisture migration and penetration into the appliance. This moisture can cause
corrosion of internal components and degradation of properties such as electrical resistance, thermal conductivity,
physical strength, and size. Extreme moisture buildup inside the appliance can result in electrical shorts, which can cause
serious damage to the appliance.
Each appliance is rated to operate at 8 to 80 percent relative humidity, with a humidity gradation of 10 percent per hour.
Buildings in which climate is controlled by air conditioning in the warmer months and by heat during the colder months
usually maintain an acceptable level of humidity for appliances.
However, if an appliance is located in an unusually humid location, a dehumidifier can be used to maintain the humidity
within an acceptable range.
Table 1 Air Temperature Maintenance
Server State Altitude Air Temperature
On 3000 ft (0 to 914.4 m) 50.0° to 95.0°F (10° to 35°C)
On 3000 ft (914.4 m) to 7000 ft
(2133.6 m)
50.0° to 89.6°F (10° to 32°C)
Off Maximum altitude: 7000 ft
(2133.6 m)
50.0° to 109.4°F (10° to 43°C)
Shipping Maximum altitude: 7000 ft
(2133.6 m)
-40° to 140°F (40° to 60°C)

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Maintaining the CSACS-1121, Cisco SNS-3400 Series, and Cisco SNS-3500 series Appliances
Maintaining the CSACS-1121 Series Appliance
Altitude
Operating an appliance at high altitudes (low atmospheric pressure) reduces the efficiency of forced and convection
cooling which 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.
Electrostatic Discharge
Electrostatic discharge (ESD) results from the buildup of static electricity on the human body and certain other objects.
This static electricity is often produced by simple movements, such as walking across a carpet.
ESD is a discharge of a static electrical charge that occurs when a person whose body contains such a charge touches
a component in the appliance. This static discharge can cause components, especially ICs, to fail. ESD is a problem
particularly in dry environments where the relative humidity is below 50 percent.
To reduce the effects of ESD, you should observe the following guidelines:
Wear a grounding wrist strap. If a grounding wrist strap is unavailable, touch an unpainted metal surface on the
appliance chassis periodically to neutralize any static charge.
Keep components in their anti-static packaging until they are installed.
Avoid wearing clothing made of wool or synthetic materials.
Electromagnetic and Radio Frequency Interference
Electromagnetic interference (EMI) and radio frequency interference (RFI) from an appliance can adversely affect devices
such as radio and television receivers operating near the appliance. Radio frequencies emanating from an appliance can
also interfere with cordless and low-power telephones.
RFI is defined as any EMI with a frequency above 10 kHz. This type of interference can travel from the appliance to other
devices through the power cable and power source, or through the air, like transmitted radio waves. The Federal
Communications Commission (FCC) publishes specific regulations to limit the amount of EMI and RFI emitted by
computing equipment. Each appliance meets these FCC regulations.
To reduce the possibility of EMI and RFI, follow these guidelines:
Operate the appliance only with the appliance cover installed.
Ensure that the screws on all peripheral cable connectors are securely fastened to their corresponding connectors
on the back of the appliance.
Always use shielded cables with metal connector shells for attaching peripherals to the appliance.
Magnetism
Hard disk drives are susceptible to the effects of magnetism as they store data magnetically. Hard disk drives should
never be stored near magnetic sources such as:
Monitors
Printers
Telephones with real bells
Fluorescent lights

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Maintaining the CSACS-1121, Cisco SNS-3400 Series, and Cisco SNS-3500 series Appliances
Maintaining Cisco the SNS-3415/3495 Appliance
Power Source Interruptions
Appliances are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage, undervoltage,
and transients (or spikes) can erase data from the memory or even cause components to fail. To protect against these
types of problems, power cables should always be properly grounded and one, or both, of the following methods should
be used:
Place the appliance on a dedicated power circuit (rather than sharing a circuit with other electrical equipment). In
general, do not allow the appliance to share a circuit with any of the following:
—Copier machines
—Teletype machines
—Laser printers
—Fax machines
—Any other motorized equipment
Besides the above equipment, the greatest threats to an appliance’s power supply are surges or blackouts caused by
electrical storms.
If a blackout occurs—even a temporary one—while the appliance is turned on, turn off the appliance immediately and
disconnect it from the electrical outlet. Leaving the appliance on may cause problems when the power is restored.
Maintaining Cisco the SNS-3415/3495 Appliance
Caution: To help prevent problems, before performing any procedures in this chapter, review Safety Warnings,
page 7 and the Safety Guidelines, page 1 sections.
To maintain the Cisco SNS-3415 or Cisco SNS-3495 appliance, see Maintaining the Server Chapter in the Cisco UCS
C220 M3 Server Installation and Service Guide.
Maintaining Cisco the SNS-3515/3595 Appliance
Caution: To help prevent problems, before performing any procedures in this chapter, review Safety Warnings,
page 7 and the Safety Guidelines, page 1 sections.
To maintain the Cisco SNS-3515 or Cisco SNS-3595 appliance, see Maintaining the Server Chapter in the Cisco UCS
C220 M4 Server Installation and Service Guide.

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Maintaining the CSACS-1121, Cisco SNS-3400 Series, and Cisco SNS-3500 series Appliances
Maintaining Cisco the SNS-3515/3595 Appliance