HP XP20000/XP24000 HP StorageWorks XP24000/XP20000 Disk Array Site Preparation - Page 34

Humidity specifications, Vibration specifications

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Humidity specifications Maintain the humidity levels specified in Table 7. High humidity levels cause galvanic actions to occur between some dissimilar metals. This eventually causes a high resistance between connections, leading to equipment failure. Low humidity contributes to undesirably high levels of electrostatic charge. This increases the electrostatic discharge (ESD) voltage potential. ESD can cause component damage during servicing operations. Low humidity levels are often the result of the facility heating system and occur during the cold season. Most heating systems provide air with a low humidity level, unless the system has a built-in humidifier. You should not see any condensation in or around the disk array under any conditions. There is no procedure for recovery from moisture condensation. Table 7 Humidity specifications for the XP24000/XP20000 Disk Arrays Humidity range type Recommended operating humidity range at 22 degrees C (71 degrees F) Noncondensing relative humidity (RH) 50% to 55% Operating humidity range at 22 degrees C (71 degrees F) 20% to 80% Non-operating humidity range Shipping and storage humidity range (product packed in factory packing) 8% to 90% 5% to 95% Operating maximum wet bulb temperature 26 degrees C, 79 degrees F Non-operating maximum wet bulb temperature 27 degrees C, 81 degrees F Shipping and storage maximum wet bulb temperature 29 degrees C, 84 degrees F Vibration specifications Continuous vibration can cause a slow degradation of mechanical parts and, when severe, can cause data errors in disk drives. Mechanical connections such as printed circuit assembly (PCA) conductors, cable connectors, and processor backplane wiring can also be affected by vibrations. Vibration specifications apply to all three axes. For specification tests, see ASTM D999-91 Standard Methods for Vibration Testing of Shipping Containers. Table 8 Vibration specifications XP24000/XP20000 Disk Arrays Condition Operating Specification 0.25 mm, 5-10 Hz 0.05 G, 10-300 Hz Non-operating 2.5 mm, 5-10 Hz 0.5 G, 10-70 Hz 0.05 mm, 70-99 Hz 1.0 G, 99-300 Hz 34 Site requirements for the HP Disk Arrays

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Humidity specifications
Maintain the humidity levels specified in
Table 7
. High humidity levels cause galvanic actions to occur
between some dissimilar metals. This eventually causes a high resistance between connections, leading
to equipment failure.
Low humidity contributes to undesirably high levels of electrostatic charge. This increases the electrostatic
discharge (ESD) voltage potential. ESD can cause component damage during servicing operations.
Low humidity levels are often the result of the facility heating system and occur during the cold season.
Most heating systems provide air with a low humidity level, unless the system has a built-in humidifier.
You should not see any condensation in or around the disk array under any conditions. There is no
procedure for recovery from moisture condensation.
Table 7 Humidity specifications for the XP24000/XP20000 Disk Arrays
Noncondensing relative humidity (RH)
Humidity range type
50% to 55%
Recommended operating humidity range
at 22 degrees C (71 degrees F)
20% to 80%
Operating humidity range
at 22 degrees C (71 degrees F)
8% to 90%
Non-operating humidity range
5% to 95%
Shipping and storage humidity range
(product packed in factory packing)
26 degrees C, 79 degrees F
Operating maximum wet bulb temperature
27 degrees C, 81 degrees F
Non-operating maximum wet bulb temperature
29 degrees C, 84 degrees F
Shipping and storage maximum wet bulb temperature
Vibration specifications
Continuous vibration can cause a slow degradation of mechanical parts and, when severe, can cause
data errors in disk drives. Mechanical connections such as printed circuit assembly (PCA) conductors,
cable connectors, and processor backplane wiring can also be affected by vibrations. Vibration
specifications apply to all three axes. For specification tests, see
ASTM D999-91 Standard Methods
for Vibration Testing of Shipping Containers
.
Table 8 Vibration specifications XP24000/XP20000 Disk Arrays
Specification
Condition
0.25 mm, 5
–
10 Hz
0.05 G, 10
–
300 Hz
Operating
2.5 mm, 5
–
10 Hz
0.5 G, 10
–
70 Hz
0.05 mm, 70
–
99 Hz
1.0 G, 99
–
300 Hz
Non-operating
Site requirements for the HP Disk Arrays
34