Operating limits
A-5
Technical specifications
Operating limits
The ambient temperature specification is measured at the front bezel
inlet. The site must have air conditioning of the correct size and
placement to maintain the specified ambient temperature range. The
air conditioning must be able to handle the heat dissipation
requirements of the disk enclosures.
The operating limits for temperature and humidity must not be exceeded
inside the closed cabinet in which the DAE2Ps are mounted. Mounting
equipment in a cabinet directly above or below a DAE2P/DAE3P does not
restrict air flow to the disk enclosure, because air flows through the enclosure
from front to back. Cabinet doors must not impede the front-to-back air flow.
Environmental recovery
If the system exceeds maximum ambient temperature by
approximately 10°C/18°F, the storage processors will begin an
orderly shutdown that saves cached data, shuts off the SPs, and — in
a DPE2 enclosure — powers down the disks. LCCs in each
DAE2P/DAE3P will power down their disks but remain powered on.
If the system detects that the temperature has dropped to an
acceptable level, it restores power to the storage processors (which
power up any disks in their enclosure), and the LCCs restore power
to their disk drives.
Requirement Description
Ambient temperature 10
o
C to 40
o
C (50
o
F to 104
o
F)
Temperature gradient 10
o
C/hr (18
o
F/hr)
Relative humidity 20% to 80% noncondensing
Elevation 2438 m (8,000 ft) at 40
o
C, 3077 m (10,000 ft) at 37
o
C
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