Hitachi G370 Hardware Reference Manual page 87

State Controller
Opera 60 dB
ting (Environmental
temperature 32°C
1
or less)
Non- 55 dB
opera
ting
Notes:
1. The internal temperature of the system controls the rotating speed of the fan
module. Therefore, this standard value might be exceeded if the maximum load
continues under high-temperature environment or if a failure occurs in the
system.
2. Sound pressure level (LA) changes from 66 dB or 75 dB, according to the ambient
temperature, drive configuration, and operating status. Maximum volume can
reach 79 dB during maintenance procedure for a failed ENC or power supply.
3. Acoustic power level (LwA) measured by the ISO 7779 standard is 7.2 B. This value
changes from 7.2 B to 8.1 B, according to the ambient temperature, drive
configuration, and operating status.
4. When accessing the dense intermix drive tray, do not work for long times at the
rear of the rack.
Noise Level
State
Operating (Recommended)
Note:
*
Fire suppression systems and acoustic noise:
Some data center inert gas fire suppression systems when activated release gas from
pressurized cylinders that moves through the pipes at very high velocity. The gas exits
through multiple nozzles in the data center. The release through the nozzles could
generate high-level acoustic noise. Similarly, pneumatic sirens could also generate
high-level acoustic noise. These acoustic noises may cause vibrations to the hard disk
drives in the storage systems resulting in I/O errors, performance degradation in and
to some extent damage to the hard disk drives. Hard disk drives (HDD) noise level
tolerance may vary among different models, designs, capacities and manufactures. The
acoustic noise level of 90 dB or less in the operating environment table represents the
current operating environment guidelines in which Hitachi storage systems are
designed and manufactured for reliable operation when placed 2 meters from the
source of the noise.
Appendix B: System specifications
Hitachi Virtual Storage Platform G350, G370 Hardware Reference Guide
DBS, DBL drive trays
60 dB (Environmental
temperature 32°C or
1
less)
55 dB
90 dB or less
Environmental specifications
DB60 drive tray
71 dB (Environmental
temperature 32°C or less)
3 4
,
71 dB (Environmental
temperature 32°C or less)
3 4
,
Condition
*
1 2
, ,
1 2
, ,
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