Hitachi F350 - Page 59

State Controller DBS/DBSE drive tray
Opera
ting
60 dB
(Environmental
temperature 32°C or
less)
1
60 dB (Environmental temperature 32°C or less)
1
,
2
,
3
Non-
opera
ting
55 dB 55 dB
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 conguration, 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
conguration, and operating status.
Noise Level
State Condition
Operating (Recommended) 90 dB or less
*
Note:
*
Fire suppression systems and acoustic noise:
Some data center inert gas re 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 dierent 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.
Environmental specications
Appendix B: System specications
Hitachi Virtual Storage Platform F350, F370 Hardware Reference Guide 59