IBM DS8700, Введение и руководство по планированию

Страница: 187 / 256

Table 58. Acoustic declaration for the DS8000 series, including the DS8800
Product Description Declared A-Weighted Sound
Power Level, LWAd (B) Declared A-Weighted Sound
Pressure Level, LpAm (dB)
Operating Idling Operating Idling
DS8800 fully
configured Model 951 7.9 7.9 60 60
DS8000 with 240 hard
disk drives 7.5 7.5 56 56
Notes:
v
LWAd is the statistical upper-limit A-weighted sound power level (rounded to the
nearest 0.1 B).
v LpAm is the mean A-weighted emission sound pressure level measured at the 1-meter
bystander positions (rounded to the nearest dB).
v
10 dB (decibel) = 1 B (bel).
v
All measurements made in conformance with ISO 7779 and declared in conformance
with ISO 9296.
Planning for environmental requirements
You must install your storage unit in a location that meets the operating
environment requirements to properly maintain your DS8000 storage unit.
Take the following steps to ensure that you meet these requirements:
1. Note where air intake locations are on the models that compose your storage
unit.
2. Verify that you can meet the environmental operating requirements at the air
intake locations.
3.
Consider optimizing the air circulation and cooling for the storage unit by
using a raised floor, adjusting the floor layout, and adding perforated tiles
around the air intake areas.
Fans and air intake areas
The DS8000 models provide air circulation through various fans throughout the
frame. You must maintain the correct operating environment requirements for your
models at each air intake location.
Table 59 summarizes fan, intake, and exhaust locations.
Table 59. Machine fan location
DS8800 Fan Location Machine Location Intake Location Exhaust Location
Entire machine Entire Front covers Rear covers
Power complex Left-side Front covers Rear covers
Operating environment requirements
You must meet specific operating environment requirements at all the air intake
locations of your DS8000 models.
The operating points vary depending on the state of the model. The models can be
in the following states:
v
Powered on
v Powered off
Chapter 6. Meeting DS8000 series delivery and installation requirements
165