Sun Microsystems 15K/9960, Site Planning Manual

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10 Cluster Platform 15K/9960 System Site Planning Guide • January 2002
systems go down for a period of time. Though individual standards vary slightly, 70
degrees F to 74 degrees F (21 degrees C to 23 degrees C) should be used as an
optimal temperature choice.
The suggested ambient relative humidity levels between 45% and 50% are the most
suitable for safe data processing operations. Under certain circumstances, most
processing equipment can operate within a fairly wide environmental range (20% to
80%), but the optimal goal should be between 45% to 50% for several reasons:
■
The optimal range helps protect computer systems from corrosive problems
associated with high humidity levels.
■
It provides the greatest operating time buffer in the event of environmental
control system failure.
■
This range helps avoid failures or temporary malfunctions caused by intermittent
interference from static discharges that occur when relative humidity is too low.
Electrostatic discharge (ESD) is easily generated and less easily dissipated in areas
where the relative humidity is below 35%, and becomes critical when levels drop
below 30%. The 5% relative humidity range may seem unreasonably tight when
compared to the guidelines used in typical office environments or other loosely
controlled areas, but it is not so difficult to maintain in a data center because of the
high efficiency vapor barrier and low rate of air changes normally present.
Basic Power and Cooling Requirements
TABLE 3-2
contains the power and air conditioning information for the Cluster
Platform 15K/9960 system.
The dynamics of the Cluster Platform 15K/9960 system power dissipation depends
on application and configuration.
TABLE 3-2
Cluster Platform 15K/9960 System Power and Cooling Requirement
Component Power (Watts)
Air Conditioning
(Btu/Hr)
Server cabinet 1 24,000 81,116
Server cabinet 2 24,000 81,116
Storage array cabinet 6436 11,669
Storage controller cabinet 4169 7916