IBM DS8900F User Manual

Table 58. Operational shock levels
Class Axis g
1
pw
2
S1 Vertical 3.5 3.0
Notes:
1. g is the peak g level of an approximate half-sine pulse.
2. "pw" is the pulse width in milliseconds.
Contamination information
You must consider the air quality and contamination levels at your installation site.
Airborne particulates (including metal flakes or particles) and reactive gases that act alone or in
combination with other environmental factors, such as humidity or temperature, might pose a risk to the
storage system hardware. Risks that are posed by the presence of excessive particulate levels or
concentrations of harmful gases include damage that might cause the system to malfunction or cease
functioning altogether. This specication presents limits for particulates and gases that are intended to
avoid such damage. The limits must not be viewed or used as denitive limits because numerous other
factors, such as temperature or moisture content of the air, can influence the impact of particulates or
environmental corrosives and gaseous contaminant transfer.
Attention: In the absence of specic limits that are presented in this document, you must
implement practices that maintain particulate or gas levels that are consistent with the protection
of human health and safety. If it is determined that the levels of particulates or gases in your
environment damaged the storage system, the warranty is void. Implementation of correctional
measures is a customer responsibility.
The following criteria must be met:
Gaseous contamination
Severity level G1 according to ANSI/ISA 71.04-1985
1
, which states that the reactivity rate of copper
coupons must be fewer than 300 Angstroms per month (Å/month, ≈ 0.0039 μg/cm2-hour weight
gain)
2
. In addition, the reactivity rate of silver coupons must be less than 300Å/month (≈ 0.0035 μg/
cm2-hour weight gain)
3
. The reactive monitoring of gaseous corrosivity is conducted approximately 2
inches (5 cm) in front of the rack on the air inlet side at one-quarter and three-quarter frame height off
the floor, or where the air velocity is much higher.
Particulate contamination
Data centers must meet the cleanliness level of ISO 14644-1 class 8. For data centers without airside
economizers, the ISO 14644-1 class 8 cleanliness can be met by selecting one of the following
ltration methods:
• The room air can be continuously ltered with MERV 8 lters.
• Air entering a data center can be ltered with MERV 11, or preferably MERV 13 lters.
For data centers with airside economizers, the choice of lters to achieve ISO class 8 cleanliness
depends on the specic conditions present at that data center. The deliquescent relative humidity of
the particulate contamination must be more than 60% RH
4
. Data centers must be free of zinc
whiskers
5
.
1. ANSI/ISA-71.04.1985. Environmental conditions for process measurement and control systems:
Airborne contaminants. Instrument Society of America, Research Triangle Park, NC, 1985.
2. The derivation of the equivalence between the rate of copper corrosion product thickness growth in Å/
month and the rate of weight gain assumes that Cu
2
S and Cu
2
O grow in equal proportions.
3. The derivation of the equivalence between the rate of silver corrosion product thickness growth in Å/
month and the rate of weight gain assumes that Ag
2
S is the only corrosion product.
4. The deliquescent relative humidity of particulate contamination is the relative humidity at which the
dust absorbs enough water to become wet and promote corrosion, ion migration, or both.
Chapter 6. Delivery and installation requirements
101

IBM DS8900F Specifications

General

Brand	IBM
Model	DS8900F
Category	Storage
Language	English