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Table 2. Limits for particulates and gases
Contaminant
Limits
Gaseous
Severity level G1 as per ANSI/ISA 71.04-1985
coupons shall be less than 300 Angstroms per month (Å/month, ≈ 0.0039 μg/cm
gain).
μg/cm
approximately 5 cm (2 in.) 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
Data centers must meet the cleanliness level of ISO 14644-1 class 8. For data centers without
airside economizer, the ISO 14644-1 class 8 cleanliness might be met by choosing one of the
following filtration methods:
• The room air might be continuously filtered with MERV 8 filters.
• Air entering a data center might be filtered with MERV 11 or preferably MERV 13 filters.
For data centers with airside economizers, the choice of filters to achieve ISO class 8 cleanliness
depends on the specific conditions present at that data center.
The deliquescent relative humidity of the particulate contamination should be more than 60%
RH.
4
Data centers must be free of zinc whiskers.
1
ANSI/ISA-71.04-1985. Environmental conditions for process measurement and control systems: Airborne
contaminants. Instrument Society of America, Research Triangle Park, North Carolina, U.S.A.
2
The derivation of the equivalence between the rate of copper corrosion growth in the thickness of the corrosion
product in Å/month and the rate of weight gain assumes that Cu
3
The derivation of the equivalence between the rate of silver corrosion growth in the thickness of the corrosion
product in Å/month and the rate of weight gain assumes that Ag
4
The deliquescent relative humidity of particulate contamination is the relative humidity at which the dust absorbs
enough water to become wet and promote ionic conduction.
5
Surface debris is randomly collected from 10 areas of the data center on a 1.5 cm diameter disk of sticky
electrically conductive tape on a metal stub. If examination of the sticky tape in a scanning electron microscope
reveals no zinc whiskers, the data center is considered free of zinc whiskers.
Firmware updates
Several options are available to update the firmware for the server.
You can use the tools listed here to update the most current firmware for your server and the devices that are
installed in the server.
Note: Lenovo typically releases firmware in bundles called UpdateXpress System Packs (UXSPs). To ensure
that all of the firmware updates are compatible, you should update all firmware at the same time. If you are
updating firmware for both the Lenovo XClarity Controller and UEFI, update the firmware for Lenovo XClarity
Controller first.
Best practices related to updating firmware is available at the following location:
http://lenovopress.com/LP0656
Important terminology
• In-band update. The installation or update is performed using a tool or application within an operating
system that is executing on the server's core CPU.
In addition, the reactivity rate of silver coupons shall be less than 200Å/month (≈ 0.0035
2
2
-hour weight gain).
3
The reactive monitoring of gaseous corrosivity must be conducted
1
, which states that the reactivity rate of copper
5
S and Cu
O grow in equal proportions.
2
2
S is the only corrosion product.
2
2
-hour weight
.
Chapter 1
Introduction
9
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