Equipment environment specification
Allowable
2
Recommended
3
Maximum rate
of change
Allowable Recommended Maximum rate of
change
22°C (72°F) for
LTO 9
26°C (79°F) 3050 m (10,000
feet)
15 to 35°C (59
to 95°F)
15 to 25°C (59
to 77°F)
5°C/hour
(9°F/hour)
20% to 80% RH 20% to 50% RH 5% RH/hour with
no condensation
Note:
1. Product equipment is removed from the original shipping container and installed but not in use - for example, during repair, maintenance, or upgrade.
2. Derate maximum dry-bulb temperature 1°C/300 m above 900 m (1.8°F/1,000 feet above 3,000 feet).
3. Derate maximum recommended dry-bulb temperature 1°C/300 m above 1,800 m (1.8°F/1,000 feet above 6,000 feet).
4. Applies to LTO 9 drives
5. Applies to LTO drive generations 1 through 8.
Psychrometric chart
Figure 1. Psychrometric chart showing recommended and allowable operating environments for the tape drive
Notes:
The chart is shown in SI (metric) units and a barometric pressure of 101.325 kPa (sea level).
The recommended operating environment specifies a long-term operating environment that can result in the greatest reliability and energy efficiency.
The allowable operating environment represents where the equipment was tested to verify functions. Due to the stresses that operating in the allowable envelope
can place on the equipment, these envelopes should be used for short-term operation, not continuous operation (for example, in the case of a cooling failure).
Gas and particulate exposure
Table 4. Gas and particulate exposure
Contamination Requirement
Gaseous
contamination
Severity level G1 as per ANSI/ISA 71.04-1985
1
, which states that the reactivity rate of copper coupons shall 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 shall be less than 300 Å/month (≈ 0.0035 µg/cm² -
hour weight gain)
3
. The reactive monitoring of gaseous corrosivity should be conducted 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
contamination
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 the choice of the following filtration:
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.3
4
.Data centers must be free of zinc
whiskers
5
.
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