- Notes, cautions, and warnings
- Additional resources
- Platform Overview
- Technical specifications
- Hardware component descriptions
- Disk-array enclosures
- Cabling
- Rail kits and cables
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Dell Unity™ All Flash and Unity Hybrid Hardware Information Guide
System operating limits
The ambient temperature specification is measured at the rear inlet. The site must have air conditioning of the correct size and placement to maintain the specified ambient temperature range and offset the heat dissipation listed below.
| Requirement | Description |
|---|---|
| Ambient temperature | 10° C to 50° C (50° F to 122° F) 1 |
| Temperature gradient | 10° C/hr (18° F/hr) |
| Relative humidity (extremes) | 20% to 80% noncondensing |
| Relative humidity (recommended2) | 40% to 50% noncondensing |
| Elevation | -50 to 10,000 ft (-16 to 3,048 m) |
| 1 - See Table 2 for system behavior at high ambient temperatures. 2 - The allowable relative humidity level is 20 to 80% noncondensing. However, the recommended operating environment range is 40 to 55%. To minimize the risk of hardware corrosion and degradation, we recommend lower temperatures and humidity for data centers with gaseous contamination such as high sulfur content. In general, the humidity fluctuations within the data center should be minimized. We also recommend that the data center be positively pressured and have air curtains on entry ways to prevent outside air contaminants and humidity from entering the facility. For facilities below 40% relative humidity, we recommend grounding straps when contacting the equipment to avoid the risk of electrostatic discharge (ESD), which can harm electronic equipment. | |
NOTE: For systems mounted in a cabinet, the operating limits listed above must not be exceeded inside the closed cabinet. Equipment mounted directly above or below an enclosure must not restrict the front-to-rear airflow of the storage system. Cabinet doors must not impede the front-to-rear airflow. The cabinet must exhaust air at a rate that is equal to or greater than the sum of the exhaust rates of all the equipment mounted in the cabinet.
| Ambient temperature | Hardware fault | Consequence |
|---|---|---|
| Above 62° C (143° F) | None | System shuts down |
| 52° C (125° F) | None | System cache disabled |
| 50° C (122° F) | Single fan fault | System shuts down |
| Any | Multiple fan faults | System shuts down after five minute timer expires for destaging cache |
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