Environment Parameters
Temperature, humidity, and altitude requirements must be met so that storage systems can correctly work or be properly preserved.
Heat Dissipation
Heat dissipation modes are as follows:
- Controller enclosure
Cooling air enters from the front-end fan holes and gaps of the controller enclosure. After dissipating the heat of interface modules, controllers, power modules, disks, and BBUs, the air is discharged out of rear-end fan holes and gaps. The controller enclosure dynamically adjusts rotational speed of the fans based on the operational temperature of the storage system.
- Disk enclosure
- For a 4 U SAS disk enclosure: Cooling air enters from the front-end fan holes and gaps of the disk enclosure. After dissipating the heat of power modules, disks, and expansion modules, the air is discharged out of the fan holes of power modules and fan modules in the rear end. The disk enclosure dynamically adjusts rotational speed of the fans based on the operational temperature of the storage system.
- For a high-density disk enclosure: Cooling air enters from the front-end fan holes and gaps of the disk enclosure. After dissipating the heat of power modules, disks, and expansion modules, the air is discharged out of rear-end fan holes and gaps. The disk enclosure dynamically adjusts rotational speed of the fans based on the operational temperature of the storage system.
For better maintenance, ventilation, and heat dissipation, pay attention to the following when installing the storage system in the cabinet:
- To ensure smooth ventilation, the cabinet should be at least 100 cm away from the equipment room walls and at least 120 cm away from other cabinets (that are in front of or behind).
- To keep air convection between the cabinet and the equipment room, no enclosed space is allowed in the cabinet. 1 U (44.45 mm) space should be left above and below each device.
Noise
The disks and fans make noise when in operation, with fans being the major noise source. The intensity of fan rotation is associated with the temperature. A higher temperature leads to greater rotational speed by the fans, which in return creates greater noise. Therefore, there is a direct correlation between the noise made by a storage system and the ambient temperature in the equipment room.
For details about a storage system's environmental requirements for system operating and data storage, see Specifications Query (https://support-it.huawei.com/spec/#/home).
Altitude
Parameter |
Condition |
Requirement |
|---|---|---|
Altitude |
Operating altitude of disks |
-305 m to +3048 m |
Non-operating altitude of disks |
-305 m to +12192 m |
|
NOTE:
The disk running is affected by the environment. Ensure that disks are used in the environment that meets environmental specifications. Otherwise, the disk failure rate may increase. |
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Disk Storage
Solid state disks (SSDs) and hard disk drives (HDDs for short, including NL-SAS and SAS disks) cannot be preserved long after being powered off.
- When the ambient temperature is lower than 40ºC and SSDs are powered off, SSDs where no data is stored can be preserved for a maximum of 12 months and SSDs where data has been stored can be preserved for a maximum of 3 months. If the maximum preservation time is exceeded, data loss or SSD failure may occur.
- When the wet-bulb temperature is lower than 30ºC, packed mechanical disks that are powered off and unpacked mechanical disks can be preserved for a maximum of six months. If the maximum preservation time is exceeded, data loss or disk failure may occur. The maximum preservation time is determined based on the disk preservation specifications provided by the mechanical disk vendor. For details about the specifications, see the manual provided by the vendor.