Heat Dissipation and Noise
A storage system can run steadily using the heat dissipation system carried in its own fan modules. An external device is necessary to remove the hot air discharged from a storage system into the equipment room to ensure proper air circulation.
Heat Dissipation
Heat dissipation modes are as follows:
- 2 U controller enclosure (air exhausted from front and rear ends to the rear end)
Cooling air enters from the fan holes and gaps of disk modules and interface modules. After dissipating the heat of interface modules, controllers, and power modules, the air is discharged out of power modules' fan holes. The controller enclosure dynamically adjusts rotational speed of the fans based on the operational temperature of the storage system.
- 3 U or 6 U controller enclosure (air exhausted from the front end to the rear end)
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 (air exhausted from the front end to the rear end)
- For a 2 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 power modules' fan holes 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 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 (39.4 inches) away from the equipment room walls and at least 120 cm (47.24 inches) 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 or 1.75 inches) space should be left above and below each device.
The airflow parameters of the storage system are listed in Table 7-7.
System Airflow |
5300 V3 |
5500 V3 |
5600 V3 |
5800 V3 |
6800 V3 |
|---|---|---|---|---|---|
Controller enclosure |
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2 U disk enclosure |
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4 U disk enclosure |
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4 U high-density disk enclosure |
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a: cubic feet per minute (CFM) |
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The heat dissipation parameters of the storage system are listed in Table 7-8.
Maximum Heat Dissipation (in running) |
5300 V3 |
5500 V3 |
5600 V3 |
5800 V3 |
6800 V3 |
|---|---|---|---|---|---|
Controller enclosure |
1904.24 BTUa/h |
2640.55 BTUa/h |
3045.55 BTU/h |
3833.72 BTU/h |
|
2 U disk enclosure |
1100.37 BTU/h |
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4 U disk enclosure |
1985.78 BTU/h |
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4 U high-density disk enclosure |
4265.00 BTU/h |
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a: British thermal unit (BTU) |
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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.
When the temperature is 25°C, the parameters of the noise generated by the storage system are listed in Table 7-9.
