Although some mid-range Storage Arrays have custom ASICs they are usually build from commodity enterprise components. The real know-how and differentiators are in storage array software (aka firmware, operating system). Thanks to simple hardware architecture we can relatively easily calculate power consumption of storage array,
Storage controllers are usually rack-mount servers consuming around 200W each.
Typical mid-range storage array has two controllers but some arrays can have even more controllers. Below storage controllers are disk enclosures. Disk Enclosures typically consumes 150-200W. Disk enclosures are populated with disks. Below are typical power consumptions of modern disks.
Storage controllers are usually rack-mount servers consuming around 200W each.
Typical mid-range storage array has two controllers but some arrays can have even more controllers. Below storage controllers are disk enclosures. Disk Enclosures typically consumes 150-200W. Disk enclosures are populated with disks. Below are typical power consumptions of modern disks.
| Disk | Idle | Transactional |
| 300GB 15K SFF HDD | 6.2W | 8W |
| 450GB 10K SFF HDD | 3.7W | 6.3W |
| 600GB 10K SFF HDD | 4.1W | 6.3W |
| 900GB 10K SFF HDD | 4.8W | 6.3W |
| 1TB 7.2K SFF HDD | 2.95W | 3.84W |
| 2TB 7.2K LFF HDD | 7.5W | 10.6W |
| 3TB 7.2K LFF HDD | 8.5W | 11.8W |
| 100GB SFF SLC SSD | 1.4W | 3.9W |
| 200GB SFF SLC SSD | 1.4W | 3.9W |
| 400GB SFF MLC SSD | 2.2W | 3.7W |
SFF = Small Form Factor; 2.5"
LFF = Large Form Factor; 3.5"
So here is example calculation for Storage Array HP 3PAR 7400 having two storage controllers and seven disk enclosures.
Storage Controllers = 2x 200W
Disk Enclosures = 7x 150W
And following disks: 8x 400GB MLC SSD, 128x 300GB 15K and 40x 900GB 10K = 8 x 3.7W + 128 x 8W + 40 x 6.3W = 29.6 + 1024 + 252 = 1,305.6W
Total power consumption of such storage system configuration is 2,755W = 2.76 kW.
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