From time to time, they try to increase the storage volume with small disk capacities - but so that the number of disks is larger.
For example, 22 disks by 8 TB in RAID 6 instead of 10 to 20TB in RAID 6 - here and there the useful capacity of the array is 160TB.
Apparently, it is fueled by memories from the days of productivity random access on HDD arrays reached by the number of spindles.
Now HDD used exclusively for streaming data. It makes no sense to fill the storage body with small containers.
About money :
- 10 drives of 20TB cost much less than 22 of 8TB
- The design solution for 22 (24) discs is more expensive than the platform for 10 (12) HDD - 4U against 2U
- 22 drives require a more powerful power supply unit and consume twice as much electricity.
- Cooling is also more difficult and expensive
About expediency :
- Typical linear read-write speed from surfaces HDD – 150-250 MB/s
- Usually, data comes to the storage server from the network, usually via gigabit ethernet. Stream from one (!) the disk is already filling up the whole strip Theoretical flow of 10 discs will resist the network limitation of 10GB. So why that amount? HDD?
- And there are limitations RAID controllers, buses PCIe
- By the way, linear speed read/write orost in more capacious disks better Compare
20 TB
8 TB
So, there is no point in trifling. It is necessary to gain volume - take large containers HDD .
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