Chia Currency Has Already Used 1 Exabyte of Storage

Just when we thought that smart cities, smart factories, IoT devices, autonomous vehicles, and robots will be the main generators of data that will require storage space in the coming years, Chia Coin cryptocurrency just demonstrated that it will also be a formidable generator of data, at least for the time being. 

In a about a month's time storage space allocated to Chia network increased from 120PB all the way to 1143PB, or 1.14 Exabytes. 1.14EB equals 1,140,000TB, or 63,333 20TB hard drives. 

Chia is a proof of space-time cryptocurrency that uses storage space on farmers' systems to store a collection of cryptographic numbers called 'plots.' When the blockchain broadcasts a challenge for the next block, farmers' systems scan their plots to see if they have the hash that is closest to the challenge. This method eliminates the Proof of Work concept used by Bitcoin and Ethereum therefore lowering vast power requirements for mining, which developers of Chia call 'farming.'  

Meanwhile, the probability of winning a block is the percentage of the total space that a farmer has compared to the entire network, which essentially means that someone with more available space has more chances to win. So, while accelerators and GPUs are not needed for Chia farming, someone with more storage space to host more plots earns more.  

At present a minimum size plot requires around 101GB of storage space and 4GB of RAM, so when one wants to store 100 K32 plots, they need a system with slightly more than 10TB of space, which is not too expensive. Meanwhile, creation of each plot requires 4GB of DRAM, so creating 100 plots in parallel would require 400GB of system memory, which cost quite a sum, yet almost nobody does it.

One of the moderators of r/Chia at Reddit noted. "The RAM and storage space used to make the plots is reused to make new plots, so one only needs as much SSD space and RAM as needed to create the number of plots they want to create at one time, either singularly or in parallel," he said.

Thousands of Chia farmers now build machines with tens of HDDs that can store tens terabytes of data. While one of such drives does not consume a lot — about 6.5W when operating and about 5.6W when idling — tens of such HDDs can consume hundreds of Watts when they work and usually more when starting up. For example, a system with 32 Western Digital HC550 18TB HDDs (like the one pictured above) powered by a monster motherboard with 32 SATA ports can consume around 180W when idling, which does not count power consumption of memory and compute modules. 

For obvious reasons, there are no consumer PC chassis or NAS boxes with 32 3.5-inch bays. Meanwhile, rack-based chassis with backplanes for data centers are quite expensive. As a result, hardware used for Chia farming is either DIY or designed specifically for this purpose and nothing else. Essentially, in just about several months' time a new segment of hardware market for Chia farming has developed. 

One recommended way to save power and money is to use Raspberry Pi to farm Chia Coin after you've built the plots on a PC. 

It remains to be seen how Chia cryptocurrency mining will develop going forward. But at this rate the amount of storage space used by Chia network will be gargantuan a year from now.