Resource Units Calculation

Table of Contents


Calculation from resource units to CU/SU for farming purposes

The threefold Zero-OS and TFChain software translates resource units (CRU, MRU, HRU, SRU) into cloud units (CU, SU) for farming reward purposes.

Compute

For farming, 1 CU equals:

  • 2 virtual CPUs with a maximum over subscription of 4 CPUs and minimum required memory of 4GB.
  • An over subscription of 4 CPUs remains still gentle as we understand many other providers use more.
  • There needs to be at least 50GB SSD per CU, if not there is penalty for nr of CU, reasoning is that otherwise people cannot deploy their VM's or Containers if there would not be minimal SSD.
cu = min((mru - 1) / 4, cru * 4 / 2, sru / 50)
  • 1 GB of memory is subtracted for the operating system to function.
  • please note minimal passmark per CU (with 4GB mem), needs to be 1000 passmark at farming side, this is not being checked today but might be done in future. If your chosen CPU has less than 1000 passmark per CU (of 4 GB mem), it could be your final CU's will be lower once that feature is introduced.

Storage

For farming, 1 SU equals to:

  • 1.2 TB of HD capacity (which can deliver 1 TB of net usable storage)
  • 200 GB of SSD capacity with a buffer of 20%
su = hru / 1200 + sru * 0.8 / 200

Storage cost price verification Dec 2021

  • price for 16 TB HDD = 300 USD
    • 16000 / 1200 = 13.3 SU
    • 1 SU costs = 300 / 13.3 = 22.5 for HDD
  • price for 2 TB SSD = 200 USD
    • 2000 * 0.8 / 200 = 8 SU
    • 1 SU costs 200 / 8 = 25 for SSD