Trying to figure out usable space on erasure coded pools

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Hi,

It's easy to calculate the amount of "raw" storage vs "actual" storage on replicated pools.
Example with 4x 2TB disks:
- 8TB "raw"
- 4TB "usable" (when using 2 replicas)

I understand how erasure coded pools reduces the overhead of storage required for data redundancy and resiliency and how it depends on the erasure coding profile you use.

Do you guys have an easy way to figure out the amount of usable storage ?

Thanks !
--
David Moreau Simard



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