Erasure coded pool chunk count k

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Hello guys,
how does one estimate number of chunks for erasure coded pool ( k = ? ) ? I see that number of m chunks determines the pool’s resiliency, however I did not find clear guideline how to determine k.

Red Hat states that they support only the following combinations:

k=8, m=3
k=8, m=4
k=4, m=2

without any rationale behind them.
The table is taken from https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html/storage_strategies_guide/erasure_code_pools.

Thanks!

Regards,
Martin


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