Scaling Namespaces and Optimizing Data Storage
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Limitations of erasure coding

Erasure coding works only on new data written to a directory. Files already existing in the directory configured for erasure coding continue using the default 3x replication scheme. In addition, erasure coding might impact the performance of a cluster because of consuming considerable CPU resources and network bandwidth.

Given the current limitations, it is recommended that you use erasure coding only for cold data.