Erasure Coding

When the encoding function is called, it returns chunks of the same size. Data chunks which can be concatenated to reconstruct the original object and coding chunks which can be used to rebuild a lost chunk.

The number of data chunks, i.e. the number of chunks in which the original object is divided. For instance if K = 2 a 10KB object will be divided into K objects of 5KB each.

The number of coding chunks, i.e. the number of additional chunks computed by the encoding functions. If there are 2 coding chunks, it means 2 OSDs can be out without losing data.