Aspects of the present disclosure configure a memory sub-system to track error-correction parity calculations in the memory sub-system. For example, a memory sub-system controller of the memory sub-system can generate and use a first data structure to map one or more data chunks of an open data block to one or more buffers in a set of buffers for temporary storage of partial parity calculation results for the one or more data chunks, and generate and use a second data structure to map one or more data chunks of an open data block to one or more memory locations on non-volatile memory space (implemented by a set of memory components) for persistent storage of partial panty calculation results for the one or more data chunks.