Erasure coding write hole closure for solid-state drive (SSD) erasure coding

At least one non-transitory computer-readable medium having stored thereon instructions which, when executed, cause a computing device to perform operations comprising:

• receiving, by a controller having control circuitry to control local access to one or more storage drives supporting erasure coding (EC) of a computing system, a write command indicating an address and first data;
• allocating an intermediate parity data buffer in a non-volatile memory (NVM) of a first storage driver of the one or more storage devices;
• issuing one or more commands to the first storage drive to
• read second data from the address on the first storage drive,
• determine first intermediate parity data representing a combination of the first data and the second data,
• write the first intermediate data to the intermediate parity data buffer according to a first index,
• atomically write the new data to the first storage device at the address and store the first index in the NVM of the first storage drive, and
• store the first intermediate parity data in a memory;
• reading the first intermediate parity data from the memory;
• and
• issuing one or more of the commands to a second storage drive of the one or more storage drives to
• read third data from the address on the second storage drive,
• determine second intermediate parity data by multiplying the third data by a Galois field coefficient of the second storage drive to generate a result and combining the result with the first intermediate parity data, and
• write the second intermediate data to the intermediate parity data buffer according to a second index,
• atomically write the third data to the second storage device at the address and
• store the second index in the NVM of the second storage drive, and store the second intermediate parity data in a memory.

An apparatus comprising:

• one or more storage drives supporting erasure coding (EC);
• and
• a controller having control circuitry to control local access to the one or more storage drives, and in response to a write command, the write command indicating an address and first data, the control circuitry is configured to:
• allocate an intermediate parity data buffer in a non-volatile memory (NVM) of a first storage driver of the one or more storage devices;
• issue one or more commands to the first storage drive to
• read second data from the address on the first storage drive,
• determine first intermediate parity data representing a combination of the first data and the second data,
• write the first intermediate data to the intermediate parity data buffer according to a first index,
• atomically write the new data to the first storage device at the address and store the first index in the NVM of the first storage drive, and
• store the first intermediate parity data in a memory;
• read the first intermediate parity data from the memory;
• and
• issue one or more of the commands to a second storage drive of the one or more storage drives to
• read third data from the address on the second storage drive,
• determine second intermediate parity data by multiplying the third data by a Galois field coefficient of the second storage drive to generate a result and combining the result with the first intermediate parity data, and
• write the second intermediate data to the intermediate parity data buffer according to a second index,
• atomically write the third data to the second storage device at the address and store the second index in the NVM of the second storage drive, and
• store the second intermediate parity data in a memory.