System and method for data error recovery in a solid state subsystem

A method of recovering from a data access error in a solid-state storage subsystem, the method comprising:

• implementing a data redundancy configuration with a plurality of data stripes in a non-volatile memory array of the solid-state storage subsystem;
• temporarily storing, in a volatile memory of the solid-state storage subsystem, data to be written to the non-volatile memory array and parity data associated with said data to be written;
• detecting an occurrence of a data access error in one of the plurality of data stripes for which parity data has not been written to the non-volatile memory array;
• and
• in response to detecting the occurrence of a data access error, moving the parity data for said data stripe in which the data access error occurred from the volatile memory to the non-volatile memory array to make said parity data available for attempting to correct the data access error in advance of a scheduled write for the parity data, the scheduled write corresponding to a time when the data already written to the non-volatile memory for said data stripe reaches a pre-defined stripe size.

A solid-state storage subsystem comprising:

• a non-volatile memory array;
• a controller configured to implement a data redundancy configuration with a plurality of data stripes in the non-volatile memory array;
• and
• volatile memory for temporarily storing data to be written to the non-volatile memory array and parity data for one or more of the data stripes in the non-volatile memory array;
• wherein the controller is further configured to:
• detect an occurrence of a data access error in one of the plurality of data stripes for which parity data has not been written to the non-volatile memory array;
• and
• in response to detecting an occurrence of a data access error, move the parity data for the data stripe in which the data access error occurred from the volatile memory to the non-volatile memory array, in advance of a time when the data written to the non-volatile memory for the data stripe reaches a pre-defined stripe size, whereby the data access error can be corrected with the parity data.