Apparatus and Method for Parity Resynchronization in Disk Arrays

A method for parity resynchronization in disk arrays, comprising:

• generating an intent log comprising a list of addresses of pieces of data stored in a data write cache;
• writing the pieces of data of the data write cache to a disk while withdrawing the data from the data write cache;
• and
• when supply of power is interrupted during writing of the data to the disk, a processor supplying power to the disk to resume an operation of the disk, checking whether parity mismatch has occurred on the data of the disk corresponding to the data address list stored in the intent log, and correcting a parity mismatch block using a parity block.

An apparatus for parity resynchronization in disk arrays, comprising:

• a disk array comprising a plurality of disks and a plurality of stripes;
• a data write cache for storing pieces of data to be written to the disks;
• a buffering write cache for buffering write-requested data;
• an intent log comprising addresses of the pieces of data stored in the data write cache;
• and
• a processor for determining whether parity mismatch has occurred on the pieces of data corresponding to the data addresses stored in the intent log, and correcting an erroneous block corresponding to data on which it is determined that parity mismatch has occurred,
• wherein the processor determines whether parity mismatch has occurred on the disk array or corrects the erroneous block using normal blocks and a parity block.

A method for parity resynchronization in disk arrays, comprising:

• generating an intent log comprising addresses of pieces of data stored in a data write cache;
• writing the pieces of data of the data write cache to a disk while withdrawing the data from the data write cache, and buffering write-requested data provided by a user in a buffering write cache;
• and
• when supply of power is interrupted while writing the pieces of data of the data write cache to the disk, a processor supplying power to the disk to resume an operation of the disk, checking whether parity mismatch has occurred on the data of the disk corresponding to the data address list stored in the intent log, and correcting a parity mismatch block using a parity block.