1. A method for storing data in a computer network, comprising: determining a size of a parity group in response to a write request, said size describing a number of data blocks in said parity group; arranging at least a portion of data from said write request according to said data blocks; computing a parity block for said parity group; storing each of said data blocks on a separate disk drive such that no two data blocks from said parity group reside on the same disk drive; storing said parity block on a separate disk drive that does not contain any of said data blocks; and redistributing said parity group to improve storage efficiency.