System for changing the parity structure of a raid array

摘要: Disclosed is a system for altering the structure of parity groups, e.g., RAID level or number storage devices included in array. A group consists set data blocks and blocks. The are stored at least two devices. first processing unit alters an Nth wherein N integer value greater than equal to zero. groups includes one group. second determines range including groups. After detecting failure while set, processes determined determine whose was being altered when failed.