公开(公告)号：JPH07295763A

公开(公告)日：1995-11-10

申请号：JP10632494

申请日：1994-04-22

Applicant: IBM

Inventor： NIIJIMA HIDETO ,  MATSUO NOBUYUKI ,  SHIMADA MAYUMI

IPC: G06F3/06 ,  G06F11/10

Abstract: PURPOSE: To improve the rewrite speed of a disk array device (RAID). CONSTITUTION: Access to a data disk is made apparently once by dividing a disk to read old data and a disk to write new data and an external semiconductor storage device whose write performance is considerably improved is used for a parity disk to make two accesses within an access time of the data disk once complete. A data array dividing data into N sequentially in the unit of one or a plurality of sectors is stored in each sector of N-sets of magnetic disks and the parity is stored in a parity disk. In the disk array device as above, (N+1) sets of magnetic disk devices for data storage and the data array is stored in sectors of the N-sets of magnetic disk devices and sectors of one magnetic disk device are used for redundant sectors.