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RAID system and rebuild/copy back processing method thereof

  • US 20070088976A1
  • Filed: 02/23/2006
  • Published: 04/19/2007
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
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1. A RAID system for accessing a connected disk device according to an I/O request requested from a host and executing the I/O request, comprising:

  • a plurality of the disk devices constituting the RAID; and

    a controller for executing Rebuild or Copy back processing for reconstructing a RAID configuration, when one of the plurality of disk devices fails, by executing in parts a plurality of times of operation to read data of a disk device, other than the failed disk device, and to write data to a spare disk device or a new disk device, wherein the controller judges whether a normal I/O request, including an I/O request from the host, does not arrive for a predetermined time, and when a normal I/O request does not arrive for a predetermined time, sets larger the request processing size for one time of Rebuild or Copy back processing, which is to be executed in parts for a plurality of times, compared with the size in the case when the normal I/O request arrives within the predetermined time.

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