Disk array system and rebuild method thereof
First Claim
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1. A disk array system comprising:
- a plurality of disk drives constituting a disk array;
a RAID module for performing a normal read/write access to the disk array;
a backup storage device;
a backup module for reading data from said disk array and writing the read data onto said backup storage device;
a replacement disk drive for replacing one of the plurality of disk drives after one of the plurality of disk drives fails;
a rebuild module for performing rebuilding of data on the replacement disk drive based on the data backed up in said backup storage device; and
means for rebuilding data on the replacement disk drive from the backup storage device through the rebuild module while simultaneously providing normal read/write access to the disk drives that have not failed through the RAID module.
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Abstract
Disclosed is a disk array system which includes a plurality of disks constituting a disk array and a backup storage for backing up data in the disk array and performs control so that when a failed disk among the disks constituting the disk array is replaced with the replacement disk, restoration of data in the replacement disk is performed using the backup device.
63 Citations
22 Claims
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1. A disk array system comprising:
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a plurality of disk drives constituting a disk array; a RAID module for performing a normal read/write access to the disk array; a backup storage device; a backup module for reading data from said disk array and writing the read data onto said backup storage device; a replacement disk drive for replacing one of the plurality of disk drives after one of the plurality of disk drives fails; a rebuild module for performing rebuilding of data on the replacement disk drive based on the data backed up in said backup storage device; and means for rebuilding data on the replacement disk drive from the backup storage device through the rebuild module while simultaneously providing normal read/write access to the disk drives that have not failed through the RAID module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of rebuilding a disk array system, said method comprising:
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backing up data in a disk array including a plurality of disk drives onto a backup storage device; and when a failed disk drive among said disk drives constituting said disk array is replaced with a replacement disk drive, rebuilding data in said replacement disk drive from the backed-up data in the backup storage device while simultaneously providing other devices with access to the disk drives that have not failed. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification