Disk array subsystem including disk array with redundancy
OwnerSusumu Hirofuji, Masao Sakitaniinventors
Life of this patent
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Abstract
A disk array subsystem includes a disk array with redundancy, a spare disk drive and an array controller. The array controller causes a host to recognize the disk array as a first logical unit having a single storage area. When one of a plurality of disk drives that compose the disk array fails, the array controller replaces the failed disk drive with the spare disk drive. The array controller causes the host to recognize the failed disk drive as a second logical unit other than the first logical unit.
Claims16
A disk array subsystem that is accessible by a host, comprising:
- a disk array with redundancy, which is composed of a plurality of disk drives;
- a spare disk drive with which one of the disk drives is replaced when the one of the disk drives fails;
- and
- an array controller which controls the disk array, the array controller including:
- replacement means for replacing the failed disk drive with the spare disk drive;
- and
- management means for causing the host to recognize the disk array as a first logical unit having a single storage area and causing the host to recognize the failed disk drive as a second logical unit other than the first logical unit.
A method of controlling a disk array with redundancy, which is composed of a plurality of disk drives, the disk array being recognized as a first logical unit having a single storage area by a host, the method comprising:
- replacing one of the disk drives with a spare disk drive when the one of the disk drives fails;
- and
- causing the host to recognize the failed disk drive as a second logical unit other than the first logical unit.
A computer program product used to control a disk array with redundancy, which is composed of a plurality of disk drives, the disk array being recognized as a first logical unit having a single storage area by a host, the computer program product comprising:
- computer-readable program code means for causing a computer to replace one of the disk drives with a spare disk drive when the one of the disk drives fails;
- and
- computer-readable program code means for causing the computer to cause the host to recognize the failed disk drive as a second logical unit other than the first logical unit.
Dependencies are inferred from the claim text.