Method and system for detection and reconstruction of corrupted data in a data storage subsystem

A method for detecting corrupted data in one of a plurality of hard disk drives (HDDs) in a data storage subsystem, a predetermined number of fixed blocks within each of the HDDs emulating a track of a first track format, the predetermined number of fixed blocks providing a logical track, the logical track of one of the plurality of HDDs being generated by the others of the plurality of HDDs, the plurality of logical tracks forming a plurality of track groups;

• the method comprising the steps of:
• a) determining each of the plurality of logical tracks is formatted in accordance with an expected first track format;
• b) comparing each of the formats of the plurality of logical tracks to the expected first track format until one of the logical tracks has an invalid format;
• c) determining if other logical tracks in a same track group have valid first track formats;
• and
• d) reconstructing the logical track if the other tracks within the same track group have valid first track formats.

A method for detecting corrupted data in one of a plurality of hard disk drives (HDDs) in a data storage subsystem, a predetermined number of fixed blocks within each of the HDDs emulating a track of a first track format, the predetermined number of fixed blocks providing a logical track, the logical track of one of the plurality of HDDs being generated by the others of the plurality of HDDs, the plurality of logical tracks forming a plurality of track groups;

• the method comprising the steps of:
• a) regenerating the one track from the other logical track;
• b) comparing the one track to the regenerated one track;
• c) determining which of the plurality of HDDs includes corrupted information if mismatch occurs;
• and
• d) reconstructing the information in the HDD which includes corrupted data.

A system for detecting corrupted data in one of a plurality of hard disk drives (HDDs) in a data storage subsystem, a predetermined number of fixed blocks within each of the HDDs emulating a track of a first track format, the predetermined number of fixed blocks providing a logical track, the logical track of one of the plurality of HDDs being generated by the others of the plurality of HDDs, the plurality of logical tracks forming a plurality of track groups;

• the system comprising:
• means for assigning each of the plurality of logical tracks an address translation (ADT) number;
• means for comparing each of the ADT numbers of the plurality of logical tracks to an expected value until a mismatch occurs in a logical track;
• means for determining if other logical tracks in a same track group have accurate ADT numbers;
• and
• means for reconstructing the logical track if the other tracks within the same track group have accurate ADT numbers.

A system for detecting corrupted data in one of a plurality of hard disk drives (HDDs) in a data storage subsystem, a predetermined number of fixed blocks within each of the HDDs emulating a track of a first track format, the predetermined number of fixed blocks providing a logical track, the logical track of one of the plurality of HDDs being generated by the others of the plurality of HDDs, the plurality of logical tracks forming a plurality of track groups;

• the system comprising:
• means for determining each of the plurality of logical tracks is formatted in accordance with an expected first track format;
• means for comparing each of the formats of the plurality of logical tracks to the expected first track format until one of the logical tracks has an invalid format;
• means for determining if other logical tracks in a same track group have valid first track formats;
• and
• means for reconstructing the logical track if the other tracks within the same track group have valid first track formats.

A system for detecting corrupted data in one of a plurality of hard disk drives (HDDs) in a data storage subsystem, a predetermined number of fixed blocks within each of the HDDs emulating a track of a first track format, the predetermined number of fixed blocks providing a logical track, the logical track of one of the plurality of HDDs being generated by the others of the plurality of HDDs, the plurality of logical tracks forming a plurality of track groups;

• the system comprising the steps of:
• means for regenerating the one track from the other logical track;
• means for comparing the one track to the regenerated one track;
• means for determining which of the plurality of HDDs includes corrupted information if mismatch occurs;
• and
• means for reconstructing the information in the HDD which includes corrupted data.