Methods and system for detecting data loss in a hierarchic data

Details Methods and system for detecting data loss in a hierarchic data Methods and system for detecting data loss in a hierarchic data

1994-10-05

1996-11-05

Beausoliel, Jr., Robert W.

G06F 1134

Patent

active

055726615

ABSTRACT:
Data loss is selectively tracked within a hierarchic data storage system having multiple storage disks that define a physical storage space. The physical storage space is mapped into a first virtual storage space which presents the physical storage space as multiple RAID areas that store data according to various RAID levels, such as RAID Level 1 (mirror redundancy) or RAID Level 5 (parity redundancy). Individual RAID areas extend across multiple storage disks and include a region of physical storage space on individual storage disks. The first virtual storage space is mapped into a second virtual storage space which presents the physical storage space as multiple virtual blocks. The RAID areas are monitored to detect data loss. Upon detecting data loss within a region of a RAID area, this first region is marked as invalid. Upon detecting data loss within a second region of the same RAID area, the data storage system will determine the extent of data loss. If the data loss is comparatively minor, the data storage system will identify the virtual block that is mapped onto the portion of the second region and mark it defective. The address of the virtual block is stored in a virtual data loss table to indicate that data stored in that block is unreliable. If the data loss in the second region is significant, or if the virtual data loss table becomes full, the data loss will cause the entire RAID area to be classified as "dead".

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RAIDBook: A Source Book For RAID Technology, published Jun. 9, 1993, by the RAID Advisory Board, Lino Lakes, Minn.

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