Method for rearranging data in a disk array system when a new di

Details Method for rearranging data in a disk array system when a new di Method for rearranging data in a disk array system when a new di

1997-05-20

2000-03-07

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711170, 714 6, 714 7, G06F 1120

Patent

active

060353732

ABSTRACT:
In a disk array system, such as a RAID system, when disks are added thereto, this invention rearranges data without requiring a back-up of the stored data. When new data storage units are added into a RAID system in which each data storage unit is a row and an address range of the data storage unit is a column, a new striping rule dependant on the number of data storage units in the system, inclusive of newly added unit, is determined. Data are rearranged in the storage areas according to the new striping rule. In rearranging one row according to the new striping rule, the data involved in the transfer to one row from the other row, continues to be stored as a place holder block. Data that has been rearranged is accessed according to the new striping rule which data that has not been rearranged is accessed according to the old striping rule.

REFERENCES:
patent: 5502836 (1996-03-01), Hale et al.
patent: 5517632 (1996-05-01), Matsumoto et al.
patent: 5524204 (1996-06-01), Verdoorn, Jr.
patent: 5615352 (1997-03-01), Jacobson et al.
patent: 5758118 (1998-05-01), Choy et al.
patent: 5809224 (1998-09-01), Schultz et al.
Artecon (Storage Dimensions) Press Release, "Storage Dimensions Introduces SuperFlex 3000 with DGR", entirety (pp. 1-3), Apr. 2, 1996.

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