Redundant array of disks with improved storage and recovery spee

Details Redundant array of disks with improved storage and recovery spee Redundant array of disks with improved storage and recovery spee

1993-08-23

1996-05-14

Robertson, David L.

39549702, 39549704, G06F 1202

Patent

active

055176321

ABSTRACT:
In a redundant array of disks, the disks are divided into areas of different sizes, so that small amounts of data can be stored in an area of an appropriate size on a single disk, instead of being spread over multiple disks. A usage status table indicates which areas are in use. Check information is generated and stored only for areas indicated to be in use. When new check information is generated, it is therefore possible to omit the reading of unnecessary old data and old check information.

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Patterson, et al "A Case for Redundant Arrays of Inexpensive Disks" Computer Science Div. U of Cal, Berkley Dec. 1987.
IBM Technical Disclosure Bulletin "Use of Non-Volatile Semiconductor Storage for Disk Array Parity".

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