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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0873249 (1986-06-12) |
| 발명자 / 주소 |
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| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 319 인용 특허 : 0 |
A storage management mechanism distributes parity blocks corresponding to multiple data blocks substantially equally among a set of storage devices. N storage units in a set are divided into a multiple of equally sized address blocks, each containing a plurality of records. Blocks from each storage
A storage management mechanism distributes parity blocks corresponding to multiple data blocks substantially equally among a set of storage devices. N storage units in a set are divided into a multiple of equally sized address blocks, each containing a plurality of records. Blocks from each storage unit having the same address ranges form a stripe of blocks. Each stripe has a block on one storage device containing parity for the remaining blocks of the stripe. Further stripes also have parity blocks, which are distributed on different storage units. Parity updating activity associated with every change to a data record is therefore distributed over the different storage units, enhancing access characteristics of the set of storage devices. The parity updating activity also includes the use of an independent version number stored with each data record and corresponding version numbers stored with the parity record. Each time a data record is changed, its version number is incremented and the corresponding version number in the parity record is incremented with the parity record update.
A data protection mechanism for a computer system having multiple independently accessible storage devices which store blocks of data, the data protection mechanism comprising: generator means for generating parity blocks as a function of sets of data blocks, said data blocks in a set corresponding
A data protection mechanism for a computer system having multiple independently accessible storage devices which store blocks of data, the data protection mechanism comprising: generator means for generating parity blocks as a function of sets of data blocks, said data blocks in a set corresponding to one parity block being stored on different storage devices; storage management means for managing the storage of data blocks and parity blocks onto the storage devices; and spreading means coupled to the storage management means for identifying a storage device to the storage management means on which each parity block is to be stored such that no one storage device contains the parity blocks for all of the groups of data blocks.
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