CA2546242A1 - Semi-static distribution technique - Google Patents
Semi-static distribution technique Download PDFInfo
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- CA2546242A1 CA2546242A1 CA002546242A CA2546242A CA2546242A1 CA 2546242 A1 CA2546242 A1 CA 2546242A1 CA 002546242 A CA002546242 A CA 002546242A CA 2546242 A CA2546242 A CA 2546242A CA 2546242 A1 CA2546242 A1 CA 2546242A1
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- Prior art keywords
- parity
- disk
- blocks
- array
- disks
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1076—Parity data used in redundant arrays of independent storages, e.g. in RAID systems
- G06F11/1096—Parity calculation or recalculation after configuration or reconfiguration of the system
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
Abstract
A semi-static distribution technique distributes parity across disks of an array. According to the technique, parity is distributed (assigned) across the disks of the array in a manner that maintains a fixed pattern of parity blocks among the stripes of the disks. When one or more disks are added to the array, the semi-static technique redistributes parity in a way that does not require recalculation of parity or moving of any data blocks. Notably, the parity information is not actually moved; the technique merely involves a change in the assignment (or reservation) for some of the parity blocks of each pre-existing disk to the newly added disk.
Claims (21)
1. A method for distributing parity across a disk array, the method comprising the steps of:
adding a new disk to pre-existing disks of the array;
dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and distributing parity among blocks of the new and pre-existing disks without re-calculation or moving of any blocks containing data.
adding a new disk to pre-existing disks of the array;
dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and distributing parity among blocks of the new and pre-existing disks without re-calculation or moving of any blocks containing data.
2. The method of Claim 1 wherein the step of distributing comprises the step of dis-tributing parity among blocks of the new and pre-existing disks in a manner that main-tains a fixed pattern of parity blocks among stripes of the disks.
3. The method of Claim 1 wherein the step of distributing comprises the step of chang-ing an assignment for one or more blocks containing parity of each pre-existing disk to the newly added disk.
4. The method of Claim 2 wherein the step of adding comprises the step of initializing the added disk so as to not affect parity of the stripes.
5. The method of Claim 4 wherein the step of initializing comprises the step of reas-signing blocks containing parity in certain stripes to the new disk without calculation or writing of parity.
6. The method of Claim 5 wherein the certain stripes comprise 1/N of the stripes, where N is equal to the number of disks in the array.
7. The method of Claim 5 wherein the step of reassigning comprises the step of chang-ing a block containing parity (parity block) to a block containing data (data block) and not changing a data block to a parity block.
8. The method of Claim 1 wherein the step of distributing comprises the step of reas-signing one of N blocks containing parity (parity blocks) from each pre-existing disk to the added disk, wherein N is equal to the number of disks in the array.
9. The method of Claim 8 wherein the step of reassigning comprises the step of reas-signing one of N parity blocks to the new disk, with each pre-existing disk continuing to hold 1/N of the parity blocks in the array.
10. A system adapted to distribute parity across disks of a storage system, the system comprising:
a disk array comprising pre-existing disks and at least one new disk; and a storage module configured to compute parity in blocks of stripes across the disks and reconstruct blocks of disks lost as a result of failure, the storage module fur-ther configured to assign the parity among the blocks of the new and pre-existing disks without recalculation or moving of any data blocks.
a disk array comprising pre-existing disks and at least one new disk; and a storage module configured to compute parity in blocks of stripes across the disks and reconstruct blocks of disks lost as a result of failure, the storage module fur-ther configured to assign the parity among the blocks of the new and pre-existing disks without recalculation or moving of any data blocks.
11. The system of Claim 10 further comprising a table configured to store parity as-signments calculated for one of a known group size of the disk array and a maximum group size of the array, the stored parity assignments defining a repeat interval of a par-ity distribution pattern used to determine locations of parity storage on any disk in the array.
12. The system of Claim 10 wherein the storage module is embodied as a RAID
sys-tem of the storage system.
sys-tem of the storage system.
13. The system of Claim 10 wherein the storage module is embodied as an internal disk array controller of the storage system.
14. The system of Claim 10 wherein the storage module is embodied as a disk array control system externally coupled to the storage system.
15. The system of Claim 10 wherein the disk array is a block-based RAID array.
16. A method for distributing commodities over containers of a system, the method comprising the steps of:
adding a new container to pre-existing containers of the system to thereby pro-vide N containers; and moving only 1/N of the commodities to the new container.
adding a new container to pre-existing containers of the system to thereby pro-vide N containers; and moving only 1/N of the commodities to the new container.
17. The method of Claim 16 wherein the system is a storage system, the commodities are data structures adapted for storage on storage devices of an array, and the containers are storage entities coupled to the array.
18. The method of Claim 17 wherein the storage entities are storage heads.
19. The method of Claim 17 wherein the data structures are mode file blocks.
20. Apparatus for distributing parity across a disk array, the apparatus comprising:
means for adding a new disk to pre-existing disks of the array;
means for dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and means for distributing parity among blocks of the new and pre-existing disks without recalculation or moving of any blocks containing data.
means for adding a new disk to pre-existing disks of the array;
means for dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and means for distributing parity among blocks of the new and pre-existing disks without recalculation or moving of any blocks containing data.
21. A computer readable medium containing executable program instructions for dis-tributing parity across a disk array, the executable instructions comprising one or more program instructions for:
adding a new disk to pre-existing disks of the array;
dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and distributing parity among blocks of the new and pre-existing disks without re-calculation or moving of any blocks containing data.
adding a new disk to pre-existing disks of the array;
dividing each disk into blocks, the blocks being organized into stripes such that each stripe contains one block from each disk; and distributing parity among blocks of the new and pre-existing disks without re-calculation or moving of any blocks containing data.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/720,364 | 2003-11-24 | ||
US10/720,364 US7185144B2 (en) | 2003-11-24 | 2003-11-24 | Semi-static distribution technique |
PCT/US2004/039618 WO2005052784A2 (en) | 2003-11-24 | 2004-11-24 | Semi-static parity distribution technique |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2546242A1 true CA2546242A1 (en) | 2005-06-09 |
CA2546242C CA2546242C (en) | 2011-07-26 |
Family
ID=34591531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2546242A Expired - Fee Related CA2546242C (en) | 2003-11-24 | 2004-11-24 | Semi-static distribution technique |
Country Status (9)
Country | Link |
---|---|
US (2) | US7185144B2 (en) |
EP (1) | EP1687707B1 (en) |
JP (1) | JP2007516524A (en) |
KR (1) | KR101148697B1 (en) |
CN (1) | CN101023412B (en) |
AU (1) | AU2004294208B2 (en) |
CA (1) | CA2546242C (en) |
IL (1) | IL175829A (en) |
WO (1) | WO2005052784A2 (en) |
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2004
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US20050114594A1 (en) | 2005-05-26 |
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CN101023412A (en) | 2007-08-22 |
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WO2005052784A2 (en) | 2005-06-09 |
KR20060120143A (en) | 2006-11-24 |
EP1687707B1 (en) | 2012-08-22 |
CN101023412B (en) | 2012-10-31 |
US7185144B2 (en) | 2007-02-27 |
US20070083710A1 (en) | 2007-04-12 |
AU2004294208B2 (en) | 2009-06-11 |
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