Recovering affinity with imposter slices
First Claim
1. A method of accessing data in a dispersed storage network, the dispersed storage network including a plurality of primary dispersed storage units and a plurality of secondary dispersed storage units, the method comprising:
- dispersed storage error encoding a data segment to produce a set of encoded data slices;
for each available primary dispersed storage unit of the plurality of primary dispersed storage units, sending a respective write slice request for receipt by a respective available primary dispersed storage unit, the respective write slice request including a respective slice name corresponding to the respective available primary dispersed storage unit and a respective encoded data slice of the set of encoded data slices, wherein the respective encoded data slice includes a first respective information dispersed algorithm index of the respective available primary dispersed storage unit; and
for each unavailable primary dispersed storage unit of the plurality of primary dispersed storage units, sending a respective write imposter slice request for receipt by a respective secondary dispersed storage unit of the plurality of secondary dispersed storage units, the respective write imposter slice request including a respective imposter slice name corresponding to the respective secondary dispersed storage unit and a respective imposter encoded data slice of the set of encoded data slices, wherein the respective imposter encoded data slice includes a second respective information dispersed algorithm index of the respective unavailable primary dispersed storage unit.
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Accused Products
Abstract
Methods and apparatus for accessing dispersed storage error encoded data in a dispersed storage network (DSN). For each available primary storage unit, a processing module issues a write slice request including a slice name and encoded data slice corresponding to the primary storage unit where the encoded data slice includes an information dispersal algorithm (IDA) index of the primary storage unit. For each unavailable primary storage unit, the processing module issues a write imposter slice request to a foster storage unit that includes a slice name corresponding to foster storage unit and an imposter encoded data slice corresponding to the unavailable primary storage unit, where the imposter encoded data slice includes an IDA index corresponding to the unavailable primary storage unit. When the unavailable primary storage unit becomes available, the processing module facilitates transfer of the imposter encoded data slice to the newly available primary storage unit.
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Citations
20 Claims
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1. A method of accessing data in a dispersed storage network, the dispersed storage network including a plurality of primary dispersed storage units and a plurality of secondary dispersed storage units, the method comprising:
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dispersed storage error encoding a data segment to produce a set of encoded data slices; for each available primary dispersed storage unit of the plurality of primary dispersed storage units, sending a respective write slice request for receipt by a respective available primary dispersed storage unit, the respective write slice request including a respective slice name corresponding to the respective available primary dispersed storage unit and a respective encoded data slice of the set of encoded data slices, wherein the respective encoded data slice includes a first respective information dispersed algorithm index of the respective available primary dispersed storage unit; and for each unavailable primary dispersed storage unit of the plurality of primary dispersed storage units, sending a respective write imposter slice request for receipt by a respective secondary dispersed storage unit of the plurality of secondary dispersed storage units, the respective write imposter slice request including a respective imposter slice name corresponding to the respective secondary dispersed storage unit and a respective imposter encoded data slice of the set of encoded data slices, wherein the respective imposter encoded data slice includes a second respective information dispersed algorithm index of the respective unavailable primary dispersed storage unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A dispersed storage processing unit for use in a dispersed storage network, the dispersed storage network including a plurality of primary dispersed storage units and a plurality of secondary dispersed storage units, the first dispersed storage processing unit comprising:
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a communications interface; a memory; and a processor; wherein the memory includes a data segment and wherein the memory further includes instructions for causing the processor to; dispersed storage error encode a data segment to produce a set of encoded data slices; for each available primary dispersed storage unit of the plurality of primary dispersed storage units, send a respective write slice request for receipt by a respective available primary dispersed storage unit, the respective write slice request including a respective slice name corresponding to the respective available primary dispersed storage unit and a respective encoded data slice of the set of encoded data slices, wherein the respective encoded data slice includes a respective information dispersed algorithm index of the respective available primary dispersed storage unit; and for each unavailable primary dispersed storage unit of the plurality of primary dispersed storage units, send a respective write imposter slice request for receipt by a respective secondary dispersed storage unit of the plurality of secondary dispersed storage units, the respective write imposter slice request including a respective imposter slice name corresponding to the respective secondary dispersed storage unit and a respective imposter encoded data slice of the set of encoded data slices, wherein the respective imposter encoded data slice includes a respective information dispersed algorithm index of the respective unavailable primary dispersed storage unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A dispersed storage network comprising:
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a plurality of primary dispersed storage units; a plurality of secondary dispersed storage units; and a dispersed storage processing unit, the dispersed storage processing unit including; a communications interface; a memory; and a processor; wherein the memory includes a data segment and wherein the memory further includes instructions for causing the processor to; dispersed storage error encode a data segment to produce a set of encoded data slices; for each available primary dispersed storage unit of the plurality of primary dispersed storage units, send a respective write slice request to a respective available primary dispersed storage unit, the respective write slice request including a respective slice name corresponding to the respective available primary dispersed storage unit and a respective encoded data slice of the set of encoded data slices, wherein the respective encoded data slice includes a respective information dispersed algorithm index of the respective available primary dispersed storage unit; and for each unavailable primary dispersed storage unit of the plurality of primary dispersed storage units, send a respective write imposter slice request to a respective secondary dispersed storage unit of the plurality of secondary dispersed storage units, the respective write imposter slice request including a respective imposter slice name corresponding to the respective secondary dispersed storage unit and a respective imposter encoded data slice of the set of encoded data slices, wherein the respective imposter encoded data slice includes a respective information dispersed algorithm index of the respective unavailable primary dispersed storage unit. - View Dependent Claims (20)
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Specification