MAXIMIZING REDUNDANT INFORMATION IN A MIRRORED VAULT
A method for execution by one or more processing modules of computing devices of a dispersed storage network (DSN), the method begins by dispersed storage error encoding data for storage utilizing a first encoding matrix to produce a first plurality of sets of encoded data slices. The method continues when the data is to be mirror stored, by dispersed storage error encoding the data for storage utilizing a second encoding matrix to produce extension slices of a second plurality of sets of encoded data slices, sending, via a network, the first plurality of encoded data slices to a first set of storage units, sending, via the network, the second plurality of encoded data slices to a second set of storage units and retrieving at least a decode threshold number of encoded data slices from one or more of the sets of storage units to enable recovery of the data.
1 . A method for execution by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), the method comprises:
dispersed storage error encoding data for storage utilizing a first encoding matrix to produce a first plurality of sets of encoded data slices;
when the data is to be mirror stored, dispersed storage error encoding the data for storage utilizing a second encoding matrix to produce extension encoded data slices of a second plurality of sets of encoded data slices;
sending, via a network, the first plurality of sets of encoded data slices to a first set of storage units;
sending, via the network, the second plurality of sets of encoded data slices to a second set of storage units; and
when retrieving the data, retrieving at least a decode threshold number of encoded data slices from one or more of the first or second sets of storage units to enable recovery of the data.
2 . The method of claim 1 , wherein the dispersed storage error encoding utilizing a first encoding matrix includes: dividing the data into a plurality of data segments, and for each data segment, dispersed storage error encoding the data segment utilizing an encoding matrix A to produce a set of encoded data slices.
3 . The method of claim 2 , wherein the dispersed storage error encoding utilizing a second encoding matrix includes: for each data segment, dispersed storage error encoding the data segment utilizing an encoding matrix B to produce corresponding extension encoded data slices.
4 . The method of claim 1 , wherein each set of encoded data slices of the first plurality of sets of encoded slices includes a first information dispersal algorithm (IDA) width number of encoded data slices.
5 . The method of claim 4 , wherein each set of encoded data slices of the second plurality of sets of encoded slices includes a second IDA width number of encoded data slices, and where the second IDA width number is equal to, smaller than or larger than the first IDA width number.
6 . The method of claim 1 , wherein sending includes identifying one of the first or second sets of storage units and issuing write slice requests.
7 . The method of claim 1 further comprises dispersed storage error encoding N additional sets of encoded data slices as additional mirrored vaults.
8 . A computing device of a group of computing devices of a dispersed storage network (DSN), the computing device comprises:
an interface;
a local memory; and
a processing module operably coupled to the interface and the local memory, wherein the processing module functions to:
disperse storage error encode data for storage utilizing an encoding matrix to produce a first plurality of sets of encoded data slices;
when the data is to be mirror stored, disperse storage error encoding the data for storage utilizing a second encoding matrix to produce extension encoded data slices of a second plurality of sets of encoded data slices;
send, via a network, the first plurality of sets encoded data slices to a first set of storage units;
send, via the network, the second plurality of sets of encoded data slices to a second set of storage units; and
when retrieving the data, for each set, recover at least a decode threshold number of encoded data slices of either of the first or second plurality of sets of encoded data slices.
9 . The computing device of claim 8 , wherein the dispersed storage error encoding utilizing a first encoding matrix includes: dividing the data into a plurality of data segments, and for each data segment, dispersed storage error encoding the data segment utilizing an encoding matrix A to produce a set of encoded data slices.
10 . The computing device of claim 9 , wherein the dispersed storage error encoding utilizing a second encoding matrix includes: for each data segment, dispersed storage error encoding the data segment utilizing an encoding matrix B to produce corresponding extension encoded data slices.
11 . The computing device of claim 8 , wherein each set of encoded data slices of the first plurality of sets of encoded slices includes a first information dispersal algorithm (IDA) width number of encoded data slices.
12 . The computing device of claim 11 , wherein each set of encoded data slices of the second plurality of sets of encoded slices includes a second IDA width number of encoded data slices, and where the second IDA width number is equal to, smaller than or larger than the first IDA width number.
13 . The computing device of claim 8 , wherein sending includes identifying one of the first or second sets of storage units and issuing write slice requests.
14 . The computing device of claim 8 further comprises dispersed storage error encoding N additional sets of encoded data slices as additional mirrored vaults.
15 . A method for execution by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), the method comprises:
dispersed storage error encoding data for storage utilizing an encoding matrix to produce a first plurality of sets of encoded data slices;
when the data is to be mirror stored, dispersed storage error encoding the data utilizing an extension encoding matrix to produce a plurality of groups of extension encoded data slices;
sending, via a network, the first plurality of sets of encoded data slices to a first set of storage units;
sending, via the network, the second plurality of sets of encoded data slices to a second set of storage units; and
when retrieving the data, for each set, recovering at least a decode threshold number of encoded data slices of either of the first or second plurality of sets of encoded data slices.
16 . The method of claim 15 , wherein each set of encoded data slices of the first plurality of sets of encoded slices includes a first information dispersal algorithm (IDA) width number of encoded data slices.
17 . The method of claim 16 , wherein each set of encoded data slices of the second plurality of sets of encoded slices includes a second IDA width number of encoded data slices, and where the second IDA width number is equal to, smaller than or larger than the first IDA width number.
18 . The method of claim 15 , wherein sending includes identifying one of the first or second sets of storage units and issuing write slice requests.
19 . The method of claim 15 further comprises dispersed storage error encoding N additional sets of encoded data slices as additional mirrored vaults.
20 . The method of claim 15 , wherein recovering includes: obtaining a decode threshold number of encoded data slices for each set of encoded data slices partially from both of the first and second storage sets.