US 2015/0317196 A1 · ADJUSTING A NUMBER OF DISPERSED STORAGE UNITS

Abstract

A method begins by a processing module of a dispersed storage network (DSN) determining that a set of storage units of the DSN will be substantially used for read operations of dispersed storage error encoded data. For the set of storage units, the method continues with the processing module determining an actual level of reliability in retrieving a decode threshold number of encoded data slices per read request of a plurality of read requests. The method continues with the processing module comparing the actual reliability to a desired level of reliability in retrieving the decode threshold number of encoded data slices per read request of the plurality of read requests. When the actual reliability exceeds the desired reliability by a reconfiguration threshold, the method continues with the processing module removing one or more storage units from the set of storage units.

Claims39

Dependent claims

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:

determining that a set of storage units of the DSN will be substantially used for read operations of dispersed storage error encoded data;
and
for the set of storage units:
determining an actual reliability that indicates a level of reliability in retrieving a decode threshold number of encoded data slices per read request of a plurality of read requests;
comparing the actual reliability to a desired reliability of the set of storage units, wherein the desired reliability indicates a desired level of reliability in retrieving the decode threshold number of encoded data slices per read request of the plurality of read requests;
and
when the actual reliability exceeds the desired reliability by a reconfiguration threshold, removing one or more storage units from the set of storage units.

4 more elements

A computer readable storage medium comprises:

at least one memory section that stores operational instructions that, when executed by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), causes the one or more computing devices to:
determine that a set of storage units of the DSN will be substantially used for read operations of dispersed storage error encoded data;
and
for the set of storage units:
determine an actual reliability that indicates a level of reliability in retrieving a decode threshold number of encoded data slices per read request of a plurality of read requests;
compare the actual reliability to a desired reliability of the set of storage units, wherein the desired reliability indicates a desired level of reliability in retrieving the decode threshold number of encoded data slices per read request of the plurality of read requests;
and
when the actual reliability exceeds the desired reliability by a reconfiguration threshold, remove one or more storage units from the set of storage units.

5 more elements

A computer readable storage medium comprises:

at least one memory section that stores operational instructions that, when executed by one or more processing modules of one or more computing devices of a dispersed storage network (DSN), causes the one or more computing devices to:
determine that a set of storage units of the DSN will be substantially used for read operations of dispersed storage error encoded data;
and
for the set of storage units:
determine a number of storage units to remove from the set of storage units based on a difference between a pillar width number regarding encoding of the dispersed storage error encoded data and a read threshold number regarding reading the dispersed storage error encoded data;
and
remove the number of storage units from the set of storage units.

4 more elements

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:
determine that a set of storage units of the DSN will be substantially used for read operations of dispersed storage error encoded data;
and
for the set of storage units:
determine an actual reliability that indicates a level of reliability in retrieving a decode threshold number of encoded data slices per read request of a plurality of read requests;
compare the actual reliability to a desired reliability of the set of storage units, wherein the desired reliability indicates a desired level of reliability in retrieving the decode threshold number of encoded data slices per read request of the plurality of read requests;
and
when the actual reliability exceeds the desired reliability by a reconfiguration threshold, remove one or more storage units from the set of storage units.

8 more elements

Dependencies are inferred from the claim text.

Adjusting a number of dispersed storage units

Life of this patent

Adjusting a number of dispersed storage units

Life of this patent

Abstract

Claims39