Storing erasure coded data based on reliability of storage devices

A method, comprising,

• obtaining, by a system comprising a processor, reliability data for a group of storage devices;
• erasure coding data corresponding to a chunk data structure into data fragments and coding fragments;
• dividing, based on the reliability data, the storage devices of the group of storage devices into a higher reliability first subgroup of the group according to first reliabilities of reliabilities of the storage devices, a medium reliability second subgroup of the group according to second reliabilities of the reliabilities of the storage devices, and a lower reliability third subgroup of the group according to third reliabilities of the reliabilities of the storage devices;
• storing the data fragments, based on the reliability data, to the first subgroup of the group comprising first storage devices of the group of storage devices that are more reliable than the second subgroup of the group comprising second storage devices of the group of storage devices, wherein the storing the data fragments to the higher reliability first subgroup comprises storing the data fragments to the higher reliability first subgroup and to a first part of the medium reliability second subgroup;
• and
• storing the coding fragments, based on the reliability data, to the medium reliability second subgroup, wherein the storing the coding fragments to the medium reliability second subgroup comprises storing the data fragments to a second part of the medium reliability second subgroup and to the lower reliability third subgroup.

A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of a data storage system, facilitate performance of operations, the operations comprising:

• obtaining reliability data representative of respective reliabilities associated with a group of storage devices;
• determining, based on the reliability data, a higher reliability first subgroup of the group according to first reliabilities of the respective reliabilities, a medium reliability second subgroup of the group according to second reliabilities of the respective reliabilities, and a lower reliability third subgroup of the group according to third reliabilities of the respective reliabilities;
• allocating data fragments of a distributed chunk data structure on the higher reliability first subgroup, wherein the allocating the coding fragments of the distributed chunk to the higher reliability first subgroup comprises allocating the data fragments of the distributed chunk data structure to the higher reliability first subgroup and to a first part of the medium reliability second subgroup;
• and
• allocating coding fragments of the distributed chunk data structure on the medium reliability second subgroup, wherein the allocating the coding fragments of the distributed chunk data structure to the medium reliability second subgroup comprises allocating the data fragments of the distributed chunk data structure to a second part of the medium reliability second subgroup and to the lower reliability third subgroup.