Method to provide SLA based access to cloud data in backup servers with multi cloud storage

A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations for managing data access, the operations comprising:

• receiving a data access request from a requestor for client data, wherein the client data was previously redundantly stored in a plurality of storage providers that are unknown to the requestor;
• responsive to receiving the data access request:
• identifying a service level objective for servicing the data access request, wherein the service level objective specifies a controlling metric and a non-controlling metric, the controlling metric comprising a minimum bandwidth to be met by a storage provider;
• determining an operational performance of each of the plurality of storage providers that currently store the client data;
• identifying a portion of the plurality of storage providers that meet the controlling metric based on their corresponding operational performance;
• ranking, based on the non-controlling metric, only the portion of the plurality of storage providers that currently store the client data, wherein the non-controlling metric is at least based on a cost to access the client data;
• identifying a first storage provider from the portion of the plurality of storage providers based on the ranking;
• copying a first portion of data blocks corresponding to the client data from the first storage provider;
• subsequent to copying the first portion of data blocks corresponding to the client data from the first storage provider, and prior to copying a second portion of data blocks corresponding to the client data, determining that the first storage provider has become inaccessible;
• in response to the first storage provider becoming inaccessible, using the ranking of the portion of the plurality of storage providers to identify a second storage provider;
• copying the second portion of data blocks corresponding to the client data from the second storage provider;
• and
• reconstructing the client data using the first portion of data blocks and the second portion of data blocks to produce reconstructed client data;
• and
• providing, to the requestor, access to the reconstructed client data.

A data processing system for managing data access, comprising:

• a processor;
• and
• a memory coupled to the processor to store instructions, which when executed by the processor, cause the processor to perform operations, the operations comprising:
• receiving a data access request from a requestor for client data, wherein the client data was previously redundantly stored in a plurality of storage providers that are unknown to the requestor;
• responsive to receiving the data access request:
• identifying a service level objective for servicing the data access request, wherein the service level objective specifies a controlling metric and a non-controlling metric, the controlling metric comprising a minimum bandwidth to be met by a storage provider;
• determining an operational performance of each of the plurality of storage providers that currently store the client data;
• identifying a portion of the plurality of storage providers that meet the controlling metric based on their corresponding operational performance;
• ranking, based on the non-controlling metric, only the portion of the plurality of storage providers that currently store the client data, wherein the non-controlling metric is at least based on a cost to access the client data;
• identifying a first storage provider from the portion of the plurality of storage providers based on the ranking;
• copying a first portion of data blocks corresponding to the client data from the first storage provider;
• subsequent to copying the first portion of data blocks corresponding to the client data from the first storage provider, and prior to copying a second portion of data blocks corresponding to the client data, determining that the first storage provider has become inaccessible;
• in response to the first storage provider becoming inaccessible, using the ranking of the portion of the plurality of storage providers to identify a second storage provider;
• copying the second portion of data blocks corresponding to the client data from the second storage provider;
• and
• reconstructing the client data using the first portion of data blocks and the second portion of data blocks to produce reconstructed client data;
• and
• providing, to the requestor, access to the reconstructed client data.