# US 12,192,306 B2 · Method to provide SLA based access to cloud data in backup servers with multi cloud storage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,306 B2 - Document ID: US12192306B2 - Status: Granted - Kind: B2 - Application number: 17/350,203 - Filed: 2021-06-17 - Published: 2022-12-22 - Granted: 2025-01-07 - Earliest claimed: 2021-06-17 - Assignees: EMC IP Holding Company LLC - Applicants: EMC IP Holding Company LLC - Inventors: Kalyan C. Gunda; Jagannathdas Rath; Santi Gopal Mondal; Arun Vishnu Pk; Veera Venkata Prasad Jagarlamudi - Web page: https://patentgrep.com/patent/US12192306B2 ## CPC - H04L 41/5019: Ensuring fulfilment of SLA - H04L 67/61: taking into account QoS or priority requirements - G06F 3/0614: {Improving the reliability of storage systems} - G06F 3/0635: {by changing the path, e.g. traffic rerouting, path reconfiguration} - G06F 3/067: {Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]} - G06F 11/3034: {where the computing system component is a storage system, e.g. DASD based or network based (digital input from or digital output to record carriers G06F3/06; digital recording or reproducing G11B20/18; for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS], H04L67/1097)} - G06F 11/3409: {for performance assessment} - H04L 41/5096: {wherein the managed service relates to distributed or central networked applications} - H04L 63/102: {Entity profiles} - H04L 67/1008: based on parameters of servers, e.g. available memory or workload (monitoring of computer activity G06F11/30) - H04L 67/1014: based on the content of a request - H04L 67/1023: based on a hash applied to IP addresses or costs - H04L 67/1097: for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS] - H04L 67/53: using third party service providers - G06F 11/2094: {Redundant storage or storage space (G06F11/2056 takes precedence)} - G06F 16/27: Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor - H04L 43/0852: Delays - H04L 43/0894: Packet rate - H04L 43/16: Threshold monitoring - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract The disclosure provides a system, computer readable medium, and computer-implemented method for managing data access. The method includes obtaining a data access request from a requestor for client data redundantly stored in at least two storage providers that are unknown to the requestor; identifying a service level objective for servicing the data access request; ranking the at least two storage providers based on the service level objective to identify one of the at least two storage providers to service the data access request; and providing the requestor with access to a copy of the client data using the one of the at least two storage providers. ## Claims ### Claim 1 A computer-implemented method for managing data access, the method 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. ### Claim 2 (depends on 1) The computer-implemented method of claim 1, wherein the data access request is a read request. ### Claim 3 (depends on 1) The computer-implemented method of claim 1, wherein the controlling metric specifies a minimum characteristic for accessing the client data that must be met to meet the service level objective. ### Claim 4 (depends on 3) The computer-implemented method of claim 3, wherein the non-controlling metric specifies a characteristic for accessing the client data that impacts a quality of the data access provided to the requestor and for which each of the portion of the plurality of storage providers are relatively ranked with respect to each other. ### Claim 5 (depends on 1) The computer-implemented method of claim 1, wherein ranking the portion of the plurality of storage providers comprises: generating an objective function based on metrics specified by the service level objective; and ordering the portion of the plurality of storage providers based on the objective function, wherein the data access request is a read request. ### Claim 6 (depends on 5) The computer-implemented method of claim 5, wherein the metrics comprise at least one of a maximum access latency for the client data, a maximum duration of time for accessing the client data, a maximum cost for accessing the client data, a relative performance ranking of the portion of the plurality of storage providers, and a relative archival performance ranking of the portion of the plurality of storage providers, and a relative cost ranking for the portion of the plurality of storage providers. ### Claim 7 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. ### Claim 8 (depends on 7) The non-transitory machine-readable medium of claim 7, wherein the data access request is a read request. ### Claim 9 (depends on 7) The non-transitory machine-readable medium of claim 7, wherein the controlling metric specifies a minimum characteristic for accessing the client data that must be met to meet the service level objective. ### Claim 10 (depends on 9) The non-transitory machine-readable medium of claim 9, wherein the non-controlling metric specifies a characteristic for accessing the client data that impacts a quality of the data access provided to the requestor and for which each of the portion of the plurality of storage providers are relatively ranked with respect to each other. ### Claim 11 (depends on 7) The non-transitory machine-readable medium of claim 7, wherein ranking the portion of the plurality of storage providers comprises: generating an objective function based on metrics specified by the service level objective; and ordering the portion of the plurality of storage providers based on the objective function, wherein the data access request is a read request. ### Claim 12 (depends on 11) The non-transitory machine-readable medium of claim 11, wherein the metrics comprise at least one of a maximum access latency for the client data, a maximum duration of time for accessing the client data, a maximum cost for accessing the client data, a relative performance ranking of the portion of the plurality of storage providers, and a relative archival performance ranking of the portion of the plurality of storage providers, and a relative cost ranking for the portion of the plurality of storage providers. ### Claim 13 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. ### Claim 14 (depends on 13) The data processing system of claim 13, wherein the data access request is a read request. ### Claim 15 (depends on 13) The data processing system of claim 13, wherein the controlling metric specifies a minimum characteristic for accessing the client data that must be met to meet the service level objective. ### Claim 16 (depends on 15) The data processing system of claim 15, wherein the non-controlling metric specifies a characteristic for accessing the client data that impacts a quality of the data access provided to the requestor and for which each of the portion of the plurality of storage providers are relatively ranked with respect to each other. ### Claim 17 (depends on 13) The data processing system of claim 13, wherein ranking the portion of the plurality of storage providers comprises: generating an objective function based on metrics specified by the service level objective; and ordering the portion of the plurality of storage providers based on the objective function, wherein the data access request is a read request. ### Claim 18 (depends on 17) The data processing system of claim 17, wherein the metrics comprise at least one of a maximum access latency for the client data, a maximum duration of time for accessing the client data, a maximum cost for accessing the client data, a relative performance ranking of the portion of the plurality of storage providers, and a relative archival performance ranking of the portion of the plurality of storage providers, and a relative cost ranking for the portion of the plurality of storage providers.