# US 9,436,654 B1 · Methods and systems for processing task management functions in a cluster having an intelligent storage adapter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,436,654 B1 - Document ID: US9436654B1 - Status: Granted - Kind: B1 - Application number: 14/312,130 - Filed: 2014-06-23 - Granted: 2016-09-06 - Earliest claimed: 2014-06-23 - Assignees: QLOGIC, Corporation - Applicants: QLOGIC, Corporation - Inventors: Anurag Verma - Web page: https://patentgrep.com/patent/US9436654B1 ## CPC - G06F 9/485: {Task life-cycle, e.g. stopping, restarting, resuming execution (G06F9/4881 takes precedence)} - G06F 12/0868: Data transfer between cache memory and other subsystems, e.g. storage devices or host systems - G06F 2212/1024: Latency reduction - G06F 2212/263: Network storage, e.g. SAN or NAS - G06F 2212/314: In storage network, e.g. network attached cache - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Methods and systems for processing task management requests are provided. A cache client adapter receives a task management request other than an abort for a logical storage object owned by a cache owner adapter and determines if there are any pending input/output (I/O) requests associated with the storage object. The cache client adapter sends an abort request to the cache owner adapter when there are pending I/O requests and sends the task management request directly to a controller that manages a storage device whose space is presented as the logical storage object; and sends only the task management request to the controller when there are no pending I/O requests for the logical storage object. ## Claims ### Claim 1 A machine implemented method, comprising; receiving a task management request other than an abort task request at a cache client adapter from a client system for a logical storage object that is presented to the client system by the cache client adapter while being owned and managed by a cache owner adapter that communicates with the cache client adapter via a network connection; wherein both the cache client adapter and the cache owner adapter communicate with a controller that manages a storage device whose storage space is used for the logical storage object to store data; determining by the cache client adapter if there are any pending input/output (I/O) requests associated with the logical storage object that have been sent to the cache owner adapter; sending an abort request by the cache client adapter to the cache owner adapter to abort pending I/O requests, when there are pending I/O requests; sending the task management request directly to the controller instead of the cache owner adapter; receiving a completion notification by the cache client adapter directly from the controller, after the task management request is executed; and notifying the client system of the completion by the cache client adapter. ### Claim 2 (depends on 1) The method of claim 1, wherein the logical storage object is a logical unit number (LUN). ### Claim 3 (depends on 2) The method of claim 2, wherein the LUN is based on a storage space at the storage device accessible via a storage area network. ### Claim 4 (depends on 2) The method of claim 2, wherein the task management request is a LUN reset request to reset the LUN. ### Claim 5 (depends on 1) The method of claim 1, further comprising receiving a second task management request that is an abort task request; and forwarding the second task management request to the cache owner adapter. ### Claim 6 (depends on 1) The method of claim 1, wherein the cache client adapter and the cache owner adapter operate within a cluster identified by a unique identifier. ### Claim 7 (depends on 1) The method of claim 1, wherein the cache client adapter maintains a data structure to track I/O requests that are sent to the cache owner adapter by the cache client adapter for the logical storage object to store data or read data. ### Claim 8 A non-transitory, machine readable storage medium storing executable instructions, which when executed by a machine, causes the machine to perform a method, the method comprising: receiving a task management request other than an abort task request at a cache client adapter from a client system for a logical storage object that is presented to the client system by the cache client adapter while being owned and managed by a cache owner adapter that communicates with the cache client adapter via a network connection; wherein both the cache client adapter and the cache owner adapter communicate with a controller that manages a storage device whose storage space is used for the logical storage object to store data; determining by the cache client adapter if there are any pending input/output (I/O) requests associated with the logical storage object that have been sent to the cache owner adapter; sending an abort request by the cache client adapter to the cache owner adapter to abort pending I/O requests, when there are pending I/O requests; sending the task management request directly to the controller instead of the cache owner adapter; receiving a completion notification by the cache client adapter directly from the controller, after the task management request is executed; and notifying the client system of the completion by the cache client adapter. ### Claim 9 (depends on 8) The storage medium of claim 8, wherein the logical storage object is a logical unit number (LUN). ### Claim 10 (depends on 9) The storage medium of claim 9, wherein the LUN is based on a storage space at the storage device accessible via a storage area network. ### Claim 11 (depends on 9) The storage medium of claim 9, wherein the task management request is a LUN reset request to reset the LUN. ### Claim 12 (depends on 8) The storage medium of claim 8, wherein the method further comprises: receiving a second task management request that is an abort task request; and forwarding the second task management request to the cache owner adapter. ### Claim 13 (depends on 8) The storage medium of claim 8, wherein cache client adapter and the cache owner adapter operate within a cluster identified by a unique identifier. ### Claim 14 (depends on 8) The storage medium of claim 8, wherein the cache client adapter maintains a data structure to track I/O requests that are sent to the cache owner adapter by the cache client adapter for the logical storage object to store data or read data. ### Claim 15 A system, comprising: a cache client adapter for receiving a task management request other than an abort from a client system for a logical storage object that is presented to the client system by the cache client adapter while being owned and managed by a cache owner adapter that communicates with the cache client adapter via a network connection and determining if there are any pending in-put/output (I/O) requests associated with the logical storage object; wherein the cache client adapter sends an abort request to the cache owner adapter to abort pending I/O requests and sends the task management request directly to a controller that manages a storage device whose space is presented as the logical storage object to store data; and wherein the controller executes the task management request and sends a completion notification directly to the cache client adapter that notifies the client system of the completion notification. ### Claim 16 (depends on 15) The system of claim 15, wherein the logical storage object is a logical unit number (LUN). ### Claim 17 (depends on 16) The system of claim 16, wherein the LUN is based on a storage space at the storage device accessible via a storage area network. ### Claim 18 (depends on 16) The system of claim 16, wherein the task management request is a LUN reset request to reset the LUN. ### Claim 19 (depends on 15) The system of claim 15, wherein when the cache client adapter accepts a task management request that is the abort task request, then the abort task request is forwarded by the cache client adapter to the cache owner adapter. ### Claim 20 (depends on 15) The system of claim 15, wherein the cache client adapter and the cache owner adapter operate within a cluster identified by a unique identifier. ### Claim 21 (depends on 15) The system of claim 15, wherein the cache client adapter maintains a data structure to track I/O requests that are sent to the cache owner adapter by the cache client adapter for the logical storage object to store data or read data.