Avago Assigned Six Patents

Leased lock in active-active high availability DAS systems
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, with LSI Logic, San Jose, Ca, for applicant, has been assigned a patent (9,244,868) developed by Samanta, Sumanesh, Biswas, Sujan, Bangalore, India, and Simionescu, Horia, Foster City, CA, for a “leased lock in active-active high availability DAS systems.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A method and system for IO processing in a storage system is disclosed. In accordance with the present disclosure, a controller may take long term ‘lease’ of a portion, (e.g., an LBA range) of a virtual disk of a RAID system and then utilize local locks for IOs directed to the leased portion. The method and system in accordance with the present disclosure eliminates inter-controller communication for the majority of IOs and improves the overall performance for a High Availability Active-Active DAS RAID system.“

The patent application was filed on September 21, 2012 (13/623,909).

Detecting media flaws
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, with LSI Logic, San Jose, Ca, for applicant, has been assigned a patent (9,244,752) developed by Qin, Dahua, Allentown, PA, Zhang, Xun, Westford, MA, and Xia, Haitao, San Jose, CA, for a “systems and methods for detecting media flaws.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”An apparatus for detecting media flaws includes a branch metric selection circuit operable to select a first branch metric and a second branch metric, a subtraction circuit operable to subtract the second branch metric from the first branch metric to yield a difference, and a comparator operable to compare the difference with a threshold value and to indicate a presence of a potential flaw in a storage medium when the difference is less than the threshold value.“

The patent application was filed on June 6, 2013 (13/912,109).

Input/output request shipping in storage system with multiple storage
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, with LSI Logic, San Jose, Ca, for applicant, has been assigned a patent (9,229,654) developed by Madhusudana, Naresh, and Krishnamurthy, Naveen, Bangalore, India, for a “input/output request shipping in a storage system with multiple storage.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Systems and methods presented herein provide for input/output shipping between storage controllers in a storage system. One storage system comprises a plurality of logical volumes, a host driver operable to process input/output requests to the logical volumes, and a plurality of storage controllers coupled between the server and the logical volumes. A first of storage controllers is operable to receive an input/output request from the host driver for one of the logical volumes, and transfer a command to a second of the storage controllers to retrieve the data of the input/output request. The second storage controller processes the command from the first storage controller, and retrieves the data associated with the input/output request.“

The patent application was filed on February 5, 2014 (14/173,540).

Update systems responsive to ongoing processing at storage system
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, has been assigned a patent (9,223,564) developed by Munireddy, Madan Mohan, Bangalore, India, and Tiwari, Prafull, Lucknow, India, for a “update systems responsive to ongoing processing at a storage system.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Methods and systems for updating devices of a storage system are provided. The system comprises a management system and at least one client system. The management system contacts a network-accessible portal providing updates for firmware residing on storage system devices. The client system is coupled for communication with the management system and comprises one or more storage system devices. The management system acquires version information for the storage system devices of the client system, and compares the version information for the storage system devices to version information accessible via the portal to determine whether to download updates from the portal. The client system downloads an update from the management system, determines a volume of activity at a storage system device, and pushes the update to the storage system device if the volume of activity is below a threshold.“

The patent application was filed on January 26, 2012 (13/359,314).

Multi-head balancing in storage device
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, with LSI Logic, San Jose, Ca, for applicant, has been assigned a patent (9,218,845) developed by Pan, Lu, Xia, Haitao, San Jose, CA, Zhang, Haotian, Longmont, CO, and Cao, Rui, San Jose, CA, for a “systems and methods for multi-head balancing in a storage device.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Systems and method relating generally to data processing, and more particularly to systems and methods for utilizing multiple data streams for data recovery from a storage device. As an example, a data processing system is discussed that includes a first read head and a second read head each operable to sense information on a storage medium. A synthesizer circuit is operable to determine a quality metric based upon a signal to noise ratio of a first preamble pattern compared with a signal to noise ratio of a second preamble pattern. A balancing circuit is operable to generate a composite output as a combination of a first data set derived from the first read head a second data set derived from the second read head based at least in part on the quality metric.“

The patent application was filed on January 6, 2014 (14/148,306).

Fault detection and identification in multi-initiator system
Avago Technologies General IP, (Singapore) Pte. Ltd., Singapore, with LSI Logic, San Jose, Ca, for applicant, has been assigned a patent (9,213,588) developed by Nair, Naman, Fremont, CA, Besmer, Brad D., Rivera, Peter C., Colorado Springs, CO, and Rizzo, James, Austin, TX, for a “fault detection and identification in a multi-initiator system.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A storage system and method for identifying a faulty link the storage system is disclosed. The storage system includes a plurality of target devices and at least one expander configured to communicatively couple a plurality of initiators to the plurality of target devices. Each initiator of the plurality of initiators monitors occurrences of link disruptions independently, wherein upon detecting occurrences of a predetermined number of link disruptions within a predetermined time period, a reporting initiator reports a detection of a faulty link in the multi-initiator topology and requests an arbitrator to identify at least one peer initiator in the multi-initiator topology that shares at least one shared link with the reporting initiator. This reporting initiator and its peer initiators then jointly execute a common diagnostic process to identify the faulty link in the multi-initiator topology.“

The patent application was filed on January 28, 2014 (14/166,280).