Emc IP Holding Company LLC

Dell Products Inc.

Jamin Jianbin Kang

Jian Gao

Geng Han

Hongpo Gao

Jibing Dong

Xinlei Xu

Shaoqin Gong

Ree Sun

Wayne Li

Lifeng Yang

Yousheng Liu

Ruiyong Jia

Baote Zhuo

Michael P Wahl

Ilya Usvyatsky

Liam Xiongcheng Li

Naizhong Chiu

Huibing Xiao

Philippe Armangau

Vamsi K Vankamamidi

Changyu Feng

Sheng Wang

Shuyu Lee

Lili Chen

Tao Xu

Ronald D Proulx

Qingyun Liu

Huadong Li

Charles Ma

A system can determine to generate error correction codes for a storage system that comprises computing nodes. The system can logically divide the computing nodes into disjunctive subsets. The system can, for each disjunctive subset, create a partition, and identify a group of elements that comprises sub-strips of the disjunctive subset. The system can add a first element from each disjunctive subset of the disjunctive subsets to the partition, and removing the first element from the group of elements. The system can, for each disjunctive subset, add a second element from the group of elements along with elements stored in parity notes of a sub-strip where the second element is located. The system can, in response to determining that a number of elements of the disjunctive subset is at least as large as a number of the computing nodes, create the error correction codes based on the elements.

HashTag codes for reduced repair bandwidth

A data storage technique involves determining one or more storage allocation units from a virtual storage region corresponding to a disk set including a plurality of disks. The technique further involves allocating a virtual storage unit to the one or more storage allocation units. The technique further involves storing a mapping relationship of the virtual storage unit with respect to the virtual storage region and the one or more storage allocation units. Accordingly, the granularity of each virtual storage unit can be reduced, so that storage resources can be invoked more accurately, and the storage space can be saved.

Method, electronic device, and computer program product for data storage

A method, computer program product, and computing system for allocating a first set of cores of a plurality of cores of a multicore central processing unit (CPU) for processing host input-output (IO) operations of a plurality of operations on a storage system. A second set of cores of the plurality of cores may be allocated for processing flush operations of the plurality of operations on the storage system. A third set of cores of the plurality of cores may be allocated for processing rebuild operations of the plurality of operations on the storage system. At least one of one or more host IO operations, one or more rebuild operations, and one or more flush operations may be processed, via the plurality of cores and based upon, at least in part, the allocation of the plurality of cores for processing the plurality of operations.

System and method for allocating central processing unit (CPU) cores for system operations

Embodiments of the present disclosure relate to a method, device and a computer program product for managing a storage system. The storage system includes a disk array. A method includes determining, based on a first number of disks in the disk array, a second number of spare disks for the disk array. The method further includes creating a spare disk array with the second number of spare disks. The method further includes, in response to a first disk in the disk array failing, allocating a spare logic storage unit from the spare disk array for rebuilding the first disk. In addition, the method further includes rebuilding the first disk with the spare logic storage unit.

Method, device and computer program product for managing storage system

A technique provides a RAID resiliency set from a plurality of storage devices. The technique involves identifying a minimum sub-RRS width based on a predefined RAID level to be enforced on the RRS. The technique further involves, based on the minimum sub-RRS width, allocating segments from the plurality of storage devices to create a maximum number of sub-RRSs. The technique further involves forming the RRS from the created maximum number of sub-RRSs.

Providing a RAID resiliency set from a plurality of storage devices

A method and system for managing a storage system, the method comprising: creating a storage system including a first number of stripes, wherein each of the first number of stripes includes a second number of extents, and each of the second number of extents is distributed over a different storage device in a group of storage devices; with respect to a stripe among the first number of stripes, generating stripe information descriptive of a mapping relation between the second number of extents included in the stripe and the different storage devices in the group of storage devices; and with respect to a storage device where an extent among the second number of extents is located, building extent information about a mapping relation between an extent in the storage device and the stripe. In one embodiment of the present invention, there is provided a corresponding device and system.

Method and system for managing storage system

A system and method of recognizing a hard disk movement, the system and method including recognizing hard disk information recorded in a hard disk in response to the hard disk being moved to a slot in a hard disk array, determining the movement type of the hard disk based on the recognized hard disk information, judging validity of the hard disk movement based on the movement type, and updating the hard disk information of the hard disk in response to the hard disk movement being judged as valid, wherein the hard disk information comprises position information of the hard disk in the hard disk array.

Recognizing hard disk movement

In a method and apparatus for storage management, a method includes: creating a plurality of profiles for address mapping, the profiles comprising a part of mapping relation in the total mapping table and creating an index for a part of the plurality of profiles to accelerate the lookup speed. A corresponding device and computer program product are also disclosed.

Method and device for storage management

Embodiments of the present disclosure provide a method of managing a disk pool, the disk pool having a plurality of disks which are divided into a plurality of disk extents, the method comprising: determining the number of input/output (I/O) requests for disk extents in the disk pool within a predetermined period of time; determining respective hotness of the disk extents based on the number of I/O requests; determining hotness of the disks based on the hotness of the disk extents; and determining migration of data in the disk extents based on the hotness of the disk.

Method and device for managing disk pool

A method and device of managing storage array configuration. The method includes storing a basic configuration information of a user drive onto a system drive, storing an extended configuration information of the user drive onto the user drive, and, in response to a change of the storage array, creating a new disk array group or updating a disk array group according to the basic configuration information and the extended configuration information.

Managing storage array configuration

Implementations of the subject matter described herein provide a storage management method and system. The storage management method comprises: in response to receiving a write request, dividing data to be written into a plurality of data blocks with a predetermined size, the plurality of data blocks having their respective logic block addresses; evenly mapping, based on the logic block addresses, the plurality of data blocks to a plurality of RAID extents of a Redundant Array of Independent Disks (RAID); mapping the plurality of data blocks in the plurality of RAID extents to the disk, so that the plurality of data blocks are distributed in order of size of logic block addresses in the disk.

Processing I/O requests using a redundant array of independent disks (RAID)

A method and a system for delivering a message in a storage system. In one embodiment of the present invention, there is provided a method for delivering a message in a storage system comprising a first controller, a second controller, a first communication area and a second communication area. The method comprises: in response to receiving a message that is to be delivered from the first controller to the second controller, writing the message to the first communication area that is readable and writable to the first controller and readable to the second controller; and writing an address identifier to the second communication area, the address identifier being used for indicating an address at which the second controller reads the message from the first communication area, the second communication area being readable to the first controller and readable and writable to the second controller.

Method and system for delivering message in storage system

Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure there is provided a method for managing a storage system. The method comprises: dividing a source device among a plurality of storage devices in the storage system into a plurality of extents; copying data in the plurality of extents to a destination device; determining the state of an extent among the plurality of extents on the basis whether data in the extent among the plurality of extents has been copied to the destination device; and managing an access request to the extent on the basis of the state of the extent. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Method, system, and computer program product for managing storage system

A method, computer program product, and computer system for receiving, by a computing device, an I/O request for data. A number of storage devices of a plurality of storage devices in a Mapped RAID group that will be used to process the I/O request may be determined. It may be determined that each storage device of the number of storage devices in the Mapped RAID group that will be used to process the I/O request lacks a respective threshold number of credits to process the I/O request. It may be determined whether a cache associated with the Mapped RAID group allows a user I/O queue. If the cache allows the user I/O queue, a user I/O may be placed in the user I/O queue. If the cache does not allow the user I/O queue, the I/O request may be failed.

System and method for improving I/O performance by introducing extent pool level I/O credits and user I/O credits throttling on Mapped RAID

Implementations of the present disclosure relate to a method, system and computer program product for managing a storage system. Specifically, in one implementation of the present disclosure there is provided a method for managing a storage system. The storage system comprises at least one stripe, a stripe of the at least one stripe comprising multiple extents among which respective extents being from respective storage devices in a resource pool. The method comprises: in response to receiving a converting request to convert the storage system from a first type to a second type, determining a target storage device associated with the converting request in the resource pool; for a stripe of the at least one stripe, updating metadata associated with the stripe so as to remove from the stripe an extent that is located at the target storage device; and converting the storage system from the first type to the second type on the basis of the updated metadata. In other implementations of the present disclosure, there is provided a corresponding system and computer program product.

Growing community of inventors

Beijing, China

Jamin Jianbin Kang