Emc IP Holding Company LLC

Rongrong Shang

Xiaobo Zhang

Jian Gao

Haiying Tang

Geng Han

Xinlei Xu

Zhilong Wu

Vamsi K Vankamamidi

Ruiyong Jia

Changyu Feng

Shuyu Lee

Shuai Ni

Changrui Shao

Jibing Dong

Hongpo Gao

Amitai Alkalay

Lifeng Yang

Yousheng Liu

Shaoqin Gong

Jianbin Kang

Chun Ma

Xiongcheng Li

Ajay Karri

Sihang Xia

Zhenhua Zhao

Haiyun Bao

Baoan Yuan

A method, computer program product, and computing system for determining that one non-volatile random access memory (NVRAM) drive of a pair of NVRAM drives of a storage system is offline, thus defining an offline NVRAM drive and an online NVRAM drive. A virtual disk may be generated on a plurality of solid-state disks (SSDs) of the storage system. The contents of the online NVRAM drive may be copied to the virtual disk. The virtual disk may be exposed to the storage system as a representation of the offline NVRAM drive.

Storage management system and method

Techniques provide for managing storage devices. Such techniques involve: combining storage devices in a redundant array of independent disks into a group of storage devices in an order of physical capacities of the storage devices; determining a first number of sets of storage devices based on a number of storage devices in the group and a threshold number of storage devices to be divided into each of the sets; and dividing, based on a configuration of the redundant array of independent disks, the group of storage devices into the first number of sets of storage devices, to optimize an effective capacity of the redundant array of independent disks.

Method for managing storage devices, electronic device and computer-readable medium

Techniques for managing disks involve: determining, from multiple disks, a first disk set for providing redundant storage, the number of disks included in the first disk set being not less than a first threshold number that corresponds to the number of disks required to be included in a redundant array of independent disks; determining, based on the multiple disks, a candidate solution in which at least the first disk set is used to provide redundant storage; determining an unavailable capacity that the candidate solution will have; and determining, based on the unavailable capacity and the candidate solution, a target solution for providing the redundant storage. Accordingly, such techniques can promote efficient management of disks.

Method, electronic device and computer program product for managing disks

Techniques involve determining the number of disks in a Redundant Array of Independent Disks (RAID) storage system, and the storage system comprises multiple types of mixed disks. The techniques further involve determining a target number of RAID sets to be allocated in the storage system according to the number of disks and a predetermined threshold, and then allocating the multiple types of disks to the RAID sets according to the target number and types of disks. Such techniques propose a way to allocate mixed disks to the corresponding RAID sets. When the RAID set grouping is performed to mixed disks of the storage system, the same type of disks are allocated in the same RAID set as much as possible, thereby improving the performance of the storage system.

Method, device and computer program product for storage

Techniques are directed to managing Redundant Array of Independent Disks (RAID) storage space. One technique involves providing, by RAID circuitry, a storage space request to mapper circuitry; receiving, by the RAID circuitry, a storage space reply from the mapper circuitry in response to the storage space request; and performing, by the RAID circuitry, a follow-up operation based on the storage space reply from the mapper circuitry. Another technique involves, receiving, by mapper circuitry, a storage space request from RAID circuitry; performing, by the mapper circuitry, a storage space management operation in response to the storage space request; and providing, by the mapper circuitry, a storage space reply to the RAID circuitry, the storage space reply identifying a result of the storage space management operation.

Providing coordination between mapper circuitry and redundant array of independent disks (RAID) circuitry to manage RAID storage space

Techniques involve determining a first slice distribution used to build first storage units in a first pool; in response to a determination that the first pool is expanded to a second pool, determining, at least based on a sum of the slices having been used to build the first storage units, a second slice distribution of updated slices used to build the first storage units in the second pool; determining, based on the first distribution and the second distribution, a first available number of slices and a second available number of slices available for building second storage units in the second pool, the second storage units being different from the first storage units; and determining, at least based on the first available number and the second available number, the number of the second storage units allowed to be built. Accordingly, available capacity allowed for building can be accurately estimated.

Method for storage management, electronic device and computer program product

A storage system comprises stripes, extents comprised in one stripe among the stripes residing on storage devices in the storage system, respectively. A failed stripe is determined among the stripes, the failed stripe comprising a group of failed extents residing on a group of failed storage devices, respectively, a number of failed storage devices in the group being less than or equal to parity width of the storage system. Distribution of the group of failed extents in the failed stripe is obtained. A rebuild parameter for rebuilding data in the failed stripe is generated based on the obtained distribution. The generated rebuild parameter is stored for rebuilding the storage system. Accordingly, a rebuild parameter generated for one failed stripe is reused for other failed stripe with the same distribution. The performance of rebuild operations may be improved, and time of rebuild operations may be reduced.

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

Techniques for managing disks involve: in response to a number of a plurality of disks to be partitioned being greater than a predetermined number of disks in a disk set, determining a plurality of candidate combinations of disk sets from the plurality of disks. The techniques further involve selecting a target combination from the plurality of candidate combinations, a first disk set of the target combination comprising at least a first subset corresponding to a first disk array, a second disk set of the target combination comprising at least a second subset corresponding to a second disk array, a number of disks in the first subset and a number of disks in the second subset being both equal to a first number and the disks in the first subset being different from the disks in the second subset. Accordingly, such techniques improve the storage efficiency of the disk array.

Techniques for processing data involve: receiving a request for moving data from a first slice group in a first logical unit to a second logical unit; determining, based on the request, a second slice group from the second logical unit, the size of the second slice group being larger than or equal to the size of the first slice group; and moving data in the first slice group into the second slice group. Such techniques enable moving data into slices in a specified address range in a specified logical unit, moving data into appropriate slices in a target logical unit when data cannot be moved to slices in a specific address range because an address range is not specified or a specified address range is unavailable can be achieved, and moving disk extents (DEs) by a Redundant Array of Multi-Core Disks (MCR) and redistributing IOs between disk extents.

Moving data from a first group of slices to a second group of slices

Techniques involve determining whether data read from a redundant array of independent disks (RAID) is corrupted, the RAID including two parity disks. The techniques further involve determining, based on the read data being corrupted, whether single-disk data recovery can recover the corrupted data. The techniques further involve recovering, based on the single-disk data recovery failing to recover the corrupted data, the corrupted data using dual-disk data recovery. Such techniques may present a recovery solution for silent data corruption of a RAID with two parity disks, such that corrupted data can be recovered in the case of either a single-disk failure or a dual-disk failure, thereby improving the storage system performance.

Method, device and computer program product for recovering data

Techniques involve determining a stripe width of an array and metadata of candidate disks available for allocating a new array, the metadata indicating a total slice number in each of the candidate disks and a number of used slices in the candidate disks. The techniques further involve determining, based on the width and the total slice number, a first number of slices in the candidate disks that are available. The techniques further involve determining, based on the number of the used slices, a second slice number in the used slices that are available; and determining, based on the first number and the second number, utilization rates of the candidate disks for the allocation for the new array. Such techniques may make the utilization rates of the candidate disks more accurate, which ensures uniform use of the respective candidate disks and improves the performance of the candidate disks.

Method, electronic device and computer program product for managing disk array

Techniques involve: in response to adding a second set of disks into a redundant array of independent disks (RAID) including a first set of disks and a total number of disks in the first and second sets exceeding a predetermined threshold, determining types and numbers of disks in the first and second sets, respectively; determining, based on the types and numbers of the disks determined and a performance indicator of the RAID having the added second set, respective types and numbers of disks comprised in a plurality of sets to which the disks in the RAID are to be allocated; and performing, based on the type and number of disks in the first set and the respective types and numbers of disks, an allocation of a disk in the first set to one of the plurality of sets, until all the disks in the first set have been allocated.

Method, electronic device and computer readable storage medium for storage management

Techniques for storage management involve: acquiring capacities of a plurality of disks configured to provide redundant storage; determining, based on the capacities of the plurality of disks, a first total capacity corresponding to a first candidate scheme of the redundant storage and a second total capacity corresponding to a second candidate scheme of the redundant storage, all of the plurality of disks being used in the first candidate scheme, and a part of the plurality of disks being used in the second candidate scheme; and determining a target scheme of the redundant storage from the first candidate scheme and the second candidate scheme based on the first total capacity and the second total capacity. Accordingly, an optimal disk configuration scheme can be selected to generate an optimal disk group, so as to improve storage capability and storage management efficiency.

Method, electronic device and computer program product for storage management

Techniques for mapping large storage extents ('ubers') into storage drive groups ('resiliency groups') in a data storage system. The techniques can include, as the capacity of storage drives included in a first resiliency group is used up, forming a second resiliency group with one or more new storage drives. The disclosed techniques can further include allocating one or more storage drives from the first resiliency group to the second resiliency group to satisfy a requirement of a predetermined RAID storage configuration, and performing a reduced number of data movement operations to assure that data slices of one or more ubers initially assigned to the first resiliency group are allocated to storage drives in the same first or second resiliency group. In this way, data storage systems can be made to support a desired storage drive expansion with a reduced number of new storage drives.

Mapping storage extents into resiliency groups

In accordance with certain techniques, at a first processor of a dual-processor storage system, a change in an initial logical unit corresponding to a storage area in a physical storage device of the storage system is detected. Based on the change in the initial logical unit, a plurality of update operations to be performed on a mapped logical unit driver mapping a plurality of initial logical units including the initial logical unit to a plurality of mapped logical units are determined. An indication of the plurality of update operations is sent to a second processor of the storage system, to cause the second processor to perform the plurality of update operations on a peer mapped logical unit driver associated with the mapped logical unit driver.

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Beijing, China

Rongrong Shang