Abstract: 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.

Abstract: Techniques perform I/O management. The techniques involve: in response to receiving an I/O request for a redundant array of independent disks (RAID), placing the I/O request in a corresponding waiting queue based on a stripe related to the I/O request in the RAID; and in response to the I/O request being granted to process, executing the I/O request based on storage of data of the stripe in a cache memory. Accordingly, by using the cache mechanism for the stripes, the I/O processing efficiency is improved and the user experience is enhanced. Moreover, the count of access to the RAID is reduced, the bandwidth for the backend access is saved and the system performance is improved.

Abstract: Techniques manage a storage system. Such techniques involve: determining an expected input/output (I/O) concurrency number of an access request for a storage system, the access request being associated with a first one of a plurality of redundant arrays of independent disks (RAIDs) comprised in the storage system; in response to a current available I/O concurrency number of the first RAID being less than the expected I/O concurrency number, increasing the available I/O concurrency number of the first RAID based on a reserved I/O concurrency number of the storage system; and performing the access request using the first RAID having the increased available I/O concurrency number.

Abstract: Embodiments of the present disclosure relate to a method, a device and a computer readable medium for managing a storage system. The method can determine a mapping between a logical storage extent and a plurality of storage devices in a storage pool without storing a table of the mapping. Further, the method can record a new mapping after a storage devices fails and restore the original mapping after the failed storage device is replaced.

Abstract: Embodiments of the present disclosure relate to methods, devices and computer readable mediums for managing a storage system. The storage system includes a disk array which includes at least one disk array group. The method comprises in response to receiving a first message indicating that a failure occurs in a disk in the disk array, determining first information on a disk array group that the failed disk belongs to. The method further comprises obtaining a first number of outstanding input/output (I/O) operations on rebuilding the failed disk in the disk array group. The method further comprises determining, based on the first information and the first number, a threshold number of I/O operations that is applicable for the disk array group. In addition, the method further comprises controlling, based on the threshold number, the number of I/O operations initiated to the disk array group.

Abstract: Embodiments of the present disclosure provide a method and device for RAID rebuilding. In some embodiments, there is provided a computer-implemented method. The method comprises: determining a spare redundant array of independent disks (RAID) group with spare capacity from a plurality of disks included in at least one RAID group of a storage pool; building spare logic units from the spare RAID group; and in response to a RAID group of the at least one RAID group of the storage pool being in a degradation state, rebuilding a failed disk in a degraded RAID group using the spare logic units.

Abstract: In response to detecting that a total number of physical data storage drives in a group of physical data storage drives exceeds a maximum drive group size, the group of physical data storage drives is divided into a multiple partnership groups, and RAID extents in a RAID mapping table are divided into multiple RAID extent groups. Each one of the RAID extent groups contains multiple RAID extents and corresponds to one of the partnership groups of physical data storage drives. The RAID extents in each RAID extent group only indicate physical data storage drives contained in the corresponding partnership group of physical data storage drives, in order to ensure that data recovery and RAID extent rebuilding after a drive failure involve only the physical data storage drives within the same partnership group as the failed physical data storage drive.

Abstract: The present invention discloses a method and device for managing a storage system. Specifically, in one embodiment of the present invention, there is proposed a method for managing a storage system, the storage system comprising a buffer device and a plurality of storage devices. The method comprises: receiving an access request with respect to the storage system; determining a storage device among the plurality of storage devices has been failed; and in response to the access request being an access request with respect to the failed storage device, serving the access request with data in the buffer device so as to reduce internal data access in the storage system. In one embodiment of the present invention, there is proposed a device for managing a storage system.

Abstract: A method and system for managing a buffer device in a storage system. The method comprising determining a first priority for a first queue included in the buffer device, the first queue comprising at least one data page associated with a first storage device in the storage system; in at least one round, in response to the first priority not satisfying a first predetermined condition, updating the first priority according to a first updating rule, the first updating rule making the updated first priority much closer to the first predetermined condition than the first priority; and in response to the first priority satisfying the first predetermined condition, flushing data in a data page in the first queue to the first storage device.

Abstract: 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.

Abstract: Methods pattern a sacrificial material on an etch mask into mandrels using optical mask lithography, form a conformal material and a fill material on the mandrels, and planarize the fill material to the level of the conformal material. Such methods pattern the fill material into first mask features using extreme ultraviolet (EUV) lithography. These methods partially remove the conformal material to leave the conformal material on the sidewalls of the mandrels as second mask features. Spaces between the first mask features and the second mask features define an etching pattern. The spacing distance of the mandrels is larger than the spacing distance of the second mask features. Such methods transfer the etching pattern into the etch mask material, and subsequently transfer the etching pattern into an underlying layer. Openings in the underlying layer are filled with a conductor to form wiring in the etching pattern.

Abstract: a method and an apparatus for maintaining reliability of a mapped redundant array of independent disks. The method comprises: determining a first data loss probability, the first data loss probability indicating reliability of a traditional redundant array of independent disks; determining a second data loss probability, the second data loss probability indicating reliability of the mapped redundant array of independent disks; and determining, based on the first and second data loss probabilities, a condition for maintaining the reliability of the mapped redundant array of independent disks. Compared with the prior art, embodiments of the present disclosure can effectively predict the reliability of a mapped RAID through comparison with a traditional RAID, so as to be capable of determining a reliability relationship between the traditional RAID and the mapped RAID. In this way, the reliability of the traditional RAID will not be degraded when being expanded into the mapped RAID.

Abstract: Embodiments of the present disclosure provide a method and an apparatus for storage management. For example, there is provided a method comprising: 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.

Abstract: Techniques manage a storage device. Such techniques involve: in response to receiving an I/O request for a storage device comprising a plurality of disks, determining, from the plurality of disks, at least one disk related to the I/O request; allocating, to each of the at least one disk, at least one access credit for completing the I/O request from total access credits of the disk, wherein the total access credits are associated with at least one of a type of the disk, a type of the I/O request and performance of the disk; and in response to respective access credits being allocated to the at least one disk, performing access requested by the I/O request to each of the at least one disk. Such techniques can effectively improve the overall access performance of the storage device.

Abstract: Techniques involve: determining processing power of a plurality of storage devices in a plurality of storage pools, the storage devices in each of the storage pools having a same device type; dividing the plurality of storage devices into a plurality of sets based on the processing power, a difference in the processing power between the storage devices in each of the sets being below a predetermined threshold; and redistributing, among the plurality of sets, data stored in the plurality of storage devices based on workloads of the storage devices in the sets. Accordingly, load balancing of storage devices in the plurality of storage pools can be implemented, response speed of the storage system can be enhanced and storage resources in the plurality of storage pools can be exploited more sufficiently.

Abstract: A technique involves: in response to establishing a stripe in a Redundant Array of Independent Disks (RAID), generating first mapping information of the stripe in a block allocated for the stripe, the RAID being built based on extents obtained by dividing disks, the stripe including a first extent set, the first mapping information recording respective disk locations of the first extent set; in response to a failure occurring in a first disk where a first extent in the first extent set is located, replacing the first extent with a second extent to obtain a second extent set corresponding to the stripe; generating second mapping information of the stripe in the block, to record respective disk locations of the second extent set; and in response to the first disk being recovered from the failure, restoring data in the stripe based on the first mapping information and the second mapping information.

Abstract: A technique involves: in response to receiving a request to write data to a storage device, acquiring metadata of a redundant array of independent disks (RAID) extent that is associated with the request to write data, the RAID extent being built based on disk slices comprised in a plurality of disks of the storage device; determining, based on the metadata, a disk slice of data write-enabled RAID extent to write the data; and copying an identification and a degradation number into a metadata page associated with a mapper for data recovery, the identification and degradation number being comprised in the metadata and associated with the data write-enabled RAID extent, the mapper being used to map a physical space and a virtual logical space, and the degradation number indicating the number of times that the disk slice comprised in the RAID extent changes from being normal to being degraded.

Abstract: Techniques manage a redundant array of independent disks. The techniques involve: in response to receiving a first command for assigning a first RAID stripe to a RAID group, storing metadata information of the first RAID stripe in a cache, the cache having different input/output (I/O) performance from the RAID; and storing the first command and the metadata information of the first RAID stripe in a predetermined storage space of the RAID in a sequential storage structure.

Abstract: Techniques manage a redundant array of independent disks. Such techniques involve: obtaining information on a wear level associated with each of a plurality of disks; selecting, based on the information on the wear level, a group of disks from the plurality of disks, a difference between the wear levels of any two of the group of disks being below a predetermined threshold; and creating a RAID with extents from the selected group of disks. Such techniques can sufficiently utilize the wear level to balance the data storage distribution among redundant arrays of independent disks, thereby enabling efficient management of redundant arrays of independent disks.

Abstract: Techniques providing I/O control involve: in response to receiving an I/O request, detecting a first set bits for a stripe in a RAID. The RAID is built on disk slices divided from disks. The stripes include extents. Each of the first set bits indicates whether a disk slice where a corresponding extent in the stripe is located is in a failure state. The techniques further involve determining, from the stripe and based on the first set bits, a first set of extents in the failure state and a second set of extents out of the failure state. The techniques further involve executing the I/O request on the second set of extents without executing the I/O request on the first set of extents. Such techniques can simplify storage bits in I/O control, support the degraded stripe write request for the RAID and enhance performance executing the I/O control.