Abstract: A method, computer program product, and computer system for receiving, by a computing device, a request to create a heterogeneous storage object. A first storage object of the heterogeneous storage object may be created with a first RAID type. A second storage object of the heterogeneous storage object may be created with a second RAID type. The heterogeneous storage object may be persisted to a data store.

Abstract: Techniques for storage management involve determining an independent redundant disk array RAID associated with a first set of storage disks, a first portion of storage blocks corresponding to the RAID being located in the first set of storage disks; determining, from the first set of storage disks, a plurality of storage disks corresponding to the RAID; and updating a set of association degrees of the first set of storage disks to indicate data coupling between storage disk pairs in the plurality of storage disks. Accordingly, the data coupling degree between storage disks can be determined more accurately.

Abstract: Techniques manage a cache. Such techniques involve creating a primary cache by a cache management module in a storage system. Such techniques further involve: in response to the primary cache being created, sending a first request to a hardware management module to obtain first information about a first virtual disk. Such techniques further involve: in response to receiving the first information from the hardware management module, creating a secondary cache using the first virtual disk. Such techniques further involve: in response to an available capacity of the primary cache being below a predetermined threshold, flushing at least one cache page in the primary cache to the secondary cache. In certain techniques, it is possible to use spare extents in the disk array to create the secondary cache to increase a total capacity of the cache in the system, thereby improving the access performance of the system.

Abstract: Embodiments of the present disclosure relate to method and apparatus for scaling out storage devices, and scaled-out storage devices by establishing a cross-device link between a first storage device and a second storage device; exchanging configuration information of at least one of the first storage device and the second storage via the cross-device link; creating, in the first storage device, a shadow object corresponding to a real object in the second storage device; and creating, in the second storage device, a shadow object corresponding to a real object in the first storage device; wherein each shadow object can expose feature and/or state of a corresponding real object to users without implementing a functioning logic of the corresponding real object.

Abstract: 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.

Abstract: Techniques for storage management involve: determining expected usage time of a first storage disk in a set of storage disks, at least a part of the set of storage disks being configured to form at least one redundant array of independent disks (RAID); moving data in a first storage block, associated with a first RAID in the at least one RAID, in the first storage disk to a second storage block in a second storage disk in the set of storage disks based on a determination that the expected usage time is less than a predetermined threshold value; and replacing the first storage block with the second storage block, so that the second storage block is associated with the first RAID. Based on this manner, the stability of a storage system can be improved.

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 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: The techniques involve, in response to receiving a message indicating that a failure occurs in a first disk group of an array, selecting, from lists in a cache, a first entry to be written into the array, the lists including first and second lists, wherein the first list is used to cache a data entry for the first disk group. The techniques further involve, in response to determining that the first entry comes from the first list, writing the first entry into the array; in response to determining that the first entry comes from the second list and the first entry is to be written into the first disk group, moving the first entry from the second list to the first list; and in response to determining that the first entry is to be written into the second disk group, writing the first entry into the second disk group.

Abstract: Techniques manage tracking records in an application system which includes an active dump file and an inactive dump file. A set of tracking records indicating a state of the application system is received. The set of tracking records is added to the active dump file. A storage signal for storing the active dump file into a backup device associated with the application system is generated according to a determination that a size of the active dump file meets a predetermined size threshold and according to a determination that a state of the inactive dump file is a ready state. The ready state indicates that the inactive dump file is available for storing another set of tracking records to be received in the future. Accordingly, two dump files may alternately store tracking records, and copies of the dump files may be continuously stored into a backup device to improve reliability.

Abstract: Techniques manage redundant arrays of independent drives (RAID). The techniques involve: in response to a target stripe to be built in the RAID, determining, from a resource pool, whether there are spare extents associated with at least one system disk. The techniques further involve: in response to determining that there are spare extents associated with at least one system disk, determining an adjacent relationship of used extents associated with the at least one system disk within a RAID stripe. The techniques further involve: determining, based on the adjacent relationship and the spare extents, an extent for building the target stripe. Accordingly, the total number of the RAID stripes including extents associated with the system disks can be reduced significantly, and a balance can be achieved within spare extents associated with system disks and spare extents associated with user disks for building a RAID stripe.

Abstract: Embodiments of the present disclosure provide method, device and computer program product for managing a storage system. The storage system includes a disk having a plurality of extents. The method comprises obtaining metadata associated with an RAID stripe in a first RAID of a first type, the first RAID including at least a part of extents from the plurality of extents. The method also comprises allocating an additional extent to the RAID stripe. The method further comprises converting, based on the allocated additional extent and by modifying the metadata, the first RAID of the first type into a second RAID of a second type in a degraded mode. Additionally, the method comprises initiating, based on the modified metadata, a rebuilding process for the second RAID, so as to convert the second RAID from the degraded mode to a normal mode.

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 involve: determining, according to a determination that a performance level of a target storage unit is lower than a threshold level, whether idle disk slices that can be used for reconstructing malfunctioning disk slices in the target storage unit exist in a slice pool; determining a priority of the target storage unit according to a determination that the idle disk slices do not exist; and selecting replacing disk slices for reconstructing the malfunctioning disk slices from available storage units based at least in part on the priority, wherein the available storage units have performance levels not lower than the threshold level. In this way, data loss due to the off-line of storage units is prevented; and meanwhile, the performance of the entire storage system can be globally stabilized.

Abstract: Techniques manage a storage system. The techniques involve: in response to a first control unit of the storage system receiving an access request to a target storage area in the storage system, determining whether the target storage area is located in a first storage area or a second storage area; in response to the target storage area being located in the second set of storage areas, determining that a second control unit of the storage system processes the access request, the first control unit and the second control unit sharing the storage system; and updating an access state of the first control unit to the target storage area, the access state indicating access permission for the target storage area included in the first control unit. Such techniques can effectively reduce the number of CMI messages related to a stripe lock mechanism in a dual active SP.

Abstract: Storage management techniques involve determining a set of association degrees associated with a set of storage disks, the set of storage disks forming a set of Redundant Arrays of Independent Disks (RAIDs), and an association degree of the set of association degrees indicating a coupling degree of a pair of storage disks in the set of storage disks, the coupling degree being determined based on a number of RAIDs associated with the pair of storage disks. Such techniques further involve determining a first number of pairs of storage disks, wherein the coupling degree of each pair of storage disks is less than a predetermined coupling threshold; and in response to determining that a ratio of the first number to a total number of pairs of storage disks of the set of storage disks is greater than a predetermined ratio threshold, reorganizing at least one RAID in the set of RAIDs.

Abstract: The present disclosure provides a storage management method, a device and a computer-readable medium. The method comprises: receiving a request for creating a storage space, the request at least comprising a storage capacity and a RAID configuration of the storage space, the RAID configuration at least indicating a RAID type; allocating an extent based on the storage capacity; creating a RAID group for the extent based on the RAID type; and storing metadata of the RAID group in the extent, the metadata indicating a configuration of the RAID group and a configuration of a user data region in the extent.

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 manage a storage system. In such techniques, data types of data in multiple storage devices associated with the storage system are obtained. The multiple storage devices are divided into a first group of storage devices and a second group of storage devices according to the data types. A first processing ability of the first group of storage devices and a second processing ability of the second group of storage devices are determined separately. Data distribution is scheduled among the multiple storage devices on the basis of the first processing ability and the second processing ability. With such techniques, processing abilities of various storage devices in a resource pool may be balanced, so that workloads of various storage devices may be balanced and further overall response speed of the resource pool may be increased.

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.