Abstract: Embodiments of the present disclosure relate to methods and apparatuses for data copy. A method comprises receiving, from a client module in a first processing unit, a read request for reading data from a first storage region. The method further comprises, in response to determining from the read request that the data is to be copied, obtaining, from a cache, a first bitmap associated with the first storage region, the first bitmap indicating if the first storage region is filled with zero. The method further comprises, in response to determining from the first bitmap that the first storage region is filled with zero, sending, to the client module, an indication that the data is zero.

Abstract: 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. Accordingly, there is improved performance of the dual-processor storage system.

Abstract: Techniques manage a storage system. In accordance with such techniques, an access request for target data is received; a storage position of the target data is determined, the storage position indicating one of a storage device and a cache; a target element corresponding to the target data is determined from a first replacement list and a second replacement list associated with the first replacement list based on the storage position, the first replacement list including at least a counting element, the counting element indicating an access count of data in the storage device, the second replacement list including a low-frequency access element, the low-frequency access element indicating a cache page with a low access frequency in the cache; and a position of the target element in a replacement list where the target element exist is updated. Therefore, the overall performance of the storage system can be improved.

Abstract: Techniques manage addresses in a storage system. In such techniques, an address page of an address pointing to target data in the storage system is determined in response to receiving an access request for accessing data in the storage system. A transaction for managing the address page is generated on the basis of the address page, here the transaction at least comprises an indicator of the address page and a state of the transaction. A counter describing how many times the address page is referenced is set. The transaction is executed at a control node of the storage system on the basis of the counter. With such techniques, the access speed for addresses in the storage system can be accelerated, and then the overall response speed of the storage system can be increased.

Abstract: Techniques for managing a storage system involve: determining a size of a data information indicating area in the storage system, the data information indicating area indicating content information related to a slice group including multiple slices, the slice group being the smallest data granularity for storage processor access associated with the storage system; determining a correspondence between the size of the data information indicating area and a size of the slice group; and determining, based on the size of the data information indicating area and the correspondence, the size of the slice group. Accordingly, bandwidth of a communication message interface which interconnects storage processors and is utilized heavily by system components can be saved. Additionally, cross-storage processor message communication for access to data information indicating area from input and output paths can be eliminated.

Abstract: A method for the adsorption separation of propylene and propyne, comprising selectively adsorbing propyne from a mixed gas of propylene and propyne using an anion-containing metal-organic framework material as an adsorbing agent so as to obtain a purified propylene gas. The anion-containing metal-organic framework material is used as an adsorbing agent in the method, and the adsorbing agent is a kind of highly ordered microporous organic-inorganic hybrid material, with the pore size thereof being adjustable within the range of 0.4-1.2 nm, and the pore volume thereof being adjustable within the range of 0.1-1.2 cm3/g. A large number of anionic active sites and a highly ordered spatial arrangement thereof allow the adsorbing agent to exhibit excellent propyne adsorption properties. Thus, the adsorbing agent has a very high propyne selectivity and adsorption volume.

Abstract: A method, computer program product, and computer system for receiving, by a computing device, a write I/O to a storage device array coupled to a cache, wherein the write I/O may be received from a host. A cache miss in the cache may be determined for the write I/O. One or more free pages may be allocated at an address in the cache to store data for the write I/O. The address in the cache to store the data may be sent to a hostside portion of a software stack in the storage device array. The data may be written directly from the hostside portion to the cache at the address.

Abstract: Embodiments of the present disclosure provide a cache system and associated method. The cache system includes a first pipeline module including a first plurality of sequential processing phases for executing a plurality of operations. The first plurality of operations is executed in response to Input/Output (I/O) requests of a first plurality of types for the persistent storage device, and each of the first plurality of operations is a common operation for the I/O requests of at least two of the first plurality of types. The cache system also includes a control module configured to: determine a first type of a first pending processing I/O request for the persistent storage device, and in response to the first type being one of the first plurality of types, cause the first pipeline module to be executed to process the first pending processing I/O request.

Abstract: A storage management technique involves: receiving a request for creating a virtual volume, the request at least indicating a size and a service level of the virtual volume; in response to the request, creating the virtual volume on a first storage device; storing metadata information of the virtual volume in a local database that is accessible to the first storage device, the metadata information at least comprising identification information of the virtual volume and identification information of the first storage device; and synchronizing the metadata information to at least one second storage device. Such a technique enables more flexible creation of virtual volumes on a cluster of storage device.

Abstract: Embodiments of the present disclosure provide a method for managing a storage system, an apparatus and a computer readable storage medium. The method comprises: determining a permitted concurrency number for respective access to multiple storage devices in the storage system by a multi-level cache device of the storage system, the permitted concurrency number being associated with a state of the multiple storage devices; in response to receiving an access request for the storage system, determining a cache device in the multi-level cache device corresponding to the access request; determining whether a current concurrency number of access to the multiple storage devices in the cache device reaches the permitted concurrency number; and in response to determining that the current concurrency number fails to reach the permitted concurrency number, executing the access request for the storage system.

Abstract: A method, computer program product, and computer system for receiving, by a computing device, an I/O request, wherein the I/O request may include host I/O priority information. It may be determined that the I/O request is associated with a token bucket of a plurality of token buckets based upon, at least in part, the host I/O priority information. If the token bucket of the plurality of token buckets has sufficient tokens for the I/O request, the I/O request may be sent down a block stack for processing, and if the token bucket of the plurality of token buckets has insufficient tokens for the I/O request, the I/O request may be rejected.

Abstract: Embodiments of the present disclosure relate to a method and device for flushing pages from a solid-state storage device. Specifically, the present disclosure discloses a method of flushing pages from a solid-state storage device comprising: determining a first number based on a period length of one flushing cycle and a period length required for building one flushing transaction, the first number indicating a maximum number of flushing transactions that can be built in the flushing cycle; and flushing pages from the solid-state storage device with an upper limit of the first number in the flushing cycle. The present disclosure also discloses a device for flushing pages from a solid-state storage device and a computer program product for implementing steps of a method of flushing pages from a solid-state storage device.

Abstract: Various embodiments of the present disclosure generally relate to a fault processing method, system and computer program product. Specifically, the method may comprise determining a plurality of devices to be detected and corresponding device attributes. The method may also comprise performing a first fault detection for the plurality of devices based on the device attributes, the first fault detection being based on a first fault diagnosis rule that is generic for the plurality of devices. Besides, the method may also comprise: in response to a first device in the plurality of devices being determined to have a fault in the first fault detection, performing a first fault processing to the first device, the first fault processing being based on a first fault processing rule that is generic for the plurality of devices.

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 involve writing to a disk array. In response to a request for writing target data to a target storage area in a stripe of the disk array including at least one failed storage area, it is determined whether incompletion of the writing of the target data is to cause failed data in the at least one failed storage area to be unrecoverable. In response to determining that the incompletion of the writing is to cause failed data to be unrecoverable, the failed data is recovered. The recovered data is stored in a persistent memory, and the target data is written in the target storage area. In this way, the efficiency and performance of writing processing of the disk array having a failed disk is increased significantly.

Abstract: Techniques recognize reducible contents in data to be written. The techniques involve receiving information related to data to be written, the information indicating that the data to be written comprises reducible contents, the reducible contents comprising data with a first reduction pattern. The techniques further involve recognizing the reducible contents in the data to be written based on the information. The techniques further involve reducing the reducible contents based on the first reduction pattern. With such techniques, active I/O pattern recognition with communication between applications and storage devices may be accomplished. In addition, with such techniques, it is easy/simple to expand recognizable new patterns, and I/O pattern limitations in standard approaches no longer exist.

Abstract: A storage system is associated with at least one part of multiple storage devices in a resource pool, a part of a storage space in a storage device being inaccessible to the storage system. Techniques involve: identifying an extent within the part of the storage space in the storage device as a free extent; selecting a group of storage devices each with a free extent from the multiple storage devices in response to determining a virtual address range in the storage system as specified by an access request is inaccessible; mapping the virtual address range to a physical address range of the free extents in the group of storage devices; and allocating a storage space specified by the physical address range to the storage system. Therefore, the expansion of the resource pool can be implemented more conveniently and rapidly, and performance of the storage system can be improved.

Abstract: Techniques perform storage management. Such techniques involve, in response to an operation to be performed on data in a cache page, determining a first cache page reference corresponding to the cache page, the first cache page reference comprising a pointer value indicating the cache page. Such techniques further involve creating, based on the first cache page reference and the operation, a second cache page reference corresponding to the cache page, the second cache page reference comprising the pointer value. Such techniques further involve performing the operation on the data in the cache page via the second cache page reference. One cache page can correspond to a plurality of cache page references. Additionally, copy of data from one cache page to a further cache page can be effectively avoided, so as to enhance input/output performance and utilization rate of storage space.

Abstract: Techniques involve: in response to a number of errors of an error type in a storage disk increasing, determining an adjustment rate for a health value of the storage disk based on a total usage time length of the storage disk, where a longer total usage time length corresponds to a higher adjustment rate, and the health value indicates a health condition of the storage disk with respect to the error type. The techniques further involve increasing the adjustment rate based on a total input/output (I/O) number of the storage disk, where a greater total number of I/Os corresponds to a greater increment. The techniques further involve adjusting the health value with the adjustment rate. Such techniques can improve the accuracy of evaluating the health condition of the storage disk.

Abstract: Various techniques manage a storage system. Such techniques involve: in response to detecting that a first request of a plurality of requests initiated for a bulk request is completed, determining a response time length for the first request, the bulk request being used to migrate data from a first storage device to a second storage device, each request of the plurality of requests being used to read data from the first storage device and write data to the second storage device; determining an average response time length of the completed requests of the plurality of requests based at least in part on the response time length for the first request; and updating the number of the plurality of requests initiated for the bulk request based on the average response time length.