Abstract: An application programming interface (API) is used to migrate, from a specified source LUN to a specified target LUN, at least one specified sub-LUN data chunk, the API functioning as an interface between a storage controller and an owning application.

Abstract: A source code-based specification is implemented for use as an interface between a storage controller and an owning application to migrate a specified size of data from physical storage behind the LUN to a new physical location.

Abstract: An application programming interface (API), functioning as an interface between a storage controller and an owning application, is used to migrate, from a specified source LUN to a specified target LUN, at least one specified sub-LUN data chunk, the at least one specified sub-LUN data chunk having a predefined chunk size fixed by the storage controller. A specified total migration size is incrementally reduced by each completed migration of the at least one specified sub-LUN data chunk until the total migration size is zero and the migration is completed.

Abstract: A method, computer program product, and a computer system are disclosed for isolating data to one or more storage pools receive a packet from a host; determine whether the packet contains virtual extensible local area network (VXLAN) information; extract, in response to determining that the packet contains VXLAN information, a network identifier from the packet; determine one or more storage pools that correspond to the extracted network identifier; and store data from the packet in the one or more determined storage pools.

Abstract: A source code-based specification is implemented for use as an interface between a storage controller and an owning application to migrate a specified size of data from physical storage behind the LUN to a new physical location.

Abstract: A computer-implemented method according to one embodiment includes establishing, by an initiator, a discovery session type. A request is sent by the initiator for identifying a target. The request includes an identity key value pair that specifies at least one target identity, and a target characteristic key value pair that specifies a target characteristic. A response is received by the initiator from a target matching the key value pairs. The response includes path information of the target. In response to receiving the response the target is connected to by the initiator using the path information. A computer program product for establishing a connection between an initiator and a target according to one embodiment includes a computer readable storage medium having program instructions embodied therewith. The program instructions are readable and/or executable by an initiator to cause the initiator to perform the foregoing method.

Abstract: An embodiment of the invention may include a method, computer program product and computer system for data recovery for use with a computing device. The embodiment may determine an amount of time to transfer a first file from a first location, on a first device, to a second location, on a second device. The embodiment may include receiving historical operational information associated with the first device and the second device. The embodiment may create a transfer model correlating the amount of time to transfer the first file with the historical operational information associated with each device. The embodiment may determine an estimated amount of time to transfer a second file based on the transfer model and a current operational information about each device. The embodiment may determine whether the estimated amount of time to transfer a second file is above a first threshold amount.

Abstract: Various embodiments for preserving data redundancy in a data deduplication system in a computing environment are provided. A write command is received for writing a selected data segment to a physical storage location. A determination is made as to whether the write command includes an indicator including at least one of a bit and a flag, the indicator designating that the selected data segment must not be subject to a deduplication operation. An indicator is configured by providing a system call with an extended attribute indicating that the selected data segment must be written to physical memory notwithstanding the selected data segment matching data written to the physical memory earlier in time.

Abstract: A mechanism is provided in a data processing system for asynchronous replication. The mechanism creates a record in a write log in a host computing device for a write command and marking the record as uncommitted. The mechanism maintains a copy of data to be written by the write command at the host computing device. The mechanism issues the write command from the host computing device to a primary storage controller at the primary storage site. Responsive to receiving an acknowledgement from the primary storage controller that the data have been written to the primary storage site, the mechanism marks the record as unreplicated. Responsive to receiving an acknowledgement from the primary storage controller that the data have been replicated to a secondary storage site, the mechanism erases the record in the write log and deleting the copy of data.

Abstract: A computer-implemented method according to one embodiment includes classifying an image stored on a device as a type of image. A user's access pattern of other images also classified as the type of image is analyzed. The method further includes analyzing at least one sharing medium that the user has previously used to share the image and/or other images. The analyzing the at least one medium is at least in part based on the classified type of the image. A previously recorded delete pattern of the user is analyzed. The analyzing the previously recorded delete pattern of the user is at least in part based on the classified type of the image. Based on the classified type of the image and/or based on results of the analyses, the image is categorized to one of a plurality of image compression categories. Each category corresponds to a degree of image compression.

Abstract: A computing system includes a computer in communication with a tiered storage system. The computing system identifies a set of data transferring to a storage tier within the storage system. The computing system identifies a program to which the data set is allocated and determines to increase or reduce resources of the computer allocated to the program, based on the set of data transferring to the storage tier. The computing system discontinues transferring the set of data to the storage tier if a resource allocated to the program cannot be increased.

Abstract: Embodiments for improving Input/Output (I/O) performance through bi-directional bandwidth feedback optimization in a distributed computing environment. Resource allocation information from a host is retrieved by an application plugin. Bandwidth allocation information is retrieved from a network switch using Enhanced Transmission Selection (ETS) by the application plugin. A bandwidth optimization operation is performed on the host and/or on the network switch according to the resource allocation information received from the host and the bandwidth allocation information received from the network switch by the application plugin.

Abstract: Embodiments for improving Input/Output (I/O) performance through bi-directional bandwidth feedback optimization in a distributed computing environment. Resource allocation information from a host is retrieved by an application plugin. Bandwidth allocation information is retrieved from a network switch using Enhanced Transmission Selection (ETS) by the application plugin. A bandwidth optimization operation is performed on the host and/or on the network switch according to the resource allocation information received from the host and the bandwidth allocation information received from the network switch by the application plugin.

Abstract: Methods and systems for enhanced performance during reduced network functioning are provided. A system may include a path detection module that detects a path change in a plurality of paths, the plurality of paths communicatively couple a host device to a plurality of volumes. Further, the data is replicated from a pre-change primary volume in the plurality of volumes to a post-change primary volume in the plurality of volumes. The system also includes a replication direction module that switches a direction of replication in response to the detected path change. Additionally, the data is replicated from the post-change primary volume to the pre-change primary volume in response to the detected path change. The system further includes an activity module that determines an activity level associated with one or more extents and arranges the one or more extents on the post-change primary volume in response to the detected path change.

Abstract: A computing system includes a computer in communication with a tiered storage system. The computing system identifies a set of data transferring to a storage tier within the storage system. The computing system identifies a program to which the data set is allocated and determines to increase or reduce resources of the computer allocated to the program, based on the set of data transferring to the storage tier. The computing system discontinues transferring the set of data to the storage tier if a resource allocated to the program cannot be increased.

Abstract: Embodiments for optimizing sequential write operations in a data deduplication environment by one or more processors. Similar data deduplication signatures for stored data at all storage devices in one or more storage systems may be maintained. A deduplication signature associated with a write operation at a storage device may be compared to the similar data deduplication signatures. Results of the comparison with each of the other storage devices may be shared prior to performing the write operation.

Abstract: A method, computer system, and a computer program product for calculating bandwidth requirements is provided. The present invention may include receiving a recovery point objective (RPO). The present invention may also include simulating, using a virtual disk, a set of inter-site data transfers between a first data storage controller and a second data storage controller, wherein the second data storage controller is modelled by the virtual disk. The present invention may then include collecting a set of data correlating to a set of bandwidth factors, based on the simulated set of inter-site data transfers. The present invention may further include calculating, using the virtual disk, a bandwidth required for data replication for disaster recovery, based, at least in part, on the set of bandwidth factors and the RPO.

Abstract: A data storage system includes multiple tiers of data storage accessible by multiple hosts. The multiple tiers include an upper tier having a lower access latency and a lower tier having a higher access latency. For each extent among a plurality of extents of file system objects in the data storage, the storage controller separately tracks, for each of one or more hosts that access the extent, a respective heat indicative of a frequency of access by that host. In response to an event disassociating a first host among the multiple hosts from a particular extent among the plurality of extents, the storage controller recalculates an overall heat of the particular extent while excluding a first heat of the first host for the particular extent. The storage controller migrates extents among the multiple tiers based on overall heats of the plurality of extents.

Abstract: A computer program product, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith. The computer readable storage medium is not a transitory signal per se. Moreover, the program instructions are readable and/or executable by a controller to cause the controller to perform a method which includes: receiving a same input/output request along more than one communication paths, and evaluating a workload associated with each of the communication paths. A communication path having a lowest workload associated therewith is selected. Moreover, information corresponding to the input/output request as well as a status are sent along the selected communication path. The status sent indicates that the selected communication path was chosen to satisfy the input/output request. A special status indicating that none of the remaining communication paths were chosen to satisfy the input/output request is also sent along each of the remaining communication paths.

Abstract: A computer program product, according to one embodiment, includes a computer readable storage medium having program instructions embodied therewith. The computer readable storage medium is not a transitory signal per se. Moreover, the program instructions are readable and/or executable by a controller to cause the controller to perform a method which includes: receiving a same input/output request along more than one communication paths, and evaluating a workload associated with each of the communication paths. A communication path having a lowest workload associated therewith is selected. Moreover, information corresponding to the input/output request as well as a status are sent along the selected communication path. The status sent indicates that the selected communication path was chosen to satisfy the input/output request. A special status indicating that none of the remaining communication paths were chosen to satisfy the input/output request is also sent along each of the remaining communication paths.