Abstract: Various embodiments for managing data stored in a tiered data storage environment, by a processor device, are provided. A data file is proactively migrated from a lower tier to a higher tier of the tiered data storage environment by using a multidimensional algorithm adopting an actual frequency of access of the data file to gauge a slope of a predicted frequency of access of the data file. The data file is migrated from the lower tier to the higher tier only if each of a plurality of criteria of the multidimensional algorithm is satisfied.

Abstract: A controller of a data storage system reconfigures a target storage node within the data storage system including by assigning the target storage node a new target node name in place of a former target node name. The controller provides a reconfiguration notification, the former target node name, and the new target node name to a host platform having an ongoing first communication session with the target storage node. Following the reconfiguration notification, the controller responds to a login request of the host platform and establishes a new second communication session between the host platform and the target storage node. The host platform can logout of the now-stale first communication session after the second communication session is established.

Abstract: A computer-implemented method manages I/O queues in a host clustered system. The method includes, receiving, from a first virtual machine (VM), a request to establish a set of I/O queues in a storage system, and the first VM is supported by a first host. The method further includes, mapping a data volume to a target storage system, wherein the data volume is related to the request. The method includes, sending a first connection request from the first host to the target storage system. The method further includes, establishing, in response to the first connection request, a connection between the first host and the target storage system. The method incudes, blocking a second connection request, wherein the second connection request is directed to a second storage system, the second storage system being included in the storage system.

Abstract: A computer-implemented method manages I/O queues in a multi-tier storage system. The method includes identifying a set of subsystems in a multi-tier storage system, and each subsystem in the set of subsystems are communicatively connected to the storage system via a non-volatile memory express (NVMe) protocol and correlated to a tier of the multi-tier storage system. The method includes, determining a workload of each extent, wherein each extent of the set of extents are stored on one subsystem and the extents are accessed by an application. The method further includes, mapping, based on the workload of each extent, each extent to a core of the plurality of cores, wherein the mapping is configured to such that each core is balanced. The method includes, establishing, based on the mapping, an IOQ for each extent, wherein the IOQ is processed by the core to which it is mapped.

Abstract: A computer-implemented method to identify redundant Input/Output (I/O) queues in a multi-site storage system. The method includes receiving, from a host, by a backup storage system, a request to process a first set of Input/Output (I/O) queues, wherein the backup storage system is a second subsystem in a multi-site storage system. The method includes, allocating memory on the backup storage system. The method includes, identifying a second set of I/O queues established at a primary storage system, a first subsystem in the multi-site storage system. The method includes, determining the first set of I/O queues and the second set of I/O queues are redundant. The method includes, responsive to determining queues are redundant: notifying via the host, that the first set of the redundancy, terminating a connection between the host and the backup storage system, and de-allocating the memory to process the first set of I/O queues.

Abstract: Whether a replication relationship is established between a first and a second storage device is determined. If it is determined that the replication relationship is established between the first and second storage device, then whether data in the first region of the first storage device has changed since a previously completed asynchronous data replication process is determined. If the data in the first region of the first storage device has changed since the previously completed asynchronous data replication process, then whether the changed data in the first storage device is data copied from the second region of the first storage device is determined. If the changed data in the first region of the first storage device is data copied from the second region of the first storage device, then data from the second region of the second storage device is replicated to the first region of the second storage device.

Abstract: A computer-implemented method to identify redundant Input/Output (I/O) queues in a multi-site storage system. The method includes receiving, from a host, by a backup storage system, a request to process a first set of Input/Output (I/O) queues, wherein the backup storage system is a second subsystem in a multi-site storage system. The method includes, allocating memory on the backup storage system. The method includes, identifying a second set of I/O queues established at a primary storage system, a first subsystem in the multi-site storage system. The method includes, determining the first set of I/O queues and the second set of I/O queues are redundant. The method includes, responsive to determining queues are redundant: notifying via the host, that the first set of the redundancy, terminating a connection between the host and the backup storage system, and de-allocating the memory to process the first set of I/O queues.

Abstract: A computer-implemented method, according to one embodiment, includes initiating, by a computer, a connection with a storage controller. A determination is made, by the computer, if a number of compressed volumes on a target side present in a storage system comprising the storage controller. In response to determining at least one compressed volume, a number of queues are dedicated based on the number of compressed volumes. The number of dedicated queues are sent to the storage controller. Moreover, the number of dedicated queues are created. Compressed input/outputs (I/Os) are sent through at least one of the dedicated queues to at least one of the at least one compressed volume via the storage controller.

Abstract: Systems for synchronization of host and client log timestamps are provided. One system includes a timing module that acquires an initiator timestamp, wherein the initiator timestamp indicates a time on an initiating device associated with a computational activity performed between the initiating device and a receiving device. Additionally, the system includes a communication module that transmits the initiator timestamp to the receiving device. Also, the system includes a synchronization module that associates a receiver record of the computational activity on the receiving device with the initiator timestamp.

Abstract: A controller of a data storage system reconfigures a target storage node within the data storage system including by assigning the target storage node a new target node name in place of a former target node name. The controller provides a reconfiguration notification, the former target node name, and the new target node name to a host platform having an ongoing first communication session with the target storage node. Following the reconfiguration notification, the controller responds to a login request of the host platform and establishes a new second communication session between the host platform and the target storage node. The host platform can logout of the now-stale first communication session after the second communication session is established.

Abstract: A computer-implemented method according to one embodiment includes analyzing an image stored on a device. In response to determining that a storage consumption of the device is greater than a first predetermined threshold, content of the image that is both non-focused and that is not of interest is selectively compressed. In response to determining that the storage consumption subsequent to selectively compressing content of the image that is both non-focused and that is not of interest, is greater than a second predetermined threshold, content of the image that is both focused and that is not of interest is selectively compressed. In response to determining that the storage consumption subsequent to selectively compressing content of the image that is both focused and that is not of interest, is greater than the second predetermined threshold, content of the image that is both focused and that is of interest is selectively compressed.

Abstract: A computer-implemented method, according to one embodiment, includes: maintaining a heat map monitoring table on a per volume basis for a plurality of volumes which includes a heat count for each data block in the respective volume. The data blocks in a first volume which are depended on by one or more other volumes of the plurality of volumes are identified, the first volume being specified in a deletion request. Moreover, the identified data blocks and the corresponding heat counts are copied to the respective one or more other volumes.

Abstract: Disclosed is a computer implemented method to manage queue overlap in storage systems, the method comprising, identifying, by a storage system, a plurality of queues including a first queue and a second queue. The storage system includes a plurality of cores, including a first core and a second core, and wherein the first queue is associated with a first host and the second queue is associated with a second host. The method also comprises, determining the first queue and the second queue are being processed by the first core. The method further comprises, monitoring the workload of each cores and identifying a load imbalance, wherein the loam imbalance a difference between a first workload associated with the first core, and a second workload associated with the second core. The method also comprises, notifying the second host that the load imbalance is present.

Abstract: A command is received from a first computer. The command is to transfer a data from the first computer to a second computer. One or more ports of the second computer are determined that are available for the data transfer. A ranking is determined for the one or more ports. The first computer is notified of one or more data transfer ports of the one or more ports. The one or more data transfer ports are above a threshold in the determined ranking.

Abstract: Described herein are techniques for managing replication in a data storage environment. The techniques including selectively compressing and selectively encrypting, by a production site, a set of files for replication from the production site to a remote site. Files can be selectively compressed based on a compression ratio satisfying a compression threshold, and files can be selectively encrypted based on a file content satisfying an encryption criteria. The techniques can further include updating, by the production site, metadata associated with selectively compressed files and updating metadata associated with selectively encrypted files. The techniques can further include replicating the set of files for replication from the production site to the remote site, the set of files for replication including the selectively compressed and the selectively encrypted files.

Abstract: A first request may be received to write a first set of data to a first storage device of a first storage node. The first storage device may be capable of transferring or receiving data directly to or from a second storage device without transferring the data to or from a host device mapped to the first storage node. It may be determined that a first token clash check does not need to occur for the first request. The first token clash check may include determining whether the first request is requesting to write to one or more addresses that are associated with one or more tokens owned by one or more transactions. The one or more tokens may be a proxy for a set of data within one or more particular address ranges of the first storage device.

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: Methods and systems for storage network tiering are provided. One method includes receiving input/output (I/O) requests from a set of client devices via one of a plurality of communication paths and performing I/O operations on data in one or more storage devices based on corresponding I/O requests. The method further includes determining locations storing each data set in the one or more storage devices and transmitting, to the set of client devices, recommendations of a communication path in the plurality of communication paths for transmitting subsequent I/O requests that access a particular data set based on the location storing the particular data set. Systems and computer program products for performing the above method are also provided.

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: 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.