Abstract: Provided are a computer program product, device, system, and method for write data management. In one embodiment, a write management controller calculates an order for writing data and parity blocks of write data code words on tape media in a variable interleaved fashion which ensures a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word. The calculated write order information may be provided back to a host or other data source so that the write data is eventually transmitted to the tape drive for writing on tape media in accordance with the calculated write order. In this manner, a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word may be achieved to increase the reliability of the data storage.

Abstract: A computer-implemented method and a related tape library system for controlling an operation of a tape library system comprising at least one magnetic-tape drive unit and a plurality of tape cartridges, wherein the operation of the tape library system comprises a usage optimization of available resources of the tape library system, is disclosed. The method comprises determining a load value of the resources of the tape library system, accumulating requests to a tape cartridge in a batch before using tape library system to physically accessing the tape cartridge, and dynamically adjusting a number of requests in the batch before physically accessing the tape cartridge dependent on the load value such that a response time of the tape library system is optimized.

Abstract: A computer-implemented method and a related tape library system for controlling an operation of a tape library system comprising at least one magnetic-tape drive unit and a plurality of tape cartridges, wherein the operation of the tape library system comprises a usage optimization of available resources of the tape library system, is disclosed. The method comprises determining a load value of the resources of the tape library system, accumulating requests to a tape cartridge in a batch before using tape library system to physically accessing the tape cartridge, and dynamically adjusting a number of requests in the batch before physically accessing the tape cartridge dependent on the load value such that a response time of the tape library system is optimized.

Abstract: Technology for choosing a design for a computer data storage system having a prescribed reliability. The selection of a “matching storage system,” matching the prescribed reliability is based on computation of first and second reliability indicators.

Abstract: A storage system and a method for storing a data segment, a storage capacity manager and a method for managing a capacity of a storage unit, and a storage tier relocation manager and a method for relocating a data segment. The storage system includes at least two storage tiers, an access pattern evaluator, a classification unit, a selector, and logic. The storage capacitor manager includes a monitoring unit and capacity managing unit. The storage tier relocation manager includes a target storage tier, the data segment relocated to the target storage tier, and a protection measure.

Abstract: A computer-implemented method for managing a tiered storage system having an archive tier and an active storage tier comprises determining a workload for moving data between the active tier and the archive tier; and determining an assignment of data to be stored across the active tier and the archive tier, based on the determined workload.

Abstract: An embodiment is directed to a method for determining an assignment of data to be stored on at least one storage tier i of a plurality of storage tiers of a tiered storage system. The method including, for the at least one storage tier i, steps of accessing storage device characteristics of the at least one storage tier i of the plurality; based on the accessed storage device characteristics, splitting the at least one storage tier i into Ni storage subtiers of the at least one storage tier i, the Ni storage subtiers having respective storage device characteristics; and based on characteristics of data to be stored on the tiered storage system and the respective storage device characteristics of the Ni storage subtiers, determining an assignment of data to be stored on each of the Ni storage subtiers. Embodiments are directed to related methods, systems and computer program products.

Abstract: A method for storing a data segment in a storage tier of a storage unit comprising at least two storage tiers includes receiving the data segment to be stored including metadata; receiving metadata of data segments stored in the storage unit; and determining the storage tier to store the received data segment to and a protection level dependent on the metadata received and dependent on the metadata of the received data segment.

Abstract: A device and method for determining number of storage devices for each of plurality of storage tiers and assignment of data to be stored in the plurality of storage tiers. The device computes an optimized number of storage devices for each tier including a classifier, which receives units as input data to be stored in the system. Based on the characteristics of the storage devices, the device outputs a data-unit-to-storage tier assignment. An optimizer receives data-unit-to-storage tier assignment from the classifier and a cost budget for the system. Thereafter, an output for the number of storage devices for each storage tier is calculated. A method for determining number of storage devices for each of a plurality of storage tiers and assignment of data to be stored in the plurality of storage tiers are also provided.

Abstract: A computer-implemented method for managing a tiered storage system having an archive tier and an active storage tier comprises determining a workload for moving data between the active tier and the archive tier; and determining an assignment of data to be stored across the active tier and the archive tier, based on the determined workload.

Abstract: A storage system and a method for storing a data segment, a storage capacity manager and a method for managing a capacity of a storage unit, and a storage tier relocation manager and a method for relocating a data segment. The storage system includes at least two storage tiers, an access pattern evaluator, a classification unit, a selector, and logic. The storage capacitor manager includes a monitoring unit and capacity managing unit. The storage tier relocation manager includes a target storage tier, the data segment relocated to the target storage tier, and a protection measure.

Abstract: An embodiment is directed to a method for determining an assignment of data to be stored on at least one storage tier i of a plurality of storage tiers of a tiered storage system. The method including, for the at least one storage tier i, steps of accessing storage device characteristics of the at least one storage tier i of the plurality; based on the accessed storage device characteristics, splitting the at least one storage tier i into Ni storage subtiers of the at least one storage tier i, the Ni storage subtiers having respective storage device characteristics; and based on characteristics of data to be stored on the tiered storage system and the respective storage device characteristics of the Ni storage subtiers, determining an assignment of data to be stored on each of the Ni storage subtiers. Embodiments are directed to related methods, systems and computer program products.

Abstract: Embodiments include methods for operating a first storage system having a first number of data storage drives for enabling access to a first set of removable media. Aspects include providing a second storage system having a number K of data storage drives for enabling access to a second set of removable media and providing a set of parameters describing operational characteristics of the second storage system. Aspects also include determining an analytical model using the set of parameters, the analytical model describing the variation of average waiting time as a function of system load over a predefined range covering multiple system load regime domains and determining values of the set of parameters using the analytical model and data of the second storage system. Aspects further include using the analytical model and the values of the set of parameters for reconfiguring the first storage system.

Abstract: A storage system is proposed which comprises a data storage device including a number N of removable storage media for storing data, with N?2, and a number m of drives, with m?1, wherein each of the m drives is configured to drive one of the removable storage media mounted to the drive. The storage system includes a server being coupled to the data storage device and configured to serve requests from clients, and a controller which is configured to control the data storage device to adaptively unmount the removable storage media based on a monitoring information of the requests at the data storage device, states of the drives, and states of the removable storage media.

Abstract: A method is provided for increasing data storage reliability in a heterogeneous storage system including multiple storage devices of different types. The devices store respective data subsets of a dataset. The method includes accessing configuration parameters for the dataset including first and second amounts of the data subsets respectively stored on the multiple storage devices. The method further includes estimating an initial global reliability of the heterogeneous storage system for the dataset, based on the configuration parameters. The method also includes determining an increased global reliability of the storage system for the dataset, by estimating a global reliability as would be obtained by modifying at least some of the configuration parameters, whereby at least the first and second amounts of the data subsets respectively stored on the devices are modified.

Abstract: A computing device writes data across storage devices in an erasure-coded system. The computing device computes data blocks and parity blocks from data and computes a portion of the data to be stored in the system. The computing is performed by one or more controllers included in a redundant array of an independent disks controller. The computing device provides the locations of the data blocks and the parity blocks in storage devices of an erasure-coded system. The location is determined using one or more placement nodes. The placement nodes are configured for managing placement schemes of data blocks and parity blocks on the storage devices.

Abstract: A storage system is proposed which comprises a data storage device including a number N of removable storage media for storing data, with N?2, and a number m of drives, with m?1, wherein each of the m drives is configured to drive one of the removable storage media mounted to the drive. The storage system includes a server being coupled to the data storage device and configured to serve requests from clients, and a controller which is configured to control the data storage device to adaptively unmount the removable storage media based on a monitoring information of the requests at the data storage device, states of the drives, and states of the removable storage media.

Abstract: Embodiments include methods for operating a first storage system having a first number of data storage drives for enabling access to a first set of removable media. Aspects include providing a second storage system having a number K of data storage drives for enabling access to a second set of removable media and providing a set of parameters describing operational characteristics of the second storage system. Aspects also include determining an analytical model using the set of parameters, the analytical model describing the variation of average waiting time as a function of system load over a predefined range covering multiple system load regime domains and determining values of the set of parameters using the analytical model and data of the second storage system. Aspects further include using the analytical model and the values of the set of parameters for reconfiguring the first storage system.

Abstract: Machines, systems and methods for optimizing data replication in a distributed storage network, the method comprising determining a need to create a replica for a data item in a remote failure zone in a data storage network; creating a temporary replica of the data item in a local failure zone defined in the data storage network, in response to determining that it is beneficial to create the temporary replica in the local failure zone based on a cost versus reliability improvement analysis; attempting to create the replica in the remote failure zone; and removing the temporary replica from the local failure zone, in response to successfully creating the replica in the remote failure zone.

Abstract: A method is provided for increasing data storage reliability in a heterogeneous storage system including multiple storage devices of two or more different types, the devices storing respective data subsets of a dataset.