Systems and methods for replicating data from a first site to a second site remote from said first site are described. An embodiment includes storing compressed data on a hard disk appliance, reading said data without decompressing said data, sending said data over a wide-area-network (WAN) in a compressed state, and storing said data on a second hard disk appliance remote from said first hard disk appliance in its compressed state without performing an additional compression operation.

Techniques for performing data movements may include tracking sets of I/O statistics for a extents, wherein each of the sets of I/O statistics characterizes I/O operations directed to a corresponding one of the extents having data stored on a first storage tier of first non-volatile storage devices; determining, in accordance with the sets of I/O statistics, a list that includes one or more of the extents qualified for promotion from the first storage tier to a second storage tier, wherein the second storage tier includes second non-volatile storage devices have a higher performance ranking that the first non-volatile storage devices of the first storage tier; selecting, from the list, a first extent to be promoted from the first storage tier to the second storage tier; and performing first processing that promotes only cached data of the first extent from the first storage tier to the second storage tier.

A total estimated occupancy value of a first data on a first data block of a plurality of data blocks is determined. To determine the total estimated occupancy value of the first data block, a total block power-on-time (POT) value of the first data block is determined. Then, a scaling factor is applied to the total block POT value to determine the total estimated occupancy value of the first data block. Whether the total estimated occupancy value of the first data block satisfies a threshold criterion is determined. Responsive to determining that the total estimated occupancy value of the first data block satisfies the threshold criterion, data stored at the first data block is relocated to a second data block of the plurality of data blocks.

A command to transfer data in a portion of a memory component to a recovery portion of a different memory component is received from a host system, wherein the portion of the memory component is associated with a portion of the memory component that has failed, and the data in the portion of the memory component is recovered and transferred to the recovery portion of the different memory component without moving or processing the data through the host system responsive to receipt of the command.

A partition function is transferred from a source system to a multi-tenant target environment. The transfer is executed from a source system to a multi-tenant target environment. Physical and logical input/output (I/O) configuration settings of a partition image are separated on the source system, moving logical I/O configuration settings from the source system to a remote multi-tenant target environment. A dedicated target system of the remote multi-tenant target environment is selected. Physical information about hardware and connections of the dedicated target system are added to the logical I/O configuration settings. The logical I/O configuration settings combined with the physical information in the target system are activated. An operating system with the activated logical I/O configuration is started such that the partition function is transferred.

A method includes receiving data for storage and encoding the data to produce a plurality of data slices. Metadata is determined for a data slice of the plurality of data slices. The metadata is stored in a metadata storage tree. The metadata storage tree is stored via a first plurality of memory devices of a first memory type. The data slice is stored in a slice storage location in a second plurality of memory devices of a second memory type. The slice storage location is indicated by the metadata. The first memory type has a higher performance level than the second memory type based on a utilization approach.

Calculating storage consumption in a storage-as-a-service model, including: identifying a data object stored in a pool of storage resources, wherein the pool of storage resources are accessible by a plurality of entities and the data object occupies an amount of storage capacity within the pool of storage resources; attributing to each entity a fractional portion of the amount of storage capacity occupied by the data object; and calculating, in dependence upon the fractional portion of the amount of storage capacity occupied by the data object and attributed to a particular entity, a storage cost for the particular entity.

Method and apparatus for managing memory includes collocating electronic persistent memory along with a primary memory on a memory module. The electronic persistent memory and the primary memory may communicate via a module local bus comprising a plurality of memory channels. A data migration protocol may be used over a memory channel of the plurality of memory channels to copy data from the electronic persistent memory to the primary memory, and the data may be accessed from the primary memory. The combination of electronic persistent memory and primary memory (e.g. DRAM) in a single memory module with module local bus having a device controller running firmware is one implementation of storage class memory (SCM).

Disk based emulation of tape libraries is provided with features that allow easier management and administration of a backup system and also allow increased flexibility to both archive data on tape at a remote location and also have fast restore access to archived data files. Features include automatic emulation of physical libraries, and the retention and write protection of virtual tapes that correspond to exported physical tapes.

Embodiments of the present disclosure relate to methods, devices and computer program products for writing data in a disk array in a storage system. The storage system comprises a disk array. The method comprises: in response to receiving a write request to write new data to a data block in at least one disk array group in a degraded mode within a disk array, reading old data stored in the data block and old parity information stored in a parity block associated with the data block. The method further comprises: determining new parity information associated with the new data based on the old data, the old parity information and the new data. The method further comprises: writing the new data and the new parity information into at least one cache page provided by a cache component in the storage system, the at least one cache page being allocated in a persistent memory in the cache component. In addition, this method further comprises: flushing the new data and the new parity information into the data block and the parity block in the at least one disk array group, respectively.