International Business Machines Corporation

Alex Dicks

Miles Mulholland

Eric John Bartlett

Dominic Tomkins

A method, system, and computer program product for managing a storage array in a storage system, the storage array comprising a first and second data blocks comprising: receiving a set of cryptographic values from the storage array, the set comprising a first value associated with the first data block, and a second value associated with the second data block; analysing the set of cryptographic values to determine a set of associations, the set of associations comprising a first association between the first data block and the second data block, storing the set of associations; and in response to determining the set of associations, performing a storage management operation on at least one of the first data block and the second data block.

Drive cryptographic value management

A method, computer program product, and computer system for full allocation volume to deduplication volume migration in a storage system. The method includes moving a physical allocation of stored data associated with a full allocation volume into a virtual address range in a deduplication domain and setting up the deduplication metadata to be a passthrough. The method then performs a background deduplication process on the virtual address range once populated with the physical allocations using a drive query hash interface to perform hash calculations on physical drives at which the data is stored.

Full allocation volume to deduplication volume migration in a storage system

Method and system for partitioning of deduplication domains in storage systems. The method includes constructing a data structure having multiple nodes representing data chunks and edges between the nodes representing a weighting of deduplication references between the data chunks, and performing clustering of the nodes of the data structure to split the nodes into clusters of tightly related nodes based on the weightings of the edges. The data chunks represented by a cluster of nodes are migrated to a deduplication domain to restrict deduplication to between only the data chunks in the deduplication domain.

Partitioning of deduplication domains in storage systems

A method, computer system, and a computer program product for providing backend deduplication awareness at a virtualizing layer is disclosed. The present invention may include receiving a deduplication information from a backend storage controller associated with performing an input/output (IO) operation to a physical address of a disk. The present invention may include translating the physical address to a logical address to apply to a plurality of storage extents in a virtualizing layer. The present invention may include constructing a graph including corresponding nodes representing the plurality of storage extents and including corresponding deduplication edge weights representing a plurality of deduplications between the plurality of storage extents. The present invention may include identifying at least one subgraph within the constructed graph, wherein the identified at least one subgraph represents a storage extent cluster that is suitable for garbage collection as a cluster.

Backend deduplication awareness

A data recovery method recovers corrupted data after a disaster event in a storage facility operating with deduplication in which copies of data are maintained between volumes through a copy services relationship. The deduplication operates with referencing domains, each having a source grain containing a reference pointing to a location where data is stored and referrers pointing to the source. The data recovery method identifies any source that is pointing to data which is corrupt and then establishes whether a copy services relationship exists between the referencing domain of the source with corrupted data and another referencing domain, in which case the other referencing domain will have a copy of the corrupted data. Provided that the copy is valid, it is written across to replace the corrupted data. The method allows corrupted source data to be recovered without having to perform a full resync or restore.

Data recovery mechanisms in deduplication-enabled storage facilities

Concepts for remote storage of data are presented. Once such concept is a system comprising: a primary storage controller; and a secondary storage controller of a remote data storage system. The primary storage controller is configured to determine a service characteristic of data storage to or data retrieval from the remote data storage system and to communicate service performance signals to the secondary storage controller based on the determined service characteristic. The secondary storage controller is configured to receive service performance signals from the primary storage controller, to compare the received service performance signals with a service requirement so as to determine a service comparison result, and to control data storage to or data retrieval from the remote data storage system based on the service comparison result.

Remote data storage

Method and system are provided for managing capacity in a storage system using copy services. The method is a computer-implemented method that predicts an imminent event due to a constrained resource and identifies one or more copy service relationship that will mitigate the imminent event. The method orchestrates a partial or full invalidation of a copy service relationship to reclaim some of the constrained resource to prevent the imminent event, including updating the copy service relationship metadata to indicate the invalidation.

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Winchester, United Kingdom

Alex Dicks