International Business Machines Corporation

Globalfoundries Inc.

Gordon Douglas Hutchison

Lee Jason Sanders

John Paul Agombar

Ian Boden

Ben Sasson

Bruce J Smith

Miles Mulholland

Alan B Dawson

Adam J Pilkington

Graham Castree Charters

Gareth Paul Jones

Cameron James Mcallister

Alastair Cooper

Joseph R Winchester

Matthew B White

Jonathan W L Short

Daniel S Critchley

David Geoffrey Screen

James P Hodgson

Timothy J Mitchell

Paul Jonathan Quelch

Lucy Amanda Raw

Tim Mitchell

Lucy A Harris

Fenghui Jiang

Ashley Robertson

Benjamin A Confino

William James Scales

Amanda Elizabeth Chessell

Thomas A Evans

Maurice Francis Gray

Peter John Schommer

Charlie James Redlin

Iain A Bethune

Sarah Gray

Jonathan M Parkes

Nolan Rogers

Barry Douglas Whyte

Christopher B E Beeken

Robert Howard High, Jr

Adrian David Dick

Matthew Francis Peters

Richard Nigel Chamberlain

Thomas James Freund

Martin Mulholland

Florent Rostagni

Joseph Kuruvilla Chacko

Alexander Henry Ainscow

Richard Daniel Foster

Kathryn Sarah Warr

Geoffrey S Pirie

Malcolm David Ayres

Brian David Peacock

Andrew Simon Clement

Andrew James Frederick Bravery

William Smith

Clive Richard Kates

Emma Louise Shepherd

Andrew John Huff

Toby Corbin

Edward Altenburger

Bruce James Smith

Method and system are provided for recycling container storage objects at a storage controller. The method includes receiving a create operation of a new container by an orchestrator, including information indicating a purpose of the container, and associating a label with the new container, with the label indicating the orchestrator-defined information. The method includes checking labels of soft-deleted container objects for a suitable match with the label of the new container, where soft-deleted container objects are logical objects for deleted containers that are maintained for recycling. The method includes recycling metadata of a matched soft-deleted container object for the new container. The method includes checking received input/output operations for the new container against already stored data of the matched soft-deleted container to recycle data and skip writes where they match.

Recycling container storage objects at a storage controller

In a service mesh, back-pressure is applied and relieved as needed by a control mechanism which is applied between pairs of services to control the rate at which service requests are made from one of service to the other via monitoring hardware and/or software metrics. A proxy of one service is monitored to observe the rate at which it receives service requests from the other service. If it is observed that the monitored metrics have breached allowable limits, back-pressure is applied to reduce the rate at which the other proxy transmits these service requests. Through continued monitoring of the proxy, the back-pressure can be later relieved when appropriate by increasing the permitted request rate.

Managing workload in a service mesh

Aspects of the present invention disclose a method, computer program product, and system for stale data recovery using virtual storage metadata. The method includes one or more processors generating a primary virtual storage metadata structure having virtual address areas for a data chunk. Each area includes a plurality of most recent updates of metadata for the data chunk. The metadata of each update includes a sequence number for the update and a pointer to the physical location of the data. The method further includes one or more processors generating an overflow virtual storage metadata structure for multiple virtual address areas. The overflow metadata structure includes updates that have overflowed from the virtual address areas. In addition, wherein an oldest update in a full virtual address area of the primary virtual storage metadata structure includes a link to an overflow location.

Stale data recovery using virtual storage metadata

Described are techniques for managing data locations of derived storage objects. The techniques include accessing a primary metadata tree providing a lookup path using a virtual address to locate data for a primary object in physical storage pointed to by a leaf node of the primary metadata tree and providing a sub-tree from a leaf node of the primary metadata tree associated with the primary object, the sub-tree providing lookup paths using virtual addresses for derived objects. Wherein a derived object is a view of the primary object at a specific point in time, with copy leaf nodes of the sub-tree pointing to stored data of the derived objects. The techniques further include maintaining an ancestry graph associated with the sub-tree with the ancestry graph linking derived object identifiers to provide an ancestral chain lookup to identify derived object identifiers of the closest stored physical data of a derived object.

Managing locations of derived storage objects

A method, computer system, and a computer program product for storing a write data in a storage system that operates using a log-structured filing system is provided. The present invention may include compressing a write data. The present invention may also include identifying a region of a storage system based on a first size of the compressed write data. The present invention may further include the storage system operating using a log-structured filing system. The present invention may also include a different region of the storage system having a different compression ratio. The present invention may further include writing the compressed write data in the identified region of the storage system.

Storing write data in a storage system

Method, apparatus, and computer program product utilizing a hot-spare node in a storage network having a deduplication fingerprints database. A plurality of nodes is provided in the storage network including at least one active node and at least one hot-spare node. A portion of the deduplication fingerprints database is stored on each active node and on each hot-spare node. Data from the deduplication fingerprints database is provided from at least one of said at least one hot-spare node during normal operation. Responsive to a failure of one of said at least one active node, a portion of the deduplication fingerprints database associated with data stored on the failed one of said at least one active node is retained on one of the at least one hot-spare node. The failed one active node is replaced with one of the at least one hot-spare node.

Utilizing spare network nodes for deduplication fingerprints database

A cache storage system indexing method is provided that indexes a data address in a cache storage system based on a data fingerprint of the cached data, wherein the data fingerprint is generated by a deduplication fingerprint function used for referencing deduplication of data in the cache storage system. A computer-implemented method of data operations to a cache storage system is also provided including: obtaining a data fingerprint for the data of the data operation, either by applying a deduplication fingerprinting function to data of a write operation or by accessing deduplication metadata for a read operation to obtain the data fingerprint generated by using a deduplication fingerprinting function used for deduplication of data in the cache storage system; and using an indexing service to the cache storage system having an address schema based on the data fingerprints of the data.

Cache indexing using data addresses based on data fingerprints

A computer system hosting (micro)services that uses a service mesh to govern communication between the services. The services include consumer services and an event stream service, the latter directing an event stream from a producer service to the individual consumer services. The control plane of the service mesh has the role of creating and removing service instances. Based on a specified event capacity that is to be provided by the consumer services collectively, the control plane manages service provisioning by estimating the current event capacity of the system. This is done by measuring the event capacities of each consumer service instance and summing them, from which any shortfall or excess of the current event capacity in relation to the specified event capacity can be determined. Consumer service instances are then added in case of a shortfall or removed in case of an excess as needed to avoid over or under-provisioning.

Dynamic load balancing in reactive systems

An apparatus for improved version updates in data deduplication includes a baseline module that stores a baseline referrer link in a first cohort of baseline referrer links pointing to a first location in storage where a baseline version data block is stored. The apparatus includes a signpost module that stores to metadata a signpost that points to an updated referrer link in a second cohort of updated referrer links that points to a second location in the deduplicating storage device where an updated version data block is stored in response to the updated version data block being generated. The apparatus includes a cohort update module that replaces the baseline referrer link with the updated referrer link in response to determining that an additional updated version data block matches the updated version data block pointed to by the signpost. A method and a system implement functions of the apparatus.

Cohort management for version updates in data deduplication

A data storage system configured to deduplicate and store sets of data is presented. The system comprises a computer readable storage device configured to store a plurality of sets of data for a plurality of hosts, wherein each sets of data of the plurality of sets of data corresponding to each host of the plurality of hosts is encrypted with one or more different encryption keys, and wherein at least one of the plurality of sets of data contains deduplicated data. The system also comprises a key translator configured to create at least one translation key based, at least in part, on the one or more different encryption keys and the deduplicated data, and wherein the at least one translation key is configured to translate from a first encryption key to a second encryption key of the one or more different encryption keys.

Deduplication of encrypted data

A computer-implemented method, system, and computer program product for analyzing readability of a communication intended for a target audience includes: analyzing the communication to determine a first readability measure associated with the communication; determining a second readability measure associated with the target audience based on one or more historical communications previously transmitted or received by the target audience; and generating a readability feedback signal for the communication based on the first readability measure and the second readability measure.

Analyzing readability of communications

An apparatus for dynamically adjusting a journal snapshot window is disclosed. A computer-implemented method and computer program product also perform the functions of the apparatus. According to an embodiment of the present invention, a failure detection module detects a potential failure of at least a portion of a non-volatile storage device. The non-volatile storage device includes a journal for tracking metadata changes for data that is stored on the non-volatile storage device prior to committing the metadata changes to metadata for the non-volatile storage device. A notification receiving module receives an indication of the potential failure of the non-volatile storage device. A snapshot module adjusts a snapshot window for the journal in response to the indication of the potential failure. The snapshot window includes a set of metadata changes in the journal that have not been committed to the metadata of the non-volatile storage device.

Dynamically adjusting a journal snapshot window

A method and a system are provided for controlling deduplication in a storage pool. The method includes creating one or more deduplication domains within a storage pool, wherein storage volumes that are within a deduplication domain are deduplicated only with other volumes within the same deduplication domain and assigning storage volumes to a deduplication domain in order to control deduplication between storage volumes. The method may include, within a deduplication domain, blocklisting a volume from deduplication with a specified volume whilst allowing deduplication with other volumes in the deduplication domain.

Controlling deduplication in a storage pool

A method and apparatus are provided for printing multicolored three-dimensional objects. The method includes: selectively exposing a photosensitive thermoplastic feedstock to light within an extrusion nozzle, the feedstock comprising a thermoplastic base mixed with a photosensitive material; extruding the exposed feedstock into a deposit to print an object; and photo-chemically developing the deposit to provide color to the deposit. An apparatus is provided for three-dimensional printing with an extrusion nozzle including a light exposing component for selectively exposing the photosensitive thermoplastic feedstock to light within the extrusion nozzle.

Printing multicolored three-dimensional products

Mechanisms are provided for cabling a set of enclosures. Using a set of cables that comprises eight physical layers (PHYs), the set of enclosures are coupled together such that: for a first enclosure and each intermediate enclosure in the set of enclosures, at least four PHYs of the eight PHYs terminate within a Serial Attached Small Computer System Interface (SCSI) (SAS) expander of the first enclosure and a SAS expander of each intermediate enclosure white passing through a remaining four PHYs of the eight PHYs without connecting to the respective SAS expander; and, for a last enclosure in the set of enclosures, all of the eight PHYs terminate in the SAS expander of the last enclosure.

Cabling a set of enclosures

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Hampshire, United Kingdom

Gordon Douglas Hutchison