International Business Machines Corporation

Seagate Technology Incorporated

Douglas William Dewey

Kenneth Fairclough Day, Iii

Ian Davies

Kenneth F Day, Iii

Kenneth Wayne Boyd

Kevin Scott Goldsmith

Dean Lee Hanson

Michael David Barrell

Christopher Diebold O'Toole

James Lee Hafner

Brian Dennis McKean

Rodney Jerome Means

Donald Roman Humlicek

Wendy Ann Belluomini

Kirby Grant Dahman

David Allan Pease

William Griswold Sherman

Kevin Lee Kidney

Theresa Lynn Segura

Thomas George Wicklund

Thomas William Beglin

Ruiling Luo

William David Lamear

Daniel James Winarski

Gregory Tad Kishi

Shachar Fienblit

Thomas W Bish

Kamal Emile Dimitri

Brian D Hatfield

Mark Albert Reid

Ivan Ronald Olguin, Ii

Earle Ellsworth

Sangram Singh Ghoman

Gomathirajan Authoor Velayuthaperumal

Stephen S Huh

Jeffery Lawrence Shellhamer

Adam Thomas Wolinski

Ryan Phillips

Lawrence S Brown

Eddie Lin

Tharon Hall

William D Burke

Michael A Truty

William Mark Doumas

Norman Iwao Hanami

Barbara Ann McNaughton

Kenneth Fairclough

Kennth Fairclough Day, Iii

A method for mitigating the effects of malware is provided. The method includes determining a compressibility of a portion of data, determining a data corruption condition is satisfied based on the determined compressibility, and modifying a retention policy for retention of stored snapshots associated with the portion of data based on the satisfaction of the data corruption condition. The modifying of the retention policy includes generating a first snapshot associated with the portion of the data, prior to writing cached data associated with the portion of the data, writing the cached data associated with the portion of the data, and generating a second snapshot associated with the portion of the data, responsive to the deletion.

Malware mitigating storage controller

A data storage system can connect a data storage controller to a host and a data storage device. A first reference state corresponding to a first zone of the data storage device can be incremented in response to a first version of data being assigned to the first zone by the data storage controller. A second version of the data may be written to a second zone of the data storage device prior to populating a recently freed list with the first zone having an incorrect reference state. The first zone can be allocated by the data storage controller for new data without altering the incorrect reference state that is subsequently written to the first zone as directed by the data storage controller.

Data storage system with recently freed page reference state

Systems and methods are disclosed for multiple duration deduplication entries. A processor may be configured to perform data deduplication operations, including setting a first indicator for first metadata stored to a hash database identifying a first time interval to maintain the first metadata in the database, and setting a second indicator for second metadata stored to the database identifying a second time interval to maintain the second metadata in the database longer than the first time interval. The processor may remove the first metadata from the database when no duplicative data is detected for the first metadata within the first time interval, and remove the second metadata from the database when no duplicative data is detected for the second metadata within the second time interval.

Multiple duration deduplication entries

Method and apparatus for managing data in a distributed data storage system, such as but not limited to a cloud computing environment. In some embodiments, snapshots of a data set are uploaded from a source storage subsystem to a cloud store, along with intervening difference information volumes (DIVs). The DIVs are data structures that identify a set of updated data blocks that have been changed by the source storage subsystem between each successive pair of the snapshots. A reader subsystem requests and uses the latest DIV to request the latest set of changed data blocks from the cloud store, and uses the latest set of changed data blocks to update a previous snapshot to generate a copy of the most recent snapshot. The source and reader subsystems can comprise Internet of Things (IoT) devices, client devices, edge computing devices, etc. from different vendors and which utilize different protocols.

Delta information volumes to enable chained replication of data by uploading snapshots of data to cloud

A method includes identifying, using a controller, a first data error at a first data block stored in page metadata, the first data block having a first block logical ID. The method also includes identifying a second data block having the first block logical ID. The method also includes copying the second data block to the first data block based on the identified second data block.

Metadata recovery mechanism for page storage

Managing a redundant array of independent disks (RAID) storage array involves assigning first and second stripes to span respective first and second sets of disks. A subset of drives in the first set fails such that the first stripe is in a first state wherein a failure of another drive in the first set will lead to data loss in the first stripe. It is determined that the second stripe is in a fault-tolerant state such that the second stripe can have failures of two drives in the second set before the second stripe is in the first state, Part of an operational disk of the second set used by the second stripe is allocated to the first stripe to replace at least part of the subset of failed drives.

Allocating part of a raid stripe to repair a second raid stripe

A storage system periodically replicates data to another storage system for data backup and protection. The storage system is configured to detect an irregularity potentially causing a fault in the storage system. Such a detected irregularity may a component failure in a storage device, a temperature change in a storage device, etc. In response to the detected irregularity, the storage system increases a replication rate of data to the backup storage system.

Data replication in a storage system

An apparatus may include a controller configured search a hash database storing entries corresponding to hash values of previously stored data to find a hash page of the hash database corresponding to a range of hash values including the first hash value. When the hash page is found, the controller may be configured to determine whether the hash page does not include an entry for the first hash value, the first hash page further including a base hash value for the range of hash values. When the hash page does not include an entry for the first hash value, the controller may be configured to generate a first entry of the first hash page for the first hash value, the first entry including an offset value from the base hash value corresponding to the first hash value and a data location at which the received data is to be stored.

Deduplication database management

The technology disclosed herein includes a method for dividing a body of user data into a plurality of data blocks, and writing the plurality of data blocks into chunk zones in parallel streams, the chunk zones located in a first ordered pool of storage devices. In some implementations, the method includes adding additional storage devices to the first ordered pool making a second ordered pool, including the first ordered pool, and writing the plurality of data blocks across the second ordered pool of storage devices, such that each of the storage devices including spare capacity. The method includes determining if a storage device fails, and seeking data for the data blocks on the failed storage device from of the other storage devices.

Distributed RAID system

Systems and methods for replicating a snapshot of a volume are described. In one embodiment, a storage controller of a storage system may be operable to initialize a first replication process between a first storage volume of the first storage system and a second storage volume of a second storage system, copy content from a first system snapshot of the first storage volume to a second system snapshot of the first storage volume, and copy content from a first user snapshot of the first storage volume to the first system snapshot of the first storage volume. In some cases, a system snapshot is not accessible to a user and a user snapshot is accessible to the user. In some cases, at least one of the system snapshot and the user snapshot include a point in time capture of data on the first storage volume.

Snap tree arbitrary replication

Systems and methods for intelligent replication of a snapshot tree are described. In one embodiment, a first storage system may include a storage controller. In some embodiments, the storage controller may be operable to replicate a first storage volume of a first storage system and a first user snapshot of the first storage volume to a second storage volume of a second storage system and capture a first tree structure block (TSB) of the first storage system. In some cases, the first user snapshot may include a point in time capture of data on the first storage volume at a first time. In some embodiments, the first TSB captures a hierarchy of each snapshot of the first storage system.

Intelligent snapshot tree replication

A method of and system for managing spaces in memory of a storage facility is disclosed. The method and system includes storing first and second identifiers in first and second spaces in memory in response to allocating the second space for a set of data. The first identifier is stored in a first field within the first space. The first space has a pointer in a second field. The pointer in the second field indicates an address of the second space. The second identifier is stored within a portion of the second space. In response to an error event, the first and second identifiers may be captured. A determination is made as to whether the pointer is directed to the set of data. The determination is based on a comparison of the first identifier and the second identifier.

Managing spaces in memory

Growing community of inventors

Tucson, AZ, United States of America

Douglas William Dewey