Emc Corporation

Emc IP Holding Company LLC

Dennis Thomas Duprey

David Haase

Xiangping Chen

Michael D Haynes

Miles Aram De Forest

Jean-Pierre Bono

Philippe Armangau

Walter A O'Brien, Iii

Karl M Owen

Somnath A Gulve

Dean D Throop

Paul Thomas McGrath

Mark K Ku

David W Harvey

Thomas Earl Linnell

Qin Tao

Alan Lee Taylor

Christopher Alan Seibel

Monica Chaudhary

Khang Can

Assaf Natanzon

William C Davenport

Roy E Clark

Leehod Baruch

Nagapraveen Veeravenkata Seela

Matthew H Long

Charles Christopher Bailey

Dayanand Suldhal

Robert F Goudreau

Samuel Mullis

Scott David Von Rhee

Jehuda Shemer

Scott E Joyce

Himabindu Tummala

Madhav Mutalik

Xiaoye Jiang

Bruce Rabe

Michael Lee Burriss

Yingchao Zhou

Michael C Brundage

James Mark Holt

Yaming Kuang

Eric R Vook

Michael Paul Wagner

Natasha Gaurav

Miles Aram DeForest

Saurabh M Pathak

Chung-Huy Chen

Victor T Kan

Derek Scott

J Brandon Myers

Jeffrey Lucovsky

Binbin Liu Lin

Guillermo Roa

Earle MacHardy

Changxin Liu

Mayank Ajmera

Kenneth John Hayman

Earle T Machardy, Jr

Robert F Goudreau, Jr

C Christopher Bailey

Abhijit Aswath

A method of protecting a filesystem against metadata corruption while maintaining high performance is provided. The method includes (a) receiving a storage command directing a computing device to store a block of file data to the filesystem and (b) in response: (1) writing the block to a data portion spanning a set of drives using a single-fault tolerant level of RAID, wherein writing the block includes performing exactly two write operations to the set of drives; and (2) writing filesystem metadata associated with the block to a metadata portion spanning a subset of the set of drives using a double-fault tolerant data redundancy scheme different than the single-fault tolerant level of RAID, the subset including at least three drives, the data and metadata portions being non-overlapping, wherein writing the metadata includes performing at least three write operations to the subset of the set of drives.

Techniques for optimizing metadata resiliency and performance

Described are techniques for use in connection with providing data protection. A storage resource for which data protection is provided by a data protection service may be identified. One or more criteria may be specified denoting one or more trigger conditions for providing data protection by the data protection service, wherein, responsive to an occurrence of any of the one or more trigger conditions, first processing may be performed by the data protection service to protect the storage resource. The one or more criteria may include a first criterion identifying a first amount of data change that has to occur with respect to the storage resource. Notification may be received regarding an occurrence of a first of the one or more trigger conditions. Responsive to receiving the notification, the first processing may be performed by the data protection service.

Data protection based on data changed

A technique for managing temporal data placement in data storage systems is disclosed. An application program interface (API) is provided, where a host application is configured to communicate sub-LUN data segment location, application configuration tiering, and timing parameter information to the API. The sub-LUN data segment location, application configuration tiering, and timing parameter information is transmitted to the data storage system via an out-of-band communications path. The sub-LUN data segment location, application configuration tiering, and timing parameter information is received at the data storage system and associated with the corresponding LUN. A timing estimate for implementing sub-LUN data segment relocation is generated based on system derived tiering information and recent relocation timing information. Relocation of the sub-LUN data segment is scheduled such that the sub-LUN data segment is relocated to a tier corresponding to the application configuration tiering information during the time period associated with the timing parameter.

Managing time scheduled data placement in data storage systems

A method is used in managing data placement in storage systems. A portion of an allocated storage space is identified in a data storage system for managing data placement. The allocated storage space includes first and second set of slices. The first set of slices associated with the portion of the allocated storage space in the data storage system is identified. Data of the first set of slices is transferred to the second set of slices of the allocated storage space in the data storage system. The first set of slice is removed from the allocated storage space in the data storage system.

Managing data placement in storage systems

A method is used in managing reclaiming storage space in file systems. Characteristics of a file system and a data service executing upon the file system are evaluated. Based on the evaluation, reclamation of storage space from the file system is affected based on a set of policies.

Managing reclaiming storage space in file systems

A technique for replicating a file from a source data storage system (source) to a destination data storage system (destination) includes receiving, by the destination from the source, (i) file data for multiple logical extents of the file and (ii) respective tiering metadata for those logical extents. The destination selects, based on the tiering metadata, one or more storage tiers available on the destination. The destination updates a local replica of the file by placing the logical extents on the selected tier or tiers.

Storage tiering in replication target based on logical extents

Described are techniques for migrating data. A source data storage system includes a source device and a target data storage system includes a target device. A passive path and an active path are provided for a host to access data of a logical device. The host recognizes the passive path and the active path as paths to the logical device. The passive path is between the host and the source data storage system. The active path is between the host and the target data storage system and used in connection with proxying at least some requests directed to the logical device received from the host through the target data storage system while migrating data for the logical device from the source device to the target device. Migrating is performed to migrate data for the logical device from the source device to the target device. Migrating is controlled by a migration module executing on the target data storage system that copies data from the source device to the target device.

Data migration techniques

A method includes receiving a copy command, by a primary data storage device, to copy a data portion stored on the primary data storage device to another location on the primary data storage device; determining, with a mirroring module, whether a local copy of the data portion is stored on a secondary data storage device and whether the another location on the primary data storage device is mirrored by the secondary data storage device, the secondary data storage device at least partially mirroring the primary data storage device; and if the local copy of the data portion is stored on the secondary data storage device and the another location is mirrored by the secondary data storage device, sending a second command to the secondary data storage device to copy the local copy of the data portion to another location on the secondary data storage device.

Methods computer readable media, and systems for copying data between mirrored systems

A method is used in managing data in a data storage system. A tiered storage pool is identified wherein the storage pool includes multiple tiers having multiple storage units. A wear indicator for each of the multiple storage units is monitored. A first storage unit having a wear indicator greater than a second storage unit is identified. High activity data on the first storage unit is also identified. The identified high activity data is migrated from the first storage unit to the second storage unit.

Managing data placement based on flash drive wear level

A method is used in managing accesses to storage. An amount of data storage space in use by a mapped logical volume and RAID group characteristics of a storage pool used by the mapped logical volume are determined. Based on the amount and the RAID group characteristics, a report of storage resources corresponding to the mapped logical volume is produced. Based on the report, accesses to the mapped logical volume are controlled.

Managing accesses to storage

A method is used in managing data activity information for data migration in data storage systems. Slice activity data for slices stored in a data storage system is identified. The slice activity data is divided into multiple subsets of slice activity data. A subset of slice activity data may be obtained and stored in working memory. The slice activity data may be updated to correspond to changes slice activity. After a determined time, the updated slice activity data is copied to a disk drive and the method is repeated with the next subset of slice activity data.

Managing data activity information for data migration in data storage systems

Techniques for processing requests are described. A first thread is selected for execution. Only a single thread is allowed to execute at a time. Each thread is associated with a queue of requests to be processed by the thread. A first request is selected from the queue of first thread that performs first processing to service the first request. A service time classification for the first request is determined in accordance with criteria that includes a runtime determination of what resource(s) are used in servicing the first request. It is determined, in accordance with the service time classification, whether to allow the first thread to continue execution and process a second request from the queue of the first thread. If the first thread is allowed to continue execution, second processing is performed by the first thread to service the second request. Otherwise, a second thread is selected for execution.

Using request service time as fairness heuristic in locking techniques

A method and a system for use in managing tiering in a cache-based system is disclosed wherein the cache-based system comprises a first data storage tier and a second data storage tier configured such that the performance characteristics associated with one of the tiers is superior to the performance characteristics associated with the other tier. In at least one embodiment the method and system comprises collecting a first set of I/O activity data for at least one data unit located in a cache, wherein the at least one data unit is associated with a data group located on the first data storage tier; collecting a second set of I/O activity data for the data group located on the first data storage tier; analyzing the first and second set of I/O activity data; and based on the analysis and the performance characteristics associated with the second data storage tier, determining whether the data group should be migrated to the second data storage tier.

Managing tiering in cache-based systems

A method, computer program product, and computing system for defining a master slice pool within a backend storage array of a storage system. The master slice pool includes a plurality of data storage slices. A first portion of the plurality of data storage slices is assigned to a first frontend system included within the storage system, thus defining a first frontend slice pool. One or more data storage slices included within the first frontend slice pool are allocated to one or more storage objects associated with the first frontend system. A quantity of unused data storage slices included within the first frontend slice pool is determined. The quantity of unused data storage slices is adjusted based upon a target slice level.

Scalable distributed slice broker

A method is used in managing data deduplication in storage systems based on storage space characteristics. Characteristics of first and second storage tiers are evaluated. A first data object resides on the first storage tier and a second data object resides on the second storage tier. The first and second data objects are selected for applying a deduplicating technique. A data storage system includes the first and second storage tiers configured such that performance characteristics associated with the first storage tier is different from the second storage tier. Based on the evaluation, the deduplicating technique is applied to the first and second data objects.

Managing data deduplication in storage systems based on storage space characteristics

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Raleigh, NC, United States of America

Dennis Thomas Duprey