Emc Corporation

Emc IP Holding Company LLC

David Haase

Paul Thomas McGrath

Miles Aram De Forest

Michael D Haynes

Somnath A Gulve

Dennis Thomas Duprey

Dayanand Suldhal

Nagapraveen Veeravenkata Seela

Michael C Brundage

Alan Lee Taylor

Saurabh M Pathak

Charles Christopher Bailey

Robert F Goudreau

Walter A O'Brien, Iii

James Mark Holt

Michael Paul Wagner

Scott David Von Rhee

Walter Forrester

Timothy C Ng

Milind M Koli

Jackson Brandon Myers

Miles Aram DeForest

Samuel Mullis

Chetan Rameshchandra Vaidya

Dipak Prasad

Dean A Herington

Prabu Surendra

David W Harvey

Xuan Tang

Michael Lee Burriss

Samuel L Mullis, Ii

Dean D Throop

Utkarsh Vipul

Chung-Huy Chen

Peter E Tolvanen

Brandon Myers

Sriram Nagasubramanian

Vedashree Raman

Saurbh M Pathak

Varun K Chinta

Manish Patel

Vedashree Anantha Raman

Milind Koli

Miles A Deforest

Sheetal A Desai

Robert K Dewitt

Somnath A Gulye

Robert F Goudreau, Jr

A method is used in managing storage space in storage systems. Storage space reserved by a storage object from a set of storage tiers is evaluated. 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, storage space available and consumed in each storage tier of the set of storage tiers is determined.

Storage insurance and pool consumption management in tiered systems

A technique for copying a source data object within a data storage system to a destination includes ingesting data portions of the source object into respective pages of a cache. The cache associates the pages with respective descriptors and writes into the descriptors locations of storage elements that have been provided for storing the respective data portions at the destination. When later flushing these cache pages, each page is flushed to the location at the destination that is provided in the respective descriptor.

Efficient cloning and migration of data objects

A method is provided for performance by an I/O Coordination module of a computing device operating as a data storage system in order to obtain and process physical extent mappings in the context of an XCOPY Lite or XCOPY type operation. The method involves breaking down the source region into physical source extents with reference to a container filesystem representing the logical volume of the source as a file. The I/O Coordination module is then able to separately process each of these physical source extents and also obtain its corresponding physical destination extents with reference to the container filesystem, which also represents the logical volume of the destination as a file. The I/O Coordination module is then able to cause integrated copy commands to be issued to an underlying physical storage driver. An apparatus, system, and computer program product for performing a similar method are also provided.

Techniques for performing data storage copy operations in an integrated manner

A technique for managing file system expansions includes receiving a request to perform a file system expansion, the request specifying or implying an increase in size of a file system to a new target size. The request is received while a previous file system expansion is already in progress. The technique includes merging the previous file system expansion into the file system expansion specified by the request, to increase the size of the file system to the new target size.

Managing multiple file system expansions

There are disclosed techniques for use in managing data copying. In one embodiment, there is disclosed a method including a number of steps. The method comprises performing a first operation to copy data from a first region of a source area. The method also comprises determining a count relating to pending I/O requests in connection with a second region of the source area upon completion of the first operation. And, in response to determining that the count relating to pending I/O requests in connection with the second region of the source area equals zero, the method further comprises performing a second operation to copy data from the second region of the source area and configuring a new region in the source area to record a count relating to pending I/O requests in connection with the source area.

Method, data storage system and computer program product for managing data copying

A technique for use in managing data storage in a data storage system is disclosed. A first and second data storage commands (DSC) are received from a storage driver stack. Determining if the first DSC and the second DSC are both related aspects of a combined storage command and if so, establishing a pairing structure to pair the first DSC and the second DSC together. Fulfilling the combined storage command by fulfilling both the first DSC and the second DSC with reference to the pairing structure.

Technique for copying unallocated logical regions of thin logical units

A technique for managing copy sessions in a data storage system supports active and inactive copy-session states and reclaims memory for inactive copy sessions to reduce their memory footprints. When a copy session transitions from the active state to the inactive state, the copy session persists certain copy-progress data in non-volatile storage and frees structures in memory previously storing that copy-progress data. The inactive copy session continues to run but performs no copying and consumes less memory. When the copy session later transitions back to the active state, the copy session reads the copy-progress data back into memory and resumes copying.

Managing copy sessions in a data storage system to control resource consumption

A method includes (a) receiving a command to create an upper-deck filesystem of a specified size, the upper-deck filesystem residing within a logical volume expressed from a container file of a lower-deck filesystem, (b) provisioning a plurality of storage provisioning units (SPUs) from a storage pool of the data storage system to the container file in an order reflecting proximity of the SPUs within storage devices of the data storage system, the plurality of SPUs providing storage for the entire container file, and (c) subsequent to provisioning the plurality of SPUs to the container file, executing a plurality of threads in parallel to write metadata of the upper-deck filesystem to the plurality of SPUs, representing the upper-deck filesystem. Other embodiments are directed to a system, a computerized apparatus, and a computer program product for performing methods similar to that described above.

Coordination of file system creation to ensure more deterministic performance characteristics

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

An embodiment of a computer-implemented method for use in managing allocation of a storage pool in a data storage system by calculating an allocation mode for the storage pool based on a policy is described. Also described are embodiments of a system and computer program product enabled for carrying out such computer-implemented allocation management.

Calculating an allocation mode for a storage pool based on a policy

Methods, systems, and computer readable media for copy-on-demand optimization for large writes are disclosed. According to one aspect, a method for copy on demand optimization for large writes includes, in a system having a source data storage entity and a destination data storage entity, receiving a write request to write data to a target portion of the source data storage entity, the target portion of the source data storage entity comprising at least one data storage block. The method includes determining whether the source data storage entity and the destination data storage entity are engaged in a backup operation in which data sufficient to synchronize the source data storage entity to the destination data storage entity is copied from the destination data storage entity to the source data storage entity, and if so, determining whether the target portion of the source data storage entity is not yet synchronized to the destination data storage entity. If the target portion of the source data storage entity is not yet synchronized to the destination data storage entity, a copy-on-demand operation is performed to synchronize the target portion of the source data storage entity to the destination data storage entity, where each data storage block within the target portion of the source data storage entity that will be completely overwritten as a result of the write request is not synchronized to the destination data storage entity. The write request to write data to the target portion of the source data storage entity is then processed.

Systems, methods, and computer readable media for copy-on-demand optimization for large writes

A method is used for managing consistency groups in storage systems. A consistency group comprising multiple logical objects is created and multiple replicas of the consistency group are created. The consistency group is restored to one of the multiple replicas.

Restoring snapshots to consistency groups of mount points

A method, computer program product, and computing system for defining a first virtual object, wherein the first virtual object includes a first ready state indicator. At least a second virtual object is defined, wherein the at least a second virtual object includes at least a second ready state indicator. The first virtual object and the at least a second virtual object are grouped within a group virtual object.

System and method for object management

A storage system uses a block-level file system to manage physical storage of data blocks of logical units, the file system being mounted on an owning one of a set of storage processors. The storage processors redirect received storage requests to the owning storage processor, and periodically the amount of redirection is evaluated. If the amount of redirection is higher than a threshold, then the file system is dismounted at the owning storage processor and mounted at another storage processor to reduce the amount of redirection.

Storage system with dynamic transfer of block file system ownership for load balancing

A method, computer program product, and computing system for identifying a target storage device upon which a plurality of logical storage devices are to be defined. The target storage device includes a plurality of physical storage blocks. At least a first logical storage device and a second logical storage device are defined for mapping within the target storage device. Each of the first and second logical storage devices includes a plurality of logical storage slices. At least a portion of the logical storage slices for each of the first and second logical storage devices are non-sequentially mapped to at least a portion of the plurality of physical storage blocks included within the target storage device to generate an interlaced target storage device.

System and method for interleaving storage

Growing community of inventors

Fuquay Varina, NC, United States of America

David Haase