Hewlett-Packard Development Company, L.p.

Hewlett Packard Enterprise Development LP

Emc Corporation

Ibrix, Inc.

Boris Zuckerman

Sudhir Srinivasan

Vitaly M Oratovsky

Douglas L Voigt

Manny Ye

Dinesh Venkatesh

Steven Orszag

Robert Lee Rappaport

Kevin J Shea

Shaji O John

Xiaoye Jiang

Russ William Herrell

Suparna Bhattacharya

Andrew Christopher Walton

Bret Alan McKee

Uresh K Vahalia

Jeffrey Jon Darcy

Andrew Ray Wheeler

Greg Astfalk

Yevgeniy Dashevsky

Philip Eric Jackson

Irina P Slutsky

Arkadi L Litvin

Harold Woods

Alexander Epstein

Milan Shetti

Benjamin Levin

Ronald Curtis Searls

Alex Osinsky

Douglas L Voight

A plurality of mapping modes may be shifted between in real time while maintaining continuous memory mapped access to an application. Data may be migrated between different types storage devices and/or interconnects. The shift between the plurality of mapping modes may be based on a change to the type storage device and/or type of interconnect for the data migration.

Mapping mode shift between mapping modes that provides continuous application access to storage, wherein address range is remapped between said modes during data migration and said address range is also utilized bypass through instructions for direct access

A storage system includes a distributed file system. An attribute of a particular entity in the file system relates to a snapshot. In response to an operation in the storage system, it is determined whether the snapshot attribute is to be propagated to another entity of the file system.

Propagating a snapshot attribute in a distributed file system

Example implementations relate to a storage memory direct access (SMDA) provider. The SMDA provider may pin a storage memory region to a memory address of a consumer machine, the storage memory region corresponding to a storage range of a storage device requested by the consumer machine. The SMDA provider may atomically commit data in the storage memory region accessed by the consumer machine via the memory address.

Storage memory direct access

According to an example, PM controller based atomicity assurance may include receiving data that is related to an application for storage in a PM. PM controller based atomicity assurance may further include receiving an indication of an atomic transaction that is related to the data, and receiving an indication to generate a CP that is related to the atomic transaction. The CP may be generated in a PM staging area. A determination may be made as to whether the CP in the PM staging area is closed or open. In response to a determination that the CP in the PM staging area is closed, content related to the CP may be propagated to the PM.

Persistent memory controller based atomicity assurance

A unifying memory controller (UMC) to send and receive data to and from a local host. The UMC also may manage data placement and retrieval by using an address mapper. The UMC may also selectively provide power to a plurality of memory locations. The UMC may also manage data placement based on a policy that can make use of a property stored in the metadata storage location. The property may be a property describing the data that is being managed. The UMC also may use its own local cache that may store copies of data managed by the circuit.

Unifying memory controller

A technique includes receiving a query to a directory in a file system. In response to the query, both information targeted by the query and additional information are retrieved in anticipation of another query for the additional information.

Anticipatorily retrieving information in response to a query of a directory

A technique includes receiving a request to restore a state of a file system. The request defines a rollback period, which extends from a restoration time that is specified by the request to a time at which the request was made. The technique includes reconstructing a state of the file system in response to a query using a preserved snapshot of the file system. The reconstruction including reconstructing the state at an arbitrary query time based at least in part on a dynamically inheritable attribute of an entity stored on the file system and the rollback period.

Reconstructing a state of a file system using a preserved snapshot

A first file server for use with a distributed-file system includes a processor configured to determine that an incoming file system communication is associated with a first portion of the distributed-file system associated with a second file server, send a first authorization request to the second file server to request authorization to directly access the first portion of the distributed-file system, analyze a first authorization response from the second file server to determine at least one storage location associated with the first portion of the distributed-file system, determine that an incoming second authorization request received from a third file server is associated with a second portion of the distributed-file system associated with the first file server, obtain data indicative of the second portion of the distributed-file system, and send a second authorization response that includes the data.

Independent data access in a segmented file system

A file server is provided for use in an association of devices that implements a distributed-file system, the association of devices including file servers that each are configured to control separate segments of the distributed-file system. The file server includes a memory interface configured to communicate with a memory storing at least one of the segments of the distributed file system, and a processor coupled to the memory interface and configured to: identify a file system object that resides on a first segment in the distributed file system and that is directly pointed to by a first remote ancestor directory that resides on a second segment separate from the first segment; and store a first shadow tree entry in a selected segment other than the second segment, the first shadow tree entry providing a pointer to the file system object and being disposed in a shadow tree, where the first shadow tree entry provides an alternative to the first remote ancestor directory to access the file system object in the distributed file system.

Shadow directory structure in a distributed segmented file system

An exemplary embodiment of the present invention provides a method of processing a file system transaction in a distributed file system. The method includes receiving a transaction request from a computer, wherein the transaction request includes file data to be stored and a first segment identifier that determines a destination of the file data. The method also includes generating a first distributed journal record corresponding to the file data. The method also includes generating a first file operation request based, at least in part, on the transaction request. The method also includes sending the first file operation request to a first segment server corresponding to the first segment identifier, wherein the first segment server generates a second distributed journal record corresponding to the file data on a memory device associated with the first segment server.

Method and system for journaling data updates in a distributed file system

Embodiments described herein describe a file server used in an association with devices to implement a distributed-file system. The file server includes processor that is operative to store a first shadow tree entry providing a pointer to a file system object, where the first shadow tree entry provides an alternative to a first remote ancestor directory to access the file system object in the distributed file system.

A method of performing a file system consistency check in a distributed, segmented file system, includes: analyzing primary objects of a first segment of the file system to determine if a first primary object points to a second primary object of a second segment separate from the first segment, storing, if the first primary object points to the second primary object of the second segment, a first indication indicating that the first primary object points to the second primary object of the second segment, the first indication indicating an expected location of the second primary object; analyzing a shadow directory of the selected segment to determine an expected location of a third primary object, and an expected pointer of the third primary object indicative of a location and a name of a fourth primary object, the third primary object being contained in a segment other than the first segment; and storing a second indication indicating the expected location of the third primary object and the expected pointer of the third primary object.

File system consistency checking in a distributed segmented file system

A system for implementing a distributed, segmented file system includes file servers that each are configured to control separate segments of the distributed-file system, the file servers including: a memory interface configured to communicate with a memory storing at least one of the segments of the distributed file system; a communication interface coupled to at least another of the file servers; and a processor coupled to the memory interface and the communication interface and configured to control, read, and write to file system objects stored in the memory. The system further includes means for transferring permission for access to a requested file system object from an owner server currently controlling a segment where a requested object resides to an access-requesting server.

Delegations and caching in a distributed segmented file system

A system includes storage configured to store file system entities, including directories and files, residing in segments of a distributed, segmented single file system, file servers configured to implement the single file system with separate ones of the file servers controlling metadata of separate ones of the segments, and a controller configured to control storage of files in the file system such that for a master file stored in a first segment, a first replica of the master file will be stored in a second segment that is physically separate from the first segment, the controller being further configured to control storage of directories in the file system such that a single directory will include identifiers for the master file and the first replica.

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Marblehead, MA, United States of America

Boris Zuckerman