Veritas Technologies LLC

Ranbaxy Laboratories, Inc.

Symantec Corporation

Council of Scientific and Industrial Research

Lupin, Inc.

Texas Instruments Corporation

University of Illinois

Rush University Medical Center

Sanjay Kumar Jain

Neelima Sinha

Nitya Anand

Anindya Banerjee

Shirish Vijayvargiya

Anita Mehta

Anil Kumar Saxena

Kedar Shrikrishna Patwardhan

Sushil Sarjerao Patil

Sudershan Kumar Arora

Jang Bahadur Gupta

Gourhari Jana

Rakesh Kumar Sinha

Pooja Mahadik

Madhur Ray

Shankar Ajay

Mangal Prasad Dubey

Ram Mohan Saxena

Gyanendra Kumar Patnaik, Deceased

Abhishek Kumar Gopalka

Neha Naik

Ram Shankar Upadhayaya

Niranjan Sanjiv Pendharkar

Shailesh Marathe

Sanjay Kumar

Robert A Anderson

Donald Paul Waller

Calvin J Chany, Ii

Mukesh Sohanlal Bafna

Anirban Mukherjee

Anita Chugh

Duane L Venton

Lourens J D Zaneveld

Abhijeet Gopal Godbole

Mithlesh Thukral

Abhishek Gupta

Suprio Das

Jang Bahadurgupta

Ramprasad Chinthekindi

Xiao-Hui Diao

Aleksej Krunic

Laxminarayan G Hegde

Jr Robert A Anderson

Ii Calvin J Chany

Various systems and methods are provided for using various in-core and on-disk data structures to improve the file creation process through the use of previously-occupied inodes. For example, one method involves updating an in-core data structure in response to receiving a command to delete a first file, such that a first node is assigned to the first file, the in-core data structure is stored in a non-persistent computer-readable storage medium, the in-core data structure comprises a plurality of entries, each of the entries comprises information identifying a respective inode of a plurality of inodes as being available, and the updating the in-core data structure comprises storing information regarding the first inode in a first entry of the plurality of entries; and creating a second file, where the creating comprises assigning the first inode to the second file using the information regarding the first inode stored in the first entry.

Method to use previously-occupied inodes and associated data structures to improve file creation performance

Various systems, methods and apparatuses for coordinating the sharing of cache data between cluster nodes operating on the same data objects. One embodiment involves a first node in a cluster receiving a request for a data object, querying a global lock manager to determine if a second node in the cluster is the lock owner of the data object, receiving an indication identifying the second node as the lock owner and indicating that the data object is available in the second node's local cache, requesting the data object from the second node, and then receiving the data object from the second node's local cache. Other embodiments include determining whether the lock is a shared lock or an exclusive lock, and either pulling the data object from the local node of the second cache or receiving the data object that is pushed from the second node, as appropriate.

System, method and mechanism to efficiently coordinate cache sharing between cluster nodes operating on the same regions of a file or the file system blocks shared among multiple files

The disclosed computer-implemented method for improving the efficiency of point-in-time representations of databases may include (1) identifying a database that includes (A) one or more utilized storage locations that store substantive data and (B) one or more empty storage locations that are not currently storing any substantive data, (2) creating a point-in-time representation of the database by (A) identifying the empty storage locations and (B) flagging the empty storage locations in connection with the point-in-time representation of the database, (3) detecting a request to write certain substantive data to at least one of the empty storage locations, and then in response to detecting the request, (4) satisfying the request while refraining from performing a copy-on-write operation on the empty storage location due at least in part to the empty storage location not currently storing any substantive data. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for improving the efficiency of point-in-time representations of databases

The disclosed computer-implemented method for managing delayed allocation on clustered file systems may include (i) receiving, at a global lock manager that stores storage disk allocation information for a plurality of nodes in a clustered file system, a lock request from a node that requests a lock range on a storage disk to store data from a file, (ii) reserving, by the global lock manager, the lock range, (iii) receiving, at the global lock manager, from an additional node, an additional lock request for an additional lock range to store additional data from the file, and (iv) reserving, by the global lock manager, the additional lock range to be adjacent to the lock range on the storage disk based on the additional data on the additional node being from the same file as the data on the node. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for managing delayed allocation on clustered file systems

A two-wheel vehicle includes a frame and a metallic side stand, rotatable within a bracket attached to the frame. The metallic side stand is rotatable between a first position that supports the two-wheel vehicle when parked and a second position substantially adjacent the frame. The two-wheel vehicle also includes an inductive sensor attached to the two-wheel vehicle and connected to detect at least one position of the metallic side stand and a circuit connected to receive an output from the inductive sensor and to provide a signal that reflects the position of the side stand.

Side stand indicator for a two-wheel vehicle

Various computer-implemented methods for selective defragmentation are disclosed. In one example, an exemplary method for performing such a task may include: 1) identifying a file system, 2) tracking changes to files in the file system, 3) creating a list of changed files, and then 4) selectively defragmenting files in the list of changed files. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for selective defragmentation

Disclosed herein are compounds and compositions useful for reducing the risk of infection. In particular, disclosed herein are mandelic acid condensation polymers, compositions comprising such compounds, processes for producing such compounds, and methods of using such compounds.

Mandelic acid condensation polymers

A computer-implemented method for mitigating write-back caching failures may include (1) detecting a failure that impairs at least one write-back cache that temporarily caches updates for individual files stored on a storage device, (2) identifying an attribute of an individual file stored on the storage device in response to the failure that impairs the write-back cache, (3) determining that at least a portion of the individual file is obsolete based at least in part on the attribute of the individual file, and then (4) performing at least one mitigating action with respect to the individual file to address the obsolete portion of the individual file. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for mitigating write-back caching failures

Caching metadata that identify hot blocks at a per local cache level are tracked. Tracked caching metadata are maintained so as to be persistent and shared across nodes of the cluster. Local caches are pre-warmed by using maintained caching metadata, responsive to detecting specific node level events. Such events can result in hot blocks being absent from a local cache, such as a failover between nodes or an unexpected failure local to a specific node. Another event example is the access of shared storage content, such as opening a file or mounting a file system by a specific node, in response to which the associated local cache can be pre-warmed using the tracked caching metadata for the specific file, or for each file of the file system. To pre-warm a local cache, hot blocks of stored content identified by corresponding caching metadata are loaded into the local cache.

Local cache pre-warming

A computer-implemented method for securing storage space may include 1) identifying a block map that indicates whether each of a plurality of blocks within a storage system is to return zeroed data in response to read operations, 2) identifying a read operation directed to a block of the storage system that includes non-zeroed data, 3) determining, in response to identifying the read operation, that the block map indicates that the block is to return zeroed data in response to the read operation, and 4) returning zeroed data in response to the read operation based on determining that the block map indicates that the block is to return zeroed data. Various other methods, systems, and computer-readable media are also described.

Systems and methods for securing storage space

A computer-implemented method for migrating files to tiered storage systems may include 1) identifying at least one file to migrate from a first file system to a second file system, where the second file system may include a plurality of storage tiers, 2) identifying file metadata associated with the file as stored on the first file system, 3) before writing the file to the second storage system, selecting a storage tier from the plurality of storage tiers based at least in part on the file metadata, and 4) writing the file directly to the selected storage tier within the second file system to avoid moving the file to the selected storage tier after writing the file to the second file system. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for migrating files to tiered storage systems

A system and method for migrating file systems is provided. A file system migration operation copies a plurality of files from a first file system to a second file system. A request to access one of the files being migrated during the file system migration operation results in the creation of a pseudo vnode for the file being requested in the second file system. The pseudo vnode is created prior to creating a vnode for the file in the second file system. In addition, the pseudo vnode is associated with a vnode of the file at the first file system. Information identifying the pseudo vnode is then returned to the application.

Lookup optimization during online file system migration

A computer-implemented method for copying database files may include (1) identifying a request to copy a database file to a target location, and in response to identifying the request to copy the database file to the target location, (2) identifying a preallocated but unused portion of the database file, (3) transmitting a used portion of the database file to the target location, and (4) transmitting a metadata representation of the unused portion of the database file to the target location, the metadata representation being smaller than the unused portion. Various other methods and systems are also disclosed.

Systems and methods for copying database files

Techniques for optimizing data migration are disclosed. In one particular embodiment, the techniques may be realized as a method for optimizing data migration may comprise receiving a request for initiating a data migration application and migrating, via at least one computer processor, at least one data file from a migration list during the data migration application. The method for optimizing data migration may also comprise monitoring the migration of the at least one data file and determining whether the at least one data file is active during the migration of the at least one data file. The method for optimizing data migration may further comprise deferring the migration of the at least one data file based at least in part on a determination that the at least one data file is active and recording information associated with the at least one data file if the at least one data file is active.

Techniques for optimizing data migration

Growing community of inventors

Pune, India

Sanjay Kumar Jain