Quest Software Inc.

Dell Products Inc.

Druva Inc.

Abhijit Dinkar

Murali Bashyam

Vinod Jayaraman

Goutham Rao

Tarun Tripathy

Michael E Root

Mark Taylor

Brian Smith

Naresh Saladi

Vladimir Fonseca Alvarez

Shekhar Pardeshi

Techniques and mechanisms described herein provide for global deduplication in a cloud-based storage system. According to various embodiments, a global segment reference map can be created for data segments when a data segment has not been previously added to the global segment reference map. For each data segment not added to the global segment reference map, those data segments can be deleted from a cloud storage location.

Global deduplication in a cloud-based storage system

Techniques and mechanisms described herein provide for verification of data across cloud-based and on-premises data storage systems. According to various embodiments, a backup client implemented on a first compute node can store a data file in a backup data repository. A data guardianship can store first data file state information describing the data file in a key-value store accessible via the internet. A data verification instance can analyze the backup data repository to verify that the data file is stored intact in the backup data repository.

Data guardianship in a cloud-based data storage system

Techniques and mechanisms are provided for migrating data blocks around a cluster during node addition and node deletion. Migration requires no downtime, as a newly added node is immediately operational while the data blocks are being moved. Blockmap files and deduplication dictionaries need not be updated.

Data block migration

Techniques and mechanisms described herein provide for facilitating communications between one or more client machines and one or more cloud storage providers. According to various embodiments, a virtual machine may communicate with one or more client machines via a standard data storage protocol. The virtual machine may also communicate with one or more cloud storage providers via the internet. The virtual machine may then perform operations such as receiving data from a client machine and storing it to the cloud, retrieving data from the cloud and providing it to the client machine, querying data stored in the cloud, reporting on and verifying data stored in the cloud, and transferring and/or transforming data stored in the cloud.

Data management across cloud storage providers

Techniques and mechanisms described herein provide for verifying data across cloud-based and on-premises data storage systems. According to various embodiments, data can be received by a gateway from a client machine and stored in a file data repository accessible via the internet. The stored data can have a common master namespace. Indications of updates to the master namespace can be received. Updated namespace data and metadata can be transmitted to the gateway.

Global namespace in a cloud-based data storage system

Techniques and mechanisms described herein facilitate the transmission of a data stream from a client device to a networked storage system. According to various embodiments, a fingerprint for a data chunk may be identified by applying a hash function to the data chunk via a processor. The data chunk may be determined by parsing a data stream at the client device. A determination may be made as to whether the data chunk is stored in a chunk file repository at the client device. A block map update request message including information for updating a block map may be transmitted to a networked storage system via a network. The block map may identify a designated memory location at which the chunk is stored at the networked storage system.

Client-side deduplication with local chunk caching

Certain embodiments of the present disclosure provide systems and associated methods for dynamically re-serializing virtual tape library cartridges. The system comprises a first server node including a first virtual tape library residing on a deduplication file system, in which a backup data file corresponding to a first cartridge is stored in a first container with a first base prefix. A second server node includes a second virtual tape library residing on a second deduplication file system, and is configured to receive and store a replica of the backup data file corresponding to a second cartridge in a second container such that the second cartridge includes the same first base prefix as the first cartridge. An activation code is assigned to the second container, and used to re-serialize the first base prefix to form a second base prefix such that the second cartridge is presented with the second base prefix.

System and method for dynamic re-serialization of VTL devices and cartridges

Techniques and mechanisms described herein facilitate the transmission of a data stream to a networked storage system. According to various embodiments, a data stream may be parsed to identify one or more uncompressed data chunks for transmission to a networked storage system. Each uncompressed data chunk may be compressed to produce a respective compressed data chunk. Each compressed data chunk may be transmitted to the networked storage system via a network for storage at the networked storage system.

Chunk compression in a deduplication aware client environment

Techniques and mechanisms described herein facilitate the transmission of a data stream to a networked storage system. According to various embodiments, a determination may be made as to whether an amount of available computing resources at a client device meets or exceeds a computing resource availability threshold at the client device. A processing operation on a data stream may be performed at the client device to produce a pre-processed data stream when the amount of available computing resources meets or exceeds the computing resource availability threshold. The pre-processed data stream may be transmitted to a networked storage system for storage via a network. The networked storage system may be operable to store deduplicated data for retrieval via the network.

Technique selection in a deduplication aware client environment

Techniques and mechanisms described herein facilitate the acceleration of data transfer protocols via client side de-duplication techniques for transmitting data from a client device to a networked storage system while maintaining protocol usage characteristics. while preserving the same presentation semantics to the users. A data chunk may be determined at a client device by parsing a data stream generated at the client device via a network storage protocol. A fingerprint for the data chunk may be identified by applying a hash function to the data chunk. A determination may be made as to whether the chunk is stored at a networked storage system by transmitting the fingerprint to the networked storage system via a network. The client device may transmit a block map update request message including information for updating a block map to the networked storage system.

Accelerating transfer protocols

Techniques and mechanisms are provided to allow for selective optimization, including deduplication and/or compression, of portions of files and data blocks. Data access is monitored to generate a heat index for identifying sections of files and volumes that are frequently and infrequently accessed. These frequently used portions may be left non-optimized to reduce or eliminate optimization I/O overhead. Infrequently accessed portions can be more aggressively optimized.

Heat indices for file systems and block storage

Techniques and mechanisms are provided for storing data in a backup storage system. According to various embodiments, a first blockmap in a backup storage system may be identified. The first blockmap may correspond with a first restore point. The first blockmap may identify a first plurality of data segments. Each of the first plurality of data segments may have associated therewith a respective storage location in the backup storage system. The first blockmap may be compared with a designated storage system state to identify a subset of the first plurality of data segments that each correspond with a respective matching data segment in the designated storage system state. A second blockmap may be stored in the backup storage system. The second blockmap may correspond with a second restore point. The second blockmap may include the identified subset of the first plurality of data segments.

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San Jose, CA, United States of America

Abhijit Dinkar