Cohesity, Inc.

Emc IP Holding Company LLC

Prajakta Balkrishna Ayachit

George Mathew

Ajith Krishnamurthy

Suman Chandra Tokuri

Dheer Moghe

Abhijit Chakankar

Prashant Gothi

Krithika Subramanian

Prem Krishnaa Jagan Mohan

Megha Agarwal

Dominic Tu Ping Cheah

Sai Madan Mohan Reddy Patlolla

Apurv Gupta

Rupesh Bajaj

Markose Thomas

Igor Korsunsky

Zheng Cai

Vivek Velankar

Janga Varun

An identification of a primary snapshot created for a primary storage system is received. A first request for a first metadata of a first file directory structure object associated with the primary snapshot is issued. A second request for data content of the first file directory structure object associated with the primary snapshot is determined to be sent to a recipient device based on a received response to the first request. A third request for a second metadata of a second file directory structure object associated with the primary snapshot is determined to be sent to the recipient device. Timing and ordering of issuance of a plurality of requests that at least include the second request and the third request to the recipient device are managed based on a determined performance metric of the recipient device and corresponding relative impact to the performance metric of the recipient device.

Adaptive throttling of metadata requests

A request to restore an instance of an object that is stored in a storage associated with a cluster of nodes to a target destination is received. Data of the object is divided into a plurality of data portions. Corresponding data portions of the plurality of data portions are assigned to each node of a plurality of nodes of the cluster. It is determined that a first node of the cluster of nodes does not currently store in a storage associated with the first node at least a part of a corresponding data portion of the object assigned to the first node. At least the part of the corresponding data portion of the object assigned to the first node is received at the first node from a second node of the cluster of nodes. At least the part of the corresponding data portion of the object received from the second node is provided from the first node to the target destination.

Parallel restore of a large object

An identification of a primary snapshot created for a primary storage system is received. A first request for a first metadata of a first file directory structure object associated with the primary snapshot is issued. A second request for data content of the first file directory structure object associated with the primary snapshot is determined to be sent to a recipient device based on a received response to the first request. A third request for a second metadata of a second file directory structure object associated with the primary snapshot is determined to be sent to the recipient device. Timing and ordering of issuance of a plurality of requests that at least includes the second request and the third request to the recipient device are managed based on a determined performance metric of the recipient device and corresponding relative impact to the performance metric of the recipient device.

A technique for restoring content is described. The technique includes receiving a specification of content to be restored to a target storage from a data source. The technique also includes determining task units to be performed to restore the specified content. Each task unit is associated with a corresponding assigned weight value. Based on the corresponding assigned weight values, the task units are distributed to different task groups. The task groups are processed in parallel with each other to concurrently perform at least a portion of the distributed task units.

Efficient restoration of content

A data management device includes a buffer and a processor. The processor may select an unprocessed full key and generate a buffer entry based on a difference between an entry of a local snapshot specified by the unprocessed full key and an entry of a previous local snapshot specified by the unprocessed full key. The processor may make a first determination that a lookup key entry associated with the unprocessed full key is different than a lookup key entry associated with a processed full key. The process may add the generated buffer entry to the buffer after processing the buffer in response to the first determination.

Method for state based snapshot difference with restart capability

Embodiments are described for repairing the locality of a namespace index on a deduplication storage device. A namespace index is selected from a plurality of namespace indices, each of which is mountable on the storage system. The selected namespace index is traversed and divided into regions, each of which was stored in one or more storage containers. Locality information for each region is generated, including a density metric and a distribution metric. If either metric is below a threshold value for the metric, then the region is enqueued for namespace locality repair. A region can be repaired by reading the region into memory and flushing the memory to co-located containers on the storage system.

Method to repair the locality of the namespace on deduplication storage file system

According to one embodiment, a request for seeding a predetermined number of small files with a predetermined locality in a storage system is received, each of the files to have a predetermined file size. In response to the request, a plurality of segments and fingerprints of the segments are generated. File trees representing the predetermined number of files respectively are generated based on the fingerprints of the segments, each of the files represented by the segments having the predetermined file size. A namespace representing one or more directories of the files is generated based on the file trees, where each of the directories of files satisfies the predetermined locality. The namespace and segments corresponding to the files of one or more directories are written to a storage device of the storage system.

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Pune, India

Prajakta Balkrishna Ayachit