Robin Systems, Inc.

Symantec Corporation

Partha Sarathi Seetala

Dhanashankar Venkatesan

Gurmeet Singh

Ripulkumar Hemantbhai Patel

Ravi Kumar Alluboyina

Jagadish Kumar Mukku

Tushar Doshi

Manjunath Mageswaran

Lakshay Badlani

Raghavendra Pandimakki Ganesha

A new snapshot of a storage volume is created by instructing computing nodes to suppress write requests. Once pending write requests from the computing nodes are completed, storage nodes create a new snapshot for the storage volume by allocating a new segment to the new snapshot and finalizes and performs garbage collection with respect to segments allocated to the previous snapshot. Subsequent write requests to the storage volume are then performed on the segments allocated to the new snapshot. A segment maps segments to a particular snapshot and metadata stored in the segment indicates storage volume addresses of data written to the segment. The snapshots may be represented by a storage manager in a hierarchy that identifies an ordering of snapshots and branches to clone snapshots.

Creating snapshots of a storage volume in a distributed storage system

A bundled application includes a plurality of entities such as logical storage volumes, application instances, pods, clusters, and computing nodes that are dependent on one another. Dependencies of the bundled application on individual entities is determined and quantified. Impact of failure of an entity may be determined using the dependencies. Dependency may be determined with reference to redundancy among entities. Usage of an entity by other entities and potential redistribution may be determined.

Monitoring and managing of complex multi-role applications

A new snapshot of a storage volume is created by instructing computing nodes to suppress write requests. An orchestration layer implements a multi-role application that is provisioned with virtualized storage and computation resources. A snapshot of the application may be created and used to rollback or clone the application. Clones snapshots of storage volumes may be gradually populated with data from prior snapshots to reduce loading on a primary snapshot. A multi-role application may be orchestrated using multiple orchestration approaches and objects of the multi-role application may be discovered and added to an application definition. The application definition may be used to create snapshots of the application and the snapshot may be used to rollback, clone, backup, or migrate the application.

Orchestration of heterogeneous multi-role applications

A storage scheme allocates portions of a logical volume to storage nodes in excess of the capacity of the storage nodes. Slices of the storage nodes and segments of slices are allocated in response to write requests such that actual allocation on the storage nodes is only in response to usage. Segments are identified with virtual segment identifiers that are retained when segments are moved to a different storage node. Logical volumes may therefore be moved seamlessly to different storage nodes to ensure sufficient storage capacity. Data is written to new locations in segments having space and a block map tracks the last segment to which data for a given address is written. Garbage collection is performed to free segments that contain invalid data, i.e. data for addresses that have been subsequently written to.

Storage scheme for a distributed storage system

A system maintains a consistency database that maintains a status (current, down, stale) for copies of logical storage volumes stored on storage nodes. As failures are detected, the consistency database is updated. Copies are synchronized with one another using information in the consistency database. Write operations on a primary node for a slice of a logical storage node are assigned a virtual block address (VBA) that is mapped to a logical block address (LBA) within the slice. Consistency of the VBAs of the primary node and that of a secondary node is evaluated and used to detect currency. VBA holes are detected and corresponding write commands resent to maintain currency. Physical segments on the primary node are assigned virtual segment identifiers (VSID) that are maintained consistent with VSIDs on clone nodes so that they can be used for garbage collection and synchronization.

Maintaining consistency among copies of a logical storage volume in a distributed storage system

A computer system and method is disclosed for storing large volumes of event data. The system receives access event logs including indications of access events to files stored on a set of storage devices. Each indication includes respective values for a plurality of access event attributes. The system uses the indications to store multiple segment files, each corresponding to a respective subset of the indications. Each segment file stores data as multiple tiles, where each tile includes a compressed copy of those access event indications of the segment file that have a shared value for one of the access event attributes. Each tile is stored contiguously within a set of storage devices.

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San Jose, CA, United States of America

Partha Sarathi Seetala