Cisco Technology, Inc.

Mayuresh Vartak

Shravan Gaonkar

Krishna Yadappanavar

Faraz Ahmed Shaikh

Mallikarjunan Mahalingam

Jyothir Ramanan

Swapnil Pimpale

Ashwin Pednekar

Sandip Agarwala

Praveen Vegulla

Smit Shah

Abhishek Chaturvedi

Techniques for filesystem management for cloud object storage are described. In one embodiment, a method includes writing, by a filesystem layer, a plurality of entries to a log structured file tree, including filesystem metadata and filesystem data. The method includes performing a flush operation of the entries from the filesystem layer to one or more objects in a distributed cloud object storage layer. The method includes storing the filesystem metadata and the filesystem data to the one or more objects in the distributed cloud object storage layer. The method further includes storing flush metadata generated during each flush operation, including a flush sequence number associated with each flush operation. Each object of the one or more objects in the distributed cloud object storage layer is identified by a key that identifies the flush sequence number, an object identifier, and a rebirth identifier.

Filesystem management for cloud object storage

Presented herein are methodologies for implementing erasure coding in a distributed log structured storage system. A method includes receiving a write request for first data from a file system, selecting a physical sector on a selected storage device in an array of storage devices on which to store the first data, assigning a key to the physical sector, storing the key and an indication of the physical sector in a key-to-physical medium map, erasure coding the data, including generating parity data associated with the first data, writing the first data and the parity data as a data stripe to each storage device in the array of storage devices and, in response to receiving the write request, sending the key to the file system. Read, update, and delete procedures in the context of a log structured framework are also described.

System and method for garbage collecting inline erasure coded data for a distributed log structured storage system

Techniques for filesystem durable write operations to cloud object storage are described. In one embodiment, a method includes receiving at least one of a read operation or a write operation from a filesystem layer. The read operation identifies content stored in a distributed content object storage layer that is to be retrieved and the write operation identifies content that is to be stored to the distributed content object storage layer. The method includes converting the read operation into a get operation or the write operation into a put operation. The method further includes storing an index that maps the read or write operation to the get or put operation and includes an association between the content identified by the filesystem layer to objects in the distributed content object storage layer. The method includes sending the get or put operation to the distributed content object storage layer for the identified content.

Filesystem durable write operations to cloud object storage

System and method for inline erasure coding for a distributed log structured storage system

Creating and using highly available transaction logs in a distributed storage system is described, where the storage controller functions of the distributed storage system are separated from that of distributed storage system storage media. In an exemplary embodiment, a storage controller server receives a transaction entry at a first storage pool of the distributed storage system. The storage controller server further looks up a transaction log to store the transaction entry, where the transaction log is associated with a second storage pool. The storage controller server routes the transaction entry to the second storage pool, wherein the second storage pool stores the transaction entry.

Highly available transaction logs for storing multi-tenant data sets on shared hybrid storage pools

Growing community of inventors

Sunnyvale, CA, United States of America

Mayuresh Vartak