Emc IP Holding Company LLC

Vijay Panghal

Shrinand Javadekar

Deepti Chheda

Kee Shen Quah

Rajiv Desai

Niraj Tolia

A snapshot is received at the MDS from a backup storage location at a point-in-time subsequent to taking the snapshot, wherein the MDS comprises a map identifying an object store location for a plurality of data objects and a queue identifying individuals of the plurality of data objects that only reside on the transient object store. Individuals of the plurality of data objects identified in the queue are located on the distributed file system. The map is updated to identify the object store location for the individuals of the plurality of data objects identified in the queue.

Disaster recovery in a distributed file system

A method, article of manufacture, and apparatus for providing a site cache manager is discussed. Data objects may be read from a site cache rather than an authoritative object store. This provides performance benefits when a client reading the data has a better connection to the site cache than to the authoritative object store. The site cache manager controls the volume of stored data on the site cache to enhance performance by increasing the frequency of data object being read from or written to the site cache rather than the authoritative object store.

Site cache manager for a distributed file system

A metadata server determines ('MDS') a state associated with each of a plurality of object stores, wherein each object store is at an object store location. The state associated with each of the plurality of object stores is stored on the MDS. The MDS processes a client request for the object store location associated with one of the plurality of object stores in accordance with the state.

Maintaining multiple object stores in a distributed file system

An indication to retire a computer readable storage medium from the site cache is received. A plurality of data objects stored on the computer readable storage medium are replicated to at least one target computer readable storage medium in the site cache. The computer readable storage medium is removed from the site cache.

Decreasing a site cache capacity in a distributed file system

A method, article of manufacture, and apparatus for providing a site cache in a distributed file system is discussed. Data objects may be read from a site cache rather than an authoritative object store. This provides performance benefits when a client reading the data has a better connection to the site cache than to the authoritative object store.

Reading from a site cache in a distributed file system

A failing computer readable storage medium comprising a portion of a transient object store is detected at a site cache. The site cache associated with the transient object store is set to an error read only state. The failing computer readable storage medium is replaced with an operational computer readable storage medium.

Repairing a site cache in a distributed file system

A method, article of manufacture, and apparatus for providing a site cache in a distributed file system is discussed. Data objects may be written to a site cache prior to writing them to an authoritative object store. This provides performance benefits when a client writing the data has a better connection to the site cache than to the authoritative object store.

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Santa Clara, CA, United States of America

Vijay Panghal