Emc Corporation

Emc IP Holding Company LLC

Siyu Zhou

Xiangping Chen

Miles Aram De Forest

Hongliang Tang

Mark K Ku

Khang Can

Qin Tao

Samuel Mullis

Sadagopan Balaraman

Sairam Iyer

Li Wan

Brian M Spadafora

A method is used in managing data accesses in storage systems. An access path to a storage object is evaluated. The storage object is associated with a first storage processor of a storage system for providing access to the storage object. The storage object is accessed using a second storage processor of the storage system. The storage system includes source and destination storage pools configured such that performance characteristics associated with the source storage pool is different from performance characteristics associated with the destination storage pool. The storage object resides in the source storage pool associated with the first storage processor. Based on the evaluation, the access path of the storage object is changed to the second storage processor based on a policy. The policy determines available storage space in the destination storage pool associated with the second storage processor for migrating the storage object to the destination storage pool.

Managing data accesses in storage systems

A method is used in iterating in parallel for deduplication. Based on an iteration scheme, a collection of sections is selected from a set of storage extents. Each section of the collection of sections includes subset of the contents of a storage extent of the set of storage extents. Based on the iteration scheme, each section of the collection of sections is arranged in an ordered arrangement. Based on the ordered arrangement, a deduplicating technique is applied in parallel to each section of the collection of sections.

Iterating in parallel for deduplication

Methods and apparatus for organizing a plurality of versions of a file in a file system. The plurality of versions of the file are stored in a data structure having a hierarchical organization that reflects relationships among the plurality of versions. Each version of the plurality of versions is assigned a name that identifies its position in the hierarchical organization. The hierarchical organization of the data structure and the descriptive naming convention used for the plurality of versions in the data structure facilitates deleting a version while retaining other versions derived from the version following the deletion of the version, and enables a staged initialization of the data structure upon system start-up.

Methods and apparatus for managing multiple point in time copies in a file system

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Millis, MA, United States of America

Siyu Zhou