Emc IP Holding Company LLC

Emc Corporation

Kent J Costa

Feng Zhang

Kenny Zhou

Yi Bin Wang

Ye Zhang

Haitao Zhou

Hao Pan

Qi Mao

Jiajie Sun

Pu Wang

Hansi Wu

Chuangxian Wei

Leonid Wang

A method, computer program product, and computer system for identifying, by a computing device, historical block usage in a plurality of slices for a user. At least a portion of the plurality of slices to keep during an evacuation process for the plurality of slices may be determined. At least the portion of the plurality of slices may be excluded from the evacuation process for the plurality of slices based upon, at least in part, the historical block usage in the plurality of slices for the user.

System and method for smart pool space reclamation

A method of efficiently checking a filesystem for errors is provided, the filesystem including a set of data blocks and a set of VBPs, the set of VBPs arranged in a set of VBP blocks, each VBP block storing a plurality of the VBPs. The method includes multiple stages, one stage including iterating through VBP blocks of the filesystem to generate a validity bitmap, and a later stage including traversing a block pointer structure associated with each of a set of files of the filesystem, the traversal making reference to the validity bitmap.

Techniques for efficiently performing a filesystem consistency check

A technique for verifying the consistency of slice allocation metadata includes accessing, from user space of an operating system running on the data storage apparatus, a set of drivers running in kernel space of the operating system to obtain slice allocation metadata from the set of drivers, and identifying discrepancies in slice allocation metadata returned from the set of drivers on a per-file-system basis.

Verifying the consistency of slice allocation metadata

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Cary, NC, United States of America

Kent J Costa