Emc IP Holding Company LLC

Emc Corporation

Kenny Zhou

Kent J Costa

Yi Bin Wang

Feng Zhang

Ye Zhang

Hao Pan

Qi Mao

Hansi Wu

Pu Wang

Chuangxian Wei

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

Growing community of inventors

Shanghai, China

Kenny Zhou