Emc Corporation

Pu Wang

Ye Zhang

Qi Mao

William C Davenport

Chao Zheng

Yining Si

Alexander Daniel

Kent J Costa

Hansi Wu

Kenny Zhou

Chuangxian Wei

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

Techniques are described for copying data using a throttling mechanism to achieve a desired time delay. A request is received to copy a data portion from a source location of a first physical device to a target location of a second physical device. A desired average delay time is determined in accordance with a plurality of values including a throttle value affecting a rate at which data is copied from the source location to the target location. The request is partitioned into subrequests. The data portion is partitioned into a subportions. Each of the subrequests copies one of the subportions. The subrequests are performed whereby a time delay is introduced between at least two of the plurality of subrequests and whereby an average time delay with respect to each pair of consecutively issued subrequests is the desired average time delay.

Throttling techniques for use with data relocation

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Shanghai, China

Pu Wang