Emc IP Holding Company LLC

James O Owens

Dixitkumar Vishnubhai Patel

Jean-Pierre Bono

William C Davenport

Srinivasa Rao Vempati

Ye Zhang

Yingchao Zhou

Yaming Kuang

Marshall Hansi Wu

James H Shimer

Paul Hao Pan

An apparatus comprises a processing device configured to determine that an entry of a first data structure comprises an indication that a link between a first logical page and a second logical page is broken and to determine that a first address pointed to by the first logical page and a second address pointed to by the second logical page match. The processing device is further configured to determine that the first logical page corresponds to the second logical page based at least in part on the determination that the first address and the second address match and to add an indication of a third address that corresponds to the first logical page to an entry associated with the second logical page.

Reconstruction of links between logical pages in a storage system

An apparatus comprises a processing device configured to determine that a first data structure comprises an indication that a first logical page is an orphan and to obtain the first logical page based at least in part on the determination. The processing device is configured to identify a pointer to a second logical page from a second data structure of the first logical page and to determine a data offset that corresponds to the pointer. The processing device is configured to determine a snapshot group that corresponds to the first logical page and to identify a candidate logical page based at least in part on the data offset, the snapshot group and the pointer. The processing device is configured to determine that the candidate logical page is a match for the first logical page and to link the candidate logical page and the first logical page together.

Reconstruction of links to orphaned logical pages in a storage system

An apparatus comprises a processing device configured to obtain a first logical page and to obtain a first namespace address corresponding to a second logical page from the first logical page. The processing device is further configured to obtain the second logical page based at least in part on the first namespace address and to identify a given entry of a plurality of entries of the second logical page based at least in part on index information contained in the first logical page. The processing device is further configured to determine that the given entry comprises data other than a second namespace address corresponding to the first logical page and to add the second namespace address corresponding to the first logical page to the given entry based at least in part on the determination that the given entry comprises data other than the second namespace address.

Reconstruction of logical pages in a storage system

A method is used in managing recovery of file systems. A determination is made during recovery of a file system as to whether information required for recovering the file system is missing. Based on the determination, storage for a slice is provisioned. The slice is updated with the information required for recovering the file system. Recovery of the file system is performed.

Managing recovery of file systems

A method is used in managing data inconsistencies in file systems. A data inconsistency is detected in a file system data block of a file system. The file system includes a set of file system data blocks. Information regarding the data inconsistency is provided to a client of the file system. Based on the information, the client is enabled to determine an action for recovering from the data inconsistency.

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Nashua, NH, United States of America

James O Owens