International Business Machines Corporation

Jason D Hagar

Michael G Sisco

Yu Meng Li

Kai A G Asher

In one embodiment, a method includes receiving a query related to a first data extent. The method also includes determining whether the first data extent is eligible for deletion based on a first sliding window time period equal to a predetermined retention period added to a predetermined deletion cushion in response to the query requesting a deletion operation for the first data extent. The method also includes determining whether the first data extent is eligible for linkage based on a second sliding window time period equal to the retention period less a predetermined linkage cushion in response to the query requesting a linkage operation for the first data extent. The linkage cushion includes less time than the deletion cushion.

Lockless management of deduplicated data using reference tags

A method for restoring multiple objects from tape (1) generates a list of objects to be restored from tape; (2) identifies a starting location of a first object on the tape; and reads, into a buffer from the tape, an entire buffer of data from the starting location. The method then (4) determines a length of the first object; (5) restores the first object; and (6) finds a start of a next object in the buffer using a length of the previous object. The method (7) determines a length of the next object by analyzing metadata of the next object and (8) restores the next object if the next object is in the list. The method (9) repeats steps (6), (7), and (8) until the end of the buffer is reached or all objects in the list have been restored. A corresponding system and computer program product are also disclosed.

Optimized reading of multiple objects from tape

In one embodiment, a method includes creating a data extent catalog table including information related to data extents stored to computer readable storage media, receiving a query related to a first data extent, and determining whether the data extent is stored to the one or more computer readable storage media based on analysis of the data extent catalog table. Moreover, the method includes determining whether the first data extent is eligible for deletion based on a first sliding window time period. In addition, the method includes determining whether the first data extent is eligible for linkage based on a second sliding window time period.

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Tucson, AZ, United States of America

Jason D Hagar