Patent ID: 8880837

Claim:
A computer program for managing a data set comprised of extents in a storage system, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that executes to perform operations, the operations comprising: maintaining a data set comprised of a plurality of extents configured in at least one volume in the storage system; determining whether times at which at least two of the extents were allocated to the data set satisfy a criteria; allocating a first extent to the data set in a first volume to extend the data set, wherein the data set included the extents prior to allocating the first extent; determining whether a second extent can be allocated to the data set in the first volume in response to the allocating of the first extent; and allocating the second extent in a second volume for the data set in response to determining that the second extent cannot be allocated to the data set in the first volume and in response to the determining that the times satisfy the criteria.