Data selection for movement from a source to a target

A computer program product for managing data storage having a plurality of storage pools containing extents of data objects, 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:

• storing a first deduplicated data object in a primary storage pool;
• determining the duration of time that the first data object has resided in the primary storage pool;
• comparing the determined duration of time to a predetermined time interval;
• after the determined duration of time meets or exceeds the predetermined time interval, determining if the first data object has an extent referenced by another data object;
• and
• determining whether to move the first data object from the primary storage pool to a secondary storage pool as a function of whether the first data object has an extent referenced by another data object after the determined duration of time meets or exceeds the predetermined time interval.

A computing system, comprising:

• data storage having a plurality of storage pools containing extents of data objects;
• and
• a storage manager including a processor and a computer readable storage medium having computer readable program code embodied therein executed by the processor to perform managing operations, the managing operations comprising:
• storing a first deduplicated data object in a primary storage pool;
• determining the duration of time that the first data object has resided in the primary storage pool;
• comparing the determined duration of time to a predetermined time interval;
• after the determined duration of time meets or exceeds the predetermined time interval, determining if the first data object has an extent referenced by another data object;
• and
• determining whether to move the first data object from the primary storage pool to a secondary storage pool as a function of whether the first data object has an extent referenced by another data object after the determined duration of time meets or exceeds the predetermined time interval.