MIGRATING DATA ACROSS STORAGES WITH DISSIMILAR ALLOCATION SIZES

摘要

A method, system, and computer program product for migrating data across storages with dissimilar allocation sizes are provided in the illustrative embodiments. A determination is made of a minimum allocation unit size used for allocating space to a data at a source data storage device. A number of first minimum allocation units of a first minimum allocation unit size at a target data storage device is computed, wherein the number of first minimum allocation units can be completely occupied by a portion of the data. An amount of data left over after excluding the portion of the data from the data is computed. The portion of the data is migrated to the number of first minimum allocation units at the target. The amount of data left over is migrated to a second number of second minimum allocation units of a second minimum allocation unit size at the target.

主权项

1. A method for migrating data across storages with dissimilar allocation sizes, the method comprising:
determining, by a processor at a first data processing system, a minimum allocation unit size used for allocating space to a data at a source data storage device; computing, by a processor at a first data processing system, a number of first minimum allocation units of a first minimum allocation unit size at a target data storage device, wherein the number of first minimum allocation units can be completely occupied by a portion of the data; computing, by a processor at a first data processing system, an amount of data left over after excluding the portion of the data from the data; migrating, by a processor at a first data processing system, the portion of the data to the number of first minimum allocation units at the target; and migrating, by a processor at a first data processing system, the amount of data left over to a second number of second minimum allocation units of a second minimum allocation unit size at the target.