US Patent 7685366 System and article of manufacture for storing data

Provided are a system, and article of manufacture, wherein a first storage unit is coupled to a second storage unit. The first storage unit and the second storage unit are detected. A determination is made that the first storage unit is capable of responding to a write operation faster than the second storage unit, and that the second storage unit is capable of responding to a read operation at least as fast as the first storage unit. Data is written to the first storage unit. A transfer of the data is initiated from the first storage unit to the second storage unit. The data is read from the second storage unit, in response to a read request directed at both the first and the second storage units.