Optimizing performance of physical disk drives in a disk array storage
device with a plurality of logical volumes is accomplished by accumulating statistics
over an interval to select two logical volumes for an exchange. After testing to
determine any adverse effect of making that change, the exchange occurs to more
evenly distribute the loading on individual physical disk storage devices. One
set of statistics, seek time, is obtained by combining estimated disk access information
and an interpolated seek time obtained from a template that stores characteristics
seek times among different pairs of segments that define a physical disk device
independently of a logical volume configuration.
