A storage control device includes a processor which performs first copy of copying first data stored in a first storage device into a first backup region upon detecting a failure presage in the first storage device. The processor performs first write of writing second data specified in a first write request to the first storage device and second write of writing the second data into the first backup region upon receiving the first write request while performing the first copy. The processor performs second copy of copying third data stored in the first backup region to a second storage device upon completing the first copy. The processor performs third write of writing fourth data specified in a second write request to the second storage device in place of the first storage device upon receiving the second write request after completion of the second copy.

Described is a tape library system that generally comprises a plurality of tape drives and a data bus that links a host computer system to a first tape drive address and a second tape drive address. However, the first tape drive address points to a first controller and switch system that assumes the identity of one of the tape drives. The first controller and switch system is linked to a first tape drive adapted to cooperate with a first type of tape cartridge and a second tape drive adapted to cooperate with second type of tape cartridge. The second tape drive address points to a second controller and switch system that assumes the identity of a different one of the tape drives. The second controller and switch system is linked to a third tape drive adapted to cooperate with the first type of tape cartridge and a third tape drive adapted to cooperate with the second type of tape cartridge.

A system includes a utilization calculation module, a performance calculation module, an input module and an output module. The input module to receive a user-selection of tape drives and time ranges over which to calculate utilization data and calculate performance data. The utilization module to calculate utilization data of the selected tape drives over the selected time ranges. The performance module to calculate performance data of the selected tape drives over the selected time ranges. The output module to generate single data points representing output of utilization data and performance data of the respective selected tape drives, and to analyze the data points to determine whether to highlight the data points in a first user-definable display region representing higher utilization and performance tape drives relative to data points in a second user-definable display region representing lower utilization and performance tape drives.