Operating Systems

3. Carefully coordinate the acquisition and decommissioning of DASD subsystems to minimize the amount of time they both need to be simultaneously powered and cooled:

• Hardware vendors traditionally supply disk subsystems with a free maintenance period. At the end of this period, financial incentives are usually offered to replace disk subsystems with new models that provide increased capacity and performance. Typically, this new hardware is more energy-efficient, generates less heat per terabyte, and uses less floor space per terabyte.

• Migrating data to new hardware is a common occurrence. It makes sense to use SRM and sophisticated DASD migration utilities to optimize these migrations, thus moving the data as quickly and efficiently as possible. This avoids extended periods where both the old and new disk subsystems are consuming resources.

4. Maximize the efficiency and utilization of cartridge robots:

• Tape hardware can be another significant consumer of power, cooling, and floor space. Cartridge robot devices can store thousands of cartridges for quick access. SRM technology should be used to manage these robots— tracking usage and automatically ejecting infrequently used cartridges.

• SRM also should be used to track scratch tape availability and free-cell counts to provide history and forecasting information. In this way, SRM can be used to keep to a minimum the number of cartridge robot devices installed and delay the purchase of additional robots as long as possible.

5. Use virtual tape to reduce the number of physical tape drives and cartridges:

• Virtual tape helps deliver a higher ROI by stacking many virtual volumes on a single physical volume. That means fewer physical tapes to buy, transport, and store.

• Virtual tape can be hardware-based or software-based. Software virtual tape solutions allow for the use of less tape hardware and media, thus reducing costs, improving tape performance, and improving utilization.

• SRM can be used to simplify management of virtual tape deployments by automating and centralizing administration to help maximize existing resources, achieving higher utilization and optimization of the virtual and physical media.


IT organizations can significantly reduce the energy consumption of their data centers by effectively leveraging SRM capabilities to make optimum use of their existing storage infrastructure, defer acquisition of new hardware, avoid acquiring excess capacity, and limit the amount of time spent simultaneously supporting old and new systems. To achieve these benefits, storage managers should ensure that SRM capabilities and policies are appropriately applied across the full spectrum of mainframe storage infrastructure—including DASD, tapes, robotics, virtual tape systems, and tape management systems.

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