IBM DS8000 manual Summary

reduce device queue delays. This is achieved by defining multiple addresses per volume. With Dynamic PAV, the assignment of addresses to volumes can be automatically managed to help the workload meet its performance objectives and reduce overall queuing. PAV is an optional feature on the DS8000 series.

￿Multiple Allegiance expands the simultaneous logical volume access capability across multiple zSeries servers. This function, along with PAV, enables the DS8000 series to process more I/Os in parallel, helping to improve performance and enabling greater use of large volumes.

￿I/O priority queuing allows the DS8000 series to use I/O priority information provided by the z/OS Workload Manager to manage the processing sequence of I/O operations.

Chapter 12, “Performance considerations” on page 253, gives you more information about the performance aspects of the DS8000 family.

1.5 Summary

In this chapter we gave you a short overview of the benefits and features of the new DS8000 series and showed you why the DS8000 series offers:

￿Balanced performance, which is up to six times that of the ESS Model 800

￿Linear scalability up to 192 TB (designed for 1 PB)

￿Integrated solution capability with storage system LPARs

￿Flexibility due to dramatic addressing enhancements

￿Extensibility, because the DS8000 is designed to add/adapt new technologies

￿All new management tools

￿Availability, since the DS8000 is designed for 24x7 environments

￿Resiliency through industry-leading Remote Mirror and Copy capability

￿Low long term cost, achieved by providing the industry’s first 4 year warranty, and model-to-model upgradeability

More details about these enhancements, and the concepts and architecture of the DS8000 series, are included in the remaining chapters of this redbook.

Chapter 1. Introduction to the DS8000 series 15