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Chapter 1. Introduction to the DS8000 series 15
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.