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278 DS8000 Series: Concepts and Architecture
12.6 Summary
This high performance processor complex configuration is the base for a maximum of host I/O
operations per second. The DS8000 Model 921 dual 2-way complex can handle an I/O rate of
what about three to four ESS 800s can deliver at maximum speed. This allows you to
consolidate three to four ESS 800s into a DS8100. As we saw before, the DS8000 series
scales very well and in a linear fashion. Moving on from a 921 dual 2-way processor complex
to a 922 dual 4-way processor complex not only doubles the number of POWER5
processors, but also doubles the performance. A properly configured DS8300 allows the
same maximum number of host I/O operations per second as what up to six to eight ESS
800s provide.
With the introduction of the smart, switch-based Fibre Channel disk back end to overcome
the FC-AL arbitration overhead, the DS8000 provides a comprehensive technology and an
unmatched architecture to fulfill very demanding performance requirements, and it provides
the highest RAS standards in the industry. This goes along with the 2 Gbps Fibre Channel
device adapters (DA). The stage is set for a new record of aggregated bandwidth and I/O
rates to the DS8000 high performance disk storage server family. A very promising road map
guarantees a bright future for the DS8000 series.