IBM DS6000 - Manual (Page 359)

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Chapter 25.
Global Mirror performance and
scalability
This chapter discusses performance considerations for planning and configuring Global
Mirror for DS6000. It also explains the potential impact that the three phases of Consistency
Group formation might have on application write I/Os. Finally, it covers the distribution of
B volumes and C volumes across different ranks, and how to provide extra care for very busy
volumes.
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