EMC VMAX 200K - SRDF;AR 2-site Solutions

The time to create the new replicated consistent image is determined by the time that
it takes to replicate the deltas.
SRDF/AR 2-site solutions
The following image shows a 2-site solution where the production device (R1) on the
primary array (Site A) is also a TimeFinder target device:
Figure 47 SRDF/AR 2-site solution
Site A
Host
Site B
R1
R2
TimeFinder
TimeFinder
SRDF
background copy
Host
In the 2-site solution, data on the SRDF R1/TimeFinder target device is replicated
across the SRDF links to the SRDF R2 device.
The SRDF R2 device is also a TimeFinder source device. TimeFinder replicates this
device to a TimeFinder target device. You can map the TimeFinder target device to
the host connected to the secondary array at Site B.
In the 2-site solution, SRDF operations are independent of production processing on
both the primary and secondary arrays. You can utilize resources at the secondary site
without interrupting SRDF operations.
Use SRDF/AR 2-site solutions to:
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Reduce required network bandwidth using incremental resynchronization between
the SRDF target sites.
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Reduce network cost and improve resynchronization time for long-distance SRDF
implementations.
SRDF/AR 3-site solutions
SRDF/AR 3-site solutions provide a zero data loss solution at long distances in the
event that the primary site is lost.
The following image shows a 3-site solution where:
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Site A and Site B are connected using SRDF in synchronous mode.
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Site B and Site C are connected using SRDF in adaptive copy mode.
Blended local and remote replication
SRDF/AR 2-site solutions 161