Prerequisites
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Existing mated pair setup on CPS 18.2.0.
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IPv6 relay based on IPv6 address ranges is already configured to relay Rx AARs to sites D1/D2 or D3/D4 or D5/D6 based on IPv6 pools (D1, D3, D5 should be the primaries during migration).
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Set BindingExpiryTimer to very large value (3 months) at all sites. It is recommended to be done 1 week before migration window so that the existing bindings are updated.
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On CPS 18.2.0 master/control VMs, data disks are present and /data is mounted on it.
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Application call flows are executed, and calls are running fine.
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Make sure there is no NTP and connectivity related issues across the sites.
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All the new database VMs that will be later deployed on all the sites should be accessible to all the worker VMs.
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Decide the statistics partition size as per the customer requirements.