Dell EMC VMAX - Page 52

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Figure 9. Created
Note: During an NDM migration, the source of the migration will be an R2 or an R21 device (if there is existing SRDF DR
replication from the source device) and the target will be an R1 device. This is different than basic SRDF operations and
is required to allow DR protection during a migration using a cascaded SRDF configuration. See the section entitled
“ADDING DISASTER RECOVERY TO THE TARGET ARRAY” for more details.