Match Dual Personally SRDF device to its usage SRDF role

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Match Dual Personally SRDF device to its usage SRDF role.

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Answer:

Explanation:

SRDF device used for Concurrent SRDF environments = R21 SRDF device used for SRDF/Star environments = R11 SRDF device used for Cascaded SRDF environments = R22

A dual personality SRDF device is a device that can act as both an R1 and an R2 device in different SRDF configurations. There are three types of dual personality SRDF devices: R21, R11, and R22.

An R21 device is an R2 device that is paired with another R1 device in a different SRDF group. This allows the R21 device to receive updates from the primary site and send updates to the secondary site. An R21 device is used for Concurrent SRDF environments, which provide simultaneous disaster recovery and data migration capabilities. For example, an R21 device can be used to migrate data from one array to another while maintaining a synchronous copy of the data on a third array.1

An R11 device is an R1 device that is paired with another R1 device in a different SRDF group. This allows the R11 device to receive updates from the primary site and send updates to the tertiary site. An R11 device is used for SRDF/Star environments, which provide three-site disaster recovery capabilities with a single hop between any two sites. For example, an R11 device can be used to create a synchronous copy of the data on a secondary site and an asynchronous copy of the data on a tertiary site.2

An R22 device is an R2 device that is paired with another R2 device in a different SRDF group. This allows the R22 device to receive updates from the secondary site and send updates to the tertiary site. An R22 device is used for Cascaded SRDF environments, which provide three-site disaster recovery capabilities with two hops between the primary and tertiary sites. For example, an R22 device can be used to create an asynchronous copy of the data on a secondary site and another asynchronous copy of the data on a tertiary site.3

Reference:

Dell EMC SRDF Introduction – Dell Technologies Partner Portal Dell EMC PowerMax and VMAX All Flash: SRDF Product Guide Dell EMC PowerMaxOS Performance Guide