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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Concurrent operations overview

In a concurrent SRDF configuration, the source R1 device is mirrored to two R2 devices on two different remote arrays.

Figure 1. Concurrent SRDF

The two R2 devices operate independently but concurrently using any combination of SRDF modes.

NOTE:

For Enginuity 5876 or higher, both legs of the concurrent SRDF configuration can be in asynchronous mode

If both R2 mirrors are synchronous:

  • A write I/O from the host at the R1 device side is returned as completed when both remote array' signal that the I/O is in cache at the remote side.

If one R2 is synchronous and the other R2 is adaptive copy:

  • I/O from the R2 operating in synchronous mode must present ending status to the sending array before a second host I/O can be accepted.

    The host does not wait for the R2 operating in adaptive copy mode.

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