In the Huawei disaster recovery solution, the correct description of the synchronous remote replication sequence is:

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The main storage array returns a successful write message to the host.

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The primary storage array writes I/O data to the primary LUN and sends IO to the secondary LUN 2.

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The host sends IO to the main storage array.

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Write IO data to the master and slave LUNs.

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1-2->3->4

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1-24->3->2

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2-1-4~3

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3->2-1->4

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