In the Huawei disaster recovery solution, the correct description of the synchronous remote replication sequence is:
1. The primary storage array writes I/O data to the primary LUN and sends IO to the secondary LUN
2. 2. The host sends IO to the main storage array.
3. 3. The main storage array returns a successful write message to the host.
4. Write IO data to the master and slave LUNs.
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