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When using PowerStore’s native asynchronous replication, AppSync creates a snapshot on the local appliance. A sync operation is issued on the replication session to synchronize the data. When the remote snapshot is created, the local snapshot is removed.
It is important to understand how AppSync responds to different states of replication with PowerStore. If a replication session is already synchronizing and AppSync issues a sync call, it waits for the operation to complete and then creates a copy. If a session is still in the initializing state, AppSync copy creation fails at the validation stage. PowerStore recognizes that synchronization is allowed when a replication session is in one of the following states: OK or System_Paused. Copy creation can fail in AppSync if the replication session is in a System_Paused state due to any hardware or back-end issues on the appliance. In this case, check the appliance for messages. AppSync allows OK, System_Paused, and Synchronizing as valid states for copy creation. Any other state results in validation failure. Service plans and repurposing workflows also fail.