title: Need information on Azure Storage - synchronous data replication
body: <p>I am creating a disaster recovery plan for an Azure based application. In this application Azure Storage (BLOB, Gen purpose V2) has been used. We are using REST api to insert data inside the BLOB container. We are using GRS for redundancy. As per Azure documentation, the data is at first copied in the same region in 3 different availability zones synchronously.
  So my question is, when i upload a blob in azure storage using AZURE SDK or Rest api call and receive a success (200-OK) message, is it that the synchronous copy to all 3 availability zones in the same region is completed or only the copy to the first zone is completed and the remaining two are queued.</p>