Many enterprise customers want to take advantage of the ease of scalability and cost efficiency of public cloud storage to implement fast migration to the cloud. These customers also demand high storage performance and stability. They want sensitive data to be stored on on-premises physical devices to meet company policies or regulatory requirements. Hybrid Cloud Storage Array (HCSA) is specifically designed for these customers. HCSA combines the cost efficiency and scalability of public cloud storage with the architecture of data centers to help the customers achieve the seamless flow of data between data centers and Alibaba Cloud.