<p>Ping An Cloud DDS supports two architectures:</p> <ul> <li>3+0+1.1 Architecture</li> </ul> <p>When a DDS instance is created, if the selected region has only one availability zone, the system will create three replica sets in the same availability zone and region by default: one primary node and two secondary nodes, and specifications of computing resources and storage resources of three-node replica sets are the same. There is no citywide disaster recovery instance. Users can create a remote disaster recovery instance according to business requirements. When a remote disaster recovery instance is created, the system will create an arbitration node by default. Specifications of computing resource and storage resource of remote disaster recovery instance are consistent with those of general instances.</p> <p>Remote disaster recovery instance has independent domain name and port number. Relevant information can be obtained from basic information of each instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/mongodb/Manual.Instance_Management.View_Instance.View_Common_Instance" target="_blank">View Basic Information of Instance</a>.</p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20202108140322-1e7c95bf919f.png" style="height:20px; margin:0px; width:80px" />: Port numbers of general instances and remote disaster recovery instances are allocated by the system automatically. They may be same or not and have no direct connections.</p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20202108141327-166b29229f33.png" style="height:529px; width:758px" /></p> <ul> <li>2+1+1.1 Architecture&nbsp;</li> </ul> <p>When a DDS instance is created, if the selected region has two or more availability zones, the system will create three replica sets in the same region in different availability zones by default: one primary node and one secondary node in the same availability zone. One citywide disaster recovery instance is in another citywide availability zone. Specifications of computing resources and storage resources of three-node replica sets are same. Users can create a remote disaster recovery instance according to business requirements. When a remote disaster recovery instance is created, the system will create an arbitration node by default. Specifications of computing resource and storage resource of remote disaster recovery instance are consistent with those of general instances.</p> <p>Remote disaster recovery instance has independent domain name and port number. Relevant information can be obtained from basic information of each instance. For more information, see <a href="http://pinganyun.com/ssr/help/database/mongodb/Manual.Instance_Management.View_Instance.View_Common_Instance" target="_blank">View Basic Information of Instance</a>.</p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20202108140322-1e7c95bf919f.png" style="height:20px; margin:0px; width:80px" />: Port numbers of general instances and remote disaster recovery instances are allocated by the system automatically. They may be same or not and have no direct connections.</p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20202108142618-1e016ca493b8.png" style="height:580px; width:830px" /></p>