Scenario

This section describes how to create a CDM cluster to migrate data between an on-premises MySQL database and DWS.

Prerequisites

You have obtained the region, VPC, subnet, and security group of the data warehouse cluster.

Procedure

1. Log in to the CDM management console.
2. Click Buy CDM Cluster. The page for buying a CDM cluster is displayed. The following is a cluster configuration example:
   • Region: Select the region where the CDM cluster resides. Resources in different regions cannot communicate with each other. The region must be the same as that of the data warehouse cluster.
   • AZ: An AZ is a physical region where resources use independent power supply and networks. AZs are physically isolated but interconnected through an internal network. Select AZ2.
   • Name: The cluster name must start with a letter and contains 4 to 64 characters consisting of letters, digits, hyphens (-), and underscores (_). It cannot contain special characters. For example, cdm-aff1.
   • Version: Retain the default value.
   • Instance Type: Select an instance flavor based on your service data volume.
     • cdm.large: 8 vCPUs and 16 GB of memory

       The maximum and assured bandwidths are 3 Gbit/s and 0.8 Gbit/s. Up to 20 jobs can be executed concurrently. This flavor is well suited to migrating a single database table with 10 million pieces of data or more.

     • cdm.xlarge: 16 vCPUs and 32 GB of memory

       The maximum and assured bandwidths are 10 Gbit/s and 4 Gbit/s. Up to 100 jobs can be executed concurrently. This flavor is well suited to TB-level data migration requiring 10GE high-speed bandwidth.

     • cdm.4xlarge: 64 vCPUs and 128 GB of memory

       The maximum and assured bandwidths are both 30 Gbit/s. Up to 300 jobs can be executed concurrently.

   • VPC: Select the VPC where DWS resides.
   • Subnet: You are advised to use the same subnet as that of DWS.
   • Security Group: You are advised to use the security group as that of DWS.

     You can select a subnet and security group that are different from those of DWS. In this case, configure the security group rules to allow the CDM cluster to properly access DWS.

   • Retain the default values for other parameters.

3. Check the current configuration and click Buy Now to go to the page for confirming the order.
   

   You cannot modify the flavor of an existing cluster. If you require a higher flavor, create a cluster with your desired flavor.

4. Click Submit. The system starts to create a CDM cluster. You can view the creation progress on the Cluster Management page.
   

   Generally, it takes 10 to 20 minutes to create a cluster. If you create a CDM cluster for the first time, it takes only one minute to create it.