Migrating ECSs Across AZs

Scenarios

Migration Center (MgC) provides a single place for you to easily migrate, modernize, and optimize your applications using tools built based on Huawei Cloud migration methodologies and best practices. With MgC, you can create a migration workflow quickly and easily based on different migration scenarios.

You can use the cross-AZ migration function of MgC to efficiently and visually migrate resources and switch services between AZs. This section describes how to migrate ECSs across AZs on the ECS console.

Preparations

Prepare a HUAWEI ID or an IAM user that has required permissions to use MgC. For details, see Preparations.
On the MgC console, create an independent project for the migration and select Application migration for Project Type. For details, see Managing Projects.
On the MgC console, create an application for the migration. Choose Cross-AZ migration > Cross-AZ migration for Business Scenario, set Target Region to the destination region, and Target AZ to the AZ where ECSs will be migrated. For details, see Creating an Application.

Constraints

Servers whose system disk is greater than 1 TB cannot be migrated.
Frozen servers in the retention period cannot be migrated.

After the migration is complete, the passwords of Linux servers remain unchanged, but those of Windows servers will be changed. For details, see Are There Any Precautions I Need to Take When Performing a Cross-AZ Migration?
For details about the regions that support cross-AZ ECS migration, see Region Availability.

For more constraints about cross-AZ migration, see Cross-AZ Server Migration.

Procedure

Log in to the ECS console and access the ECS list page.
Click in the upper left corner and select a region and project.
In the Operation column of the ECS to be migrated, choose More > View O&M and Monitoring > Migrate Across AZs.
The Migration Center (MgC) page is displayed.
In the left navigation pane, select the created project for application migration from the drop-down list.

Configure cross-AZ migration for ECSs.

The table below lists the steps for configuring cross-AZ migration. For details, see Migrating Servers Across AZs on Huawei Cloud.

**Table 1** Configuring cross-AZ migration
Step	Description
Step 1: Discover servers in the source AZ	On the Cloud Discovery page, if you select an application from the Application (Optional) drop-down list in the Basic Information area, all discovered servers will be grouped into the application. If you only want to migrate a specified ECS, go to the next step. You do not need to specify Application (Optional) here.
Step 2: Group servers as an application	Select the servers to be grouped as an application.
Step 3: Get target recommendations	Assess the servers grouped into an application. If the assessment fails, you can click Modify Target Configuration to manually update the specifications, disk type, and disk storage for a target server.
Step 4: Create a cross-AZ migration workflow	Create a cross-AZ migration workflow and migrate the servers as instructed.