Help Center > > Getting Started> Configuring Cross-AZ DR for Servers> Step 2: Create a Protected Instance

Step 2: Create a Protected Instance

Updated at: Apr 30, 2020 GMT+08:00

Scenarios

You can create protected instances using the servers that you want to perform DR protection. If the current production site encounters an unexpected large-scale server failure, you can call the related protection group API to perform a failover, ensuring that services running on protected instances are not affected.

Select a protection group for each server to be replicated and create a protected instance using the server. When you create a protected instance, the server and disk will be created at the DR site for the production site server and disk. The server specifications can be configured as required. Specifically, the specifications of the DR site server can be different from those of the production site server. The disks of the production site and DR site are of the same specifications and can automatically form a replication pair.

The server at the DR site is in the Stopped state after the protected instance created. These automatically created resources, including the DR site servers and disks, cannot be used before a planned failover or failover.

Figure 1 Creating a protected instance

Notes

  • If a production site server has been added to an ECS group, you are not allowed to specify a DeH to create the DR site server for the production site server.
  • When a protected instance is created, the default name of the server at the DR site is the same as that of the server at the production site, but their IDs are different.
  • To modify a server name, switch to the protected instance details page and click the server name to switch to the server details page.
  • After you create a protected instance and enable protection for the protection group, modifications to the Hostname, Name, Agency, ECS Group, Security Group, Tags, and Auto Recovery configurations of the production site server will not synchronize to the DR site server. You can log in to the management console and manually add the configuration items to the servers at the DR site.
  • If protection is enabled for servers created during capacity expansion of an Auto Scaling (AS) group, these servers cannot be deleted when the capacity of the AS group is reduced.
  • If the server at the production site runs Windows and you choose the key login mode, ensure that the key pair of the server exists when you create a protected instance. Otherwise, the server at the DR site may fail to create, causing the protected instance creation failure.

    If the key pair of the server at the production site has been deleted, create a key pair with the same name.

  • When you create a protected instance, if the production site server runs Linux and uses the key login mode, the key pair information will not be displayed on the details page of the DR site server after the DR site server is created. You can use the key pair of the production site server to log in to the DR site server.
  • If the production site server is added to Enterprise Project, the created DR site server will not be automatically added to Enterprise Project. You need to manually add it to Enterprise Project if needed.

Prerequisites

  • The protection group is in the Available or Protecting state.
  • No protected instances have been created for the production site server.
  • Resources of the target specifications for the server to be protected are not sold out at the DR site.
  • The server that you use to create a protected instance and the protection group are in the same VPC.

Procedure

  1. Log in to the management console.
  2. Click Service List and choose Storage > Storage Disaster Recovery Service.

    The Storage Disaster Recovery Service page is displayed.

  3. In the pane of the protection group for which protected instances are to be added, click Protected Instances.

    The operation page for the protection group is displayed.

  4. On the Protected Instances tab, click Create Protected Instance.

    The Create Protected Instance page is displayed.

  5. Configure the basic information about the protected instance, as described in Table 1.

    Table 1 Parameter description

    Parameter

    Description

    Example Value

    Protection Group Name

    Indicates the name of the protection group to which the protected instance to be created belongs. You do not need to configure it.

    protection_group_001

    Protection Group ID

    Indicates the ID of the protection group to which the protected instance to be created belongs.

    2a663c5c-4774-4775-a321-562a1ea163e3

    DR Direction

    Indicates the replication direction of the protection group to which the protected instance to be created belongs. You do not need to configure it.

    -

    Production Site

    Indicates the AZ of the production site server. You do not need to configure it.

    az-01

    Deployment Model

    Indicates the deployment model of the protection group to which the protected instance to be created belongs. You do not need to configure it.

    VPC migration

    VPC

    Indicates the VPC of the protection group to which the protected instance to be created belongs. You do not need to configure it.

    vpc1

    Production Site Server

    This parameter is mandatory.

    In the server list, select the server and specifications to be used to create the protected instance.

    • You can select a maximum of five production site servers at a time.
    • If a shared disk is attached to a server, you need to select all servers to which the shared disk is attached.
    NOTE:
    • If Server Type of the protection group is ECS, select the DR site server specifications. The specifications of the production site server and DR site server can be different. Select the specifications from the DR Site Server Specifications drop-down list.

    ecs-test > s3.small.1

    DR Site Server

    This parameter is mandatory when Server Type of the protection group is ECS.

    You can select to use ECSs to create DR site servers or to deploy DR site servers on DeHs.

    DeHs are physical hosts dedicated for a specified user. You can create servers on a DeH to enhance isolation, security, and performance of your ECSs.

    NOTE:

    If a production site server has been added to an ECS group, you are not allowed to specify a DeH to create the DR site server for the production site server.

    ECS

    DeH

    This parameter is mandatory when DR Site Server is set to DeH.

    Select a DeH for deploying the DR site server. If multiple production site servers are selected, the DR site servers will be created on the same DeH.

    deh-01

    DR Site VPC

    Indicates the VPC of the DR site server.

    Its value is the same as the VPC value and do not need to be configured.

    vpc1

    DR Site Primary NIC

    This parameter is optional.

    Indicates the primary NIC on the DR site server.

    You can use the primary NIC automatically allocated by the system or specify a primary NIC based on your network plan.

    After your select a NIC, select an available subnet from the drop-down list and configure the private IP address.

    NOTE:

    You cannot specify the IP addresses if you create multiple protected instances at a time.

    subnet-01 (192.168.0.0/24)

    DR Site Disk

    This parameter is mandatory.

    The following two options are available:
    • EVS
    • DSS

      If you select DSS for DR Site Disk, Storage Pool is mandatory.

    EVS

    Storage Pool

    • If you select EVS for DR Site Disk, Storage Pool is not required.
    • If you select DSS for DR Site Disk, Storage Pool is mandatory.

    dss-01

    Protected Instance Name

    This parameter is mandatory.

    Enter the protected instance name. It is used for protected instance classification and search.

    Protected-Instance-test

    DR Site Disk and Storage Pool are available only when DSS is enabled.

  6. Click Create Now.
  7. On the Confirm page, you can confirm the protected instance information.

    • If you do not need to modify the information, click Submit.
    • If you need to modify the information, click Previous.

  8. Click Back to Protection Group Details Page and view the protected instances of the protection group.

    If the protected instance status changes to Available or Protecting, the protected instance has been created successfully.

    After a protected instance is created, the system automatically creates replication pairs for the disks of the protected instance and backs up all the disks.

    Query the replication pairs.

    1. Switch to the operation page for the protection group.
    2. Click the Replication Pairs tab.

      On this tab, you can query the statuses of the replication pairs, target protected instance, and production site disk.

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