Modifying Individual ECS Specifications

Scenarios

If ECS specifications do not meet service requirements, you can modify the ECS specifications, including vCPUs and memory. Certain ECSs allow you to change their types when you modify their specifications.

Notes

• The ECS needs to be stopped during the the specification modification, so you are advised to perform this operation during off-peak hours.
• During the specification modification, do not perform any operation on the ECS, such as stopping or restarting the ECS. Otherwise, the modification will fail.
• When modifying the specifications of an ECS, sold-out vCPU and memory resources are unavailable for selection.
• Downgrading ECS specifications (vCPU or memory) will reduce performance.
• Certain ECS types do not support specifications modification currently. For details about available ECS types and functions, see ECS Types. For details about restrictions on using different types of ECSs, see their notes.
• When the disk status is Expanding, you are not allowed to modify the specifications of the ECS where the disk is attached.
• Before modifying specifications, make sure that the ECS has been stopped.
• For yearly/monthly ECSs that use paid images, the instance specifications cannot be downgraded. This means you cannot change the specifications to lower-cost ones.

Preparations

After ECS specifications are modified, NIC flapping may occur. Before modifying the specifications, perform the following operations:

NIC flapping occurs because NIC retaining is enabled in the image from which the ECS is created.

For more information about NIC flapping, see What Should I Do If NIC Flapping Occurs After My ECS Specifications Are Modified?

• Linux

  Run the following commands on the ECS to delete the files with persistent and net included in their names in the network rule directory:

  rm -fr /etc/udev/rules.d/*net*persistent*.rules

  rm -fr /etc/udev/rules.d/*persistent*net*.rules

Step 1: Modify Specifications

1. Log in to the management console.
2. Click in the upper left corner and select your region and project.
3. Click . Under Compute, click Elastic Cloud Server.
4. On the Elastic Cloud Server page, view the status of the target ECS.

   If the ECS is not in Stopped state, choose More > Stop in the Operation column.

5. Choose More > Modify Specifications in the Operation column.

   The Modify ECS Specifications page is displayed.

6. Select the new ECS type, vCPUs, and memory as prompted.
7. Click Next.
8. Confirm the modified configurations and click Submit.
9. Check whether the specifications have been modified.

   After modifying the specifications, you can check whether the specifications have been modified in Failures.

   1. Check whether Failures is displayed on the management console. For details, see Viewing Failed Tasks.
      • If yes, go to step 9.b.
      • If no, the specifications have been modified.
   2. Click Failures. Then, in the Failures dialog box, click Operation Failures and check whether the task is contained in the list by Name/ID, Operated At, or Task.
      • If yes, the specifications modification failed. See Follow-up Procedure for failure causes.
      • If no, the specifications have been modified.

Step 2: Check Disk Attachment

After specifications are modified, disk attachment may fail. Therefore, check disk attachment after specifications modification. If disks are properly attached, the specifications modification is successful.

• Linux ECS

  For details, see Why Does the Disk Attachment of a Linux ECS Fail After I Modify the ECS Specifications?

Follow-up Procedure

Perform the following operations in the event of a specifications modification failure:

1. Log in to the management console.
2. Under Management & Deployment, choose Cloud Trace Service.
3. In the navigation pane on the left, choose Trace List.
4. In the Trace Name column, locate the resizeServer event by resource ID.

   The resource ID is the ID of the ECS on which the specifications modification failed.

5. Click View Trace in the Operation column to view the failure cause.

   If the fault cannot be rectified based on logs, contact customer service.