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.
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 the specifications of a Windows ECS, modify the SAN policy by following the instructions provided in Why Does a Disk Attached to a Windows ECS Go Offline? to prevent disks from going offline after the specifications are modified.

Step 1: Modify Specifications

Log in to the management console.
Under Computing, click Elastic Cloud Server.
Choose More > Modify Specifications in the Operation column.
The Modify ECS Specifications page is displayed.
Select the new ECS type, vCPUs, and memory as prompted.
Before modifying the specifications, stop the ECS or select Authorize ECS auto-stop (The ECS will be automatically stopped when specifications are being modified).
Click Next.
Confirm the settings, read and select the disclaimer, and then click Submit Application.

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.