Can I Change the Specifications Defined by a Private Image When I Use the Image to Create an ECS?

Yes. You can specify the CPU, memory, bandwidth, system disk, and data disks of the ECS you are creating. The system disk must be at least as large as the system disk capacity in the image, and must be smaller than 1,024 GiB.

If you create an ECS from a private full-ECS image that contains one or more data disks, the system automatically sets the data disk parameters for the ECS. You can increase the capacity of a system disk or data disks, but cannot decrease it.

For details, see Creating an ECS from an Image.