What Are the Requirements for Attaching an EVS Disk to an ECS?

The EVS disk and the target ECS must be located in the same AZ.
The target ECS must be in Running or Stopped state.
The EVS disk must not be frozen.
For yearly/monthly ECSs:
If you detach the system disk that you purchased when creating an ECS and want to continue using it as a system disk, you can only attach it to the original ECS. If you want to use it as a data disk, you can attach it to any ECS.

If you detach the non-shared data disk that you purchased when creating an ECS and want to attach it again, you can only attach it to the original ECS as a data disk.

Parent topic: Disk Partition, Attachment, and Expansion FAQ

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