What Are the Restrictions When I Attach a DSS Disk to an ECS?

The DSS disk and the target ECS must be located in the same AZ.
For a non-shared disk, the DSS disk must be in Available state.
For a shared disk, the target ECS must be in the In-use or Available state.
The target ECS must be in Running or Stopped state.
A frozen DSS disk cannot be attached to an ECS.
A SCSI DSS disk cannot be used as an ECS system disk.
For ECSs charged in yearly/monthly mode:
If you detach the system disk purchased when you buy an ECS and want to continue using it as a system disk, you can only attach it to an ECS that has the same specifications as those of 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 purchased when you create an ECS and want to attach it again, you can only attach it to the original ECS as a data disk.

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