Why Can't I Detach My Disk?

EVS disks can be used as system disks or data disks, but the way you detach each one is different.

• EVS disks cannot be detached from HECS L instances.
• In Linux, a system disk is typically mounted on /dev/vda. In Windows, a system disk is normally Volume (C:).
• In Linux, a data disk is typically mounted on a mount point other than /dev/vda. In Windows, a data disk is normally a volume other than Volume (C:).

• System disks: A system disk can only be detached offline. You must first stop the server that uses this system disk and then detach the disk.
• Data disks: A data disk can be detached regardless of whether it is offline or online.
  • Offline detachment: The server must be in the Stopped state. If it is not, stop the server and then detach the data disk.
  • Online detachment: Some OSs support online detachment. In this case, you do not need to stop the server before detaching the data disk. For more information, see Detaching an EVS Disk from a Running ECS.