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Detaching a Data Disk

Updated on 2022-12-20 GMT+08:00

Scenarios

Data disks can be detached online or offline, which means that the server containing the to-be-detached data disk can either be in the Running or Stopped state.
  • ECS

    Detach a disk online. For details, see Storage > Detaching an EVS Disk from a Running ECS in the Elastic Cloud Server User Guide.

  • BMS

    SCSI disks can be attached to BMSs and used as data disks. You can detach a data disk either from a running or stopped BMS.

For a data disk attached to a server, the disk function is displayed as Data disk, and the disk status is displayed as In-use in the disk list. After the data disk has been detached from the server, the disk function remains unchanged, the disk status changes to Available for a non-shared data disk, and the disk status changes to Available for a shared data disk after it is detached from all its servers.

Prerequisites

  • Before detaching an EVS disk from a running Windows ECS, ensure that no program is reading data from or writing data to the disk. Otherwise, data will be lost.
  • Before detaching an EVS disk from a running Linux ECS, you must log in to the ECS and run the umount command to cancel the association between the disk and the file system. In addition, ensure that no program is reading data from or writing data to the disk. Otherwise, detaching the disk will fail.

Detaching a Non-shared Disk

  1. Log in to the management console.
  2. Under Storage, click Elastic Volume Service.

    The disk list page is displayed.

  3. Determine whether to view the server information before detaching the disk.

    • If you need to view the server information, perform the following procedure:
      1. In the disk list, click the name of the to-be-detached disk.

        The disk details page is displayed.

      2. Click the Servers tab to view the server where the target disk has been attached.
      3. Click to select the server and click Detach Disk.

        The Detach Disk dialog box is displayed.

      4. Click Yes to detach the disk.
    • If you do not need to view the server information, perform the following procedure:
      1. In the disk list, locate the row that contains the target disk and choose More > Detach in the Operation column.

        The Detach Disk dialog box is displayed.

      2. Click Yes to detach the disk.

    The disk list is displayed. The disk status is Detaching, indicating that the disk is being detached from the server.

    When the status changes to Available, the disk is successfully detached.

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