You can create a separate pay-as-you-go disk, and then attach the disk to an instance as a data disk.

Prerequisites

  • The target instance and the disk are in the same zone.
  • The target instance is in the Running (Running) or Stopped (Stopped) state, not in the Locked (Locked) state.
  • The disk is in the Unattached (Available) state.
  • You have no overdue payments in your account.

Background information

Take note of the following items before you attach a disk:
  • Disks that are created with instances and subscription data disks that are created for subscription instances are automatically attached to the corresponding instances. You do not need to manually attach the disks.
  • You can attach a maximum of 16 data disks to an ECS instance.
  • A disk can be attached only to a single instance.
Note The attach operation refers to attaching disks to ECS instances in the console, instead of mounting file systems to the operating systems of ECS instances by running the mount command. For information about how to format data disks and mount file systems, see Format a data disk for a Linux instance and Format a data disk for a Windows ECS instance.
You can also attach disks on the Instances or Disks page.
  • If you want to attach multiple disks to an ECS instance, we recommend that you perform the operation on the Instances page. For more information, see Attach disks on the Instances page.
  • If you want to attach multiple disks to different ECS instances, we recommend that you perform the operation on the Disks page. For more information, see Attach disks on the Disks page.

Attach disks on the Instances page

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Instances & Images > Instances.
  3. In the top navigation bar, select a region.
  4. Find the target instance and click the ID of the instance.
    Attach a data disk
  5. In the left-side navigation pane, click Disks. On the Disks page, click Attach Disk in the upper-right corner.
    Attach Disk
  6. Configure the following parameters in the dialog box:
    Attach
    1. Select the target disk and specify the release settings for the disk.
      • Target Disk: Select a disk that is in the same zone as the instance and is in the Unattached state from the drop-down list.
      • Release Disk with Instance: If you do not select this option, the disk will be retained when the instance is released.
        Note If the disk that you want to attach is a system disk that you detached from another instance, the instance specified by Release Disk with Instance refers to the instance from which you detached the disk, not the current instance.
      • Delete Automatic Snapshots While Releasing Disk: If you select this option, automatic snapshots of the disk will be released when the disk is released. We recommend that you do not select this option to retain backup data.
    2. Click OK.
    3. Click Attach.
    If the state of the disk becomes In Use, the disk is attached.
  7. Before you can use the disk, perform the following operations based on the status of the disk and the operating system of the instance.
    Disk status Operating system What to do next
    New empty disks Linux For more information about operations on disks smaller than 2 TiB, see Format a data disk for a Linux instance. For more information about operations on disks larger than 2 TiB, see Partition and format a data disk larger than 2 TiB.
    Windows Server For more information about operations on disks smaller than 2 TiB, see Format a data disk for a Windows ECS instance. For more information about operations on disks larger than 2 TiB, see Partition and format a data disk larger than 2 TiB.
    Disks created from snapshots Linux Connect to the instance and run the following command to mount the disk partitions that have available file systems:
    mount <Data disk partition> <Mount point>
    Windows Server N/A

Attach disks on the Disks page

  1. Log on to the ECS console.
  2. In the left-side navigation pane, choose Storage & Snapshots > Disks.
  3. In the top navigation bar, select a region.
  4. Find the target disk in the Unattached state and choose More > Attach in the Actions column.
    Attach a disk on the Disks page
  5. Configure the following parameters in the dialog box:
    Attach
    1. Select the target disk and specify the release settings for the disk.
      • Target Instance: Select an ECS instance that is in the same zone as the disk.
      • Release Disk with Instance: If you do not select this option, the disk will be retained when the instance is released.
        Note If the disk that you want to attach is a system disk that you detached from another instance, the instance specified by Release Disk with Instance refers to the instance from which you detached the disk, not the current instance.
      • Delete Automatic Snapshots While Releasing Disk: If you select this option, automatic snapshots of the disk will be released when the disk is released. We recommend that you do not select this option to retain backup data.
    2. Click Attach.
    If the state of the disk becomes In Use, the disk is attached.
  6. Before you can use the disk, perform the following operations based on the status of the disk and the operating system of the instance.
    Disk status Operating system What to do next
    New empty disks Linux For more information about operations on disks smaller than 2 TiB, see Format a data disk for a Linux instance. For more information about operations on disks larger than 2 TiB, see Partition and format a data disk larger than 2 TiB.
    Windows Server For more information about operations on disks smaller than 2 TiB, see Format a data disk for a Windows ECS instance. For more information about operations on disks larger than 2 TiB, see Partition and format a data disk larger than 2 TiB.
    Disks created from snapshots Linux Connect to the instance and run the following command to mount the disk partitions that have available file systems:
    mount <Data disk partition> <Mount point>
    Windows Server N/A

What to do next

After the disk is in use, you can perform the following operations.
Business requirement What to do next
Resize the disk
Back up disk data
Restore the disk to its initial status Reinitialize a data disk
Restore the disk to its status at a specific point of time Roll back a disk
Release unneeded pay-as-you-go disks to minimize costs
  1. Detach a data disk
  2. Release a disk