Notes and Constraints

Maximum number of private images that can be created in a region

50

If you need more, submit a service ticket to increase your quota.

Maximum number of concurrent tasks for creating private images

40

Creating a system disk image from an ECS

• The ECS must be in the Stopped or Running state.

Creating a data disk image from an ECS

• The ECS must be in the Stopped or Running state.
• A data disk image can be used to create only one data disk at a time.

Disk capacity

• The system disk capacity must be no greater than 1 TiB. If the capacity is greater than 1 TiB, system disk images cannot be created. Only full-ECS images can be created.
• The data disk capacity must be no greater than 1 TiB. If the capacity is greater than 1 TiB, data disk images cannot be created. Only full-ECS images can be created.

Creating a full-ECS image from an ECS or a CBR backup

• The ECS must be in the Stopped or Running state.
• A CSBS or CBR backup can be used to create only one full-ECS image at a time.
• Only full-ECS images created from CBR backups can be shared. Other full-ECS images cannot be shared.
• A full-ECS image cannot be replicated within a region or be exported.

Importing a system disk image through an image file

For details about constraints on external image files, see Preparing an Image File or Preparing an Image File.

Importing a system disk image through an ISO file

• Register the ISO file as an ISO image, use the ISO image to create a temporary ECS, install an OS and related drivers on the ECS, and use the ECS to create a system disk image.
• The ISO image cannot be replicated, exported, or encrypted.

Importing a data disk image through an image file

The data disk capacity can be 40–2048 GiB, and it must also be at least as big as the data disk in the image file.

Image format

VMDK, VHD, QCOW2, RAW, VHDX, QED, VDI, QCOW, ZVHD2, and ZVHD

Image size

The image size cannot exceed 128 GiB.

If the image size is between 128 GiB and 1 TiB, convert the image file into the RAW or ZVHD2 format and import the image through fast import.

• For details about how to convert the image file format, see image format conversion.
• For details about fast import, see Fast Import of an Image File.

Maximum number of tenants an image can be shared with

System disk image or data disk image: 128

Full-ECS image: 10

Maximum number of shared images that a tenant can receive

No limit

Private image status

Normal

Image sharing

• Encrypted images cannot be shared.

Region

• There are constraints on the region when cloud servers are created from a shared image. For example, a shared image can be used to create cloud servers only in the same region.

Maximum size of an image

128 GiB

Maximum number of concurrent replication tasks per tenant

5

Private image status

Normal

Replicating images within a region

• Full-ECS images cannot be replicated within the same region.
• Private images created using ISO files do not support in-region replication.
• The size of an image to be replicated within a region cannot be greater than 128 GiB.

Maximum size of an exported image

1 TiB

Images larger than 128 GiB only support fast export.

For details about fast export, see What Are the Differences Between Standard and Fast Import/Export?

Formats of exported image files

VMDK, VHD, QCOW2, ZVHD, and ZVHD2

Private image status

Normal

Exporting an image

• An image can only be exported to a Standard bucket that is in the same region as the image.
• The following private images cannot be exported:
  • Full-ECS images
  • ISO images
  • Private images created from a Windows, SUSE, Red Hat, Ubuntu, or Oracle Linux public image
  NOTE:

  • Fast export is unavailable for encrypted images. To export an encrypted image, decrypt it first.

Encrypting an image

Creating an encrypted image from an encrypted ECS or an external image file

• An image encrypted using the default key cannot be shared with other tenants.
• The key used for encrypting an image cannot be changed.

Deleting images

Private image status

A private image published to KooGallery cannot be deleted.

Creating cloud servers from an image

Number of cloud servers that can be concurrently created using a system disk image

Recommended value: ≤ 100

Tagging an image

Maximum number of tags that can be added to a private image

10