Elastic Compute Service:CreateSnapshot

The instant access feature for snapshots replaces the legacy local snapshot feature. The parameters are described as follows:

• If you used local snapshots before December 14, 2020, you can continue to use the Category parameter.

• If you did not use local snapshots before December 14, 2020, no additional configuration is required. New snapshots that are created for ESSD cloud disks (ESSDs, ESSD AutoPL disks, ESSD Entry disks, and zone-redundant ESSDs) have the instant access feature enabled by default. This applies to both manual and automatic snapshots. The instant access-related parameters InstantAccess, InstantAccessRetentionDays, and DisableInstantAccess no longer take effect. The DescribeSnapshots and DescribeSnapshotGroups API operations return an Available parameter that indicates the snapshot's status.

Prerequisites:

• The snapshot feature is enabled. For more information, see Enable the snapshot feature.

• The cloud disk must be in the in-use or available state. Note the following points:

  • If the cloud disk is in the in-use state, the instance to which the disk is attached must be in the running or stopped state.

  • If the cloud disk is in the available state, you can create snapshots for it only if it has been previously attached to an ECS instance.

  • When you use cloud disks to create dynamic scalable volumes or RAID arrays, we recommend that you use snapshot consistency groups and enable application-consistent snapshots to back up data. A snapshot consistency group ensures the crash consistency and write-order consistency of data written across multiple cloud disks. For more information, see Create a snapshot consistency group and Create an application-consistent snapshot.

Keep the following in mind when creating a snapshot:

• Create snapshots during off-peak hours. During snapshot creation, the I/O performance of the cloud disk decreases by less than 10% and read and write operations may temporarily slow down.

• You cannot use a snapshot that is being created to create a custom image (CreateImage).

• The snapshot does not back up incremental data generated on the cloud disk during the creation process.

• If the cloud disk is attached to an ECS instance, do not change the state of the instance, such as stopping or restarting the instance, during snapshot creation. Otherwise, the snapshot creation will fail.

• You cannot resize a cloud disk during snapshot creation. You can resize the cloud disk only after the snapshot is complete.

• You can create a snapshot for a cloud disk that is in the expired (Expired) state. If the cloud disk is released due to expiration when the snapshot is being created, the snapshot in the creating (Creating) state is also deleted.

• After a snapshot is created, you are charged for the snapshot based on its size. The fees are settled on a per-region basis. For more information, see Snapshots.

• You cannot create a snapshot for a cloud disk in the following cases:

  • The number of manual snapshots of the cloud disk has reached the upper limit. For more information, see Limits.

  • The limit on the number of snapshots that can be created concurrently has been reached. For more information, see Limits.

  • When you query the information of an ECS instance, if the returned data contains {"OperationLocks": {"LockReason" : "security"}}, all operations on the instance are prohibited.