Scenarios
Snapshots are an important method for data sharing and migration. A cloud disk created from a snapshot contains all the data in the snapshot. You can use a snapshot to create a cloud disk with a capacity equal to or greater than that of the snapshot.
- When you use a snapshot to create a data disk of the same size, the new data disk does not need to be initialized. You can mount it directly and right-click > Disk Management. After it is connected to the CVM in Disk Management, it can be read and written normally.
- When you use a snapshot to create a data disk with a capacity larger than the snapshot, the system only completes the disk expansion at the block device level and does not extend the file system or convert the partition format automatically. After a new data disk is attached, only the file system and data from the source snapshot can be used, and the new disk space cannot be directly used. You need to manually extend the file system or even convert the partition format.
For example, use a data disk snapshot with an MBR partition format and a capacity of 1TB to create a new 3TB data disk. Since the maximum disk space supported by MBR is 2TB, you need to format the data disk and repartition it using GPT, which deletes the original data. Therefore, please operate with caution according to your actual needs.
This document describes how to create a cloud disk from a snapshot group on the snapshot group list page. Additionally, when creating a cloud disk, you can configure the snapshot parameter to specify the corresponding snapshot for creating a cloud disk.
Operation Steps
Creating Cloud Disks from Snapshot Groups Using the Console
- Log in to the CBS console.
- In the left sidebar, select Snapshot > Snapshot List.
- On the Snapshot Group tab, select More > Create Cloud Disk in the row containing the target snapshot group.
- In the Purchase Data Disk dialog box, set the following parameters:
| Parameter | Parameter Description |
|---|---|
| Disk name | This parameter is optional. The name of cloud disk supports up to 20 characters. After the cloud disk is created, it can be modified. - Create a single cloud disk: The disk name is the name of the cloud disk. - Create cloud disks in batches: When multiple cloud disks are created at a time, the disk name is the prefix of the cloud disk name. The final cloud disk name is in the format of disk name_number, from hard disk name_0 to hard disk name_49. |
| Project | This parameter is required. When creating a cloud disk, you can set the project it belongs to. The default project is Default Project. |
| Tag | This parameter is optional. You can bind tags to cloud disks when creating them. Tags are used to identify cloud resources and enable classification and search of cloud resources. |
- The default billing mode is Pay-as-you-go. You can view the newly created fee and click OK.
- You can check the created cloud disk on the Cloud Block Storage page. The new elastic cloud disk is in the To be mounted state. To attach it to a CVM instance in the same AZ, see Attaching Cloud Disks .