1. Log in to the CVM console.
2. Locate the CVM on which you want to expand the data disk, and select More > Resource Adjustment > Expand Data Disk in the Operation column.
3. Select the data disk to be expanded in the pop-up window, and click Next.
4. Select a new capacity (it must be greater than or equal to the current capacity) and click Next.
5. Read the notes and click Adjust Now.
6. Assign its expanded capacity to an existing partition, or format it into an independent new partition. Depending on the operating system of the CVM, see Extending Partitions and File Systems (Windows) or Determining the Expansion Method.

1. Log in to the CBS console.
2. Locate the cloud disk to be expanded, and select More > Expand in the Operation column.
3. Select a new capacity. It must be greater than or equal to the current capacity.
4. Complete the payment.
5. Assign its expanded capacity to an existing partition, or format it into an independent new partition. Depending on the operating system of the CVM, see Extending Partitions and File Systems (Windows) or Determining the Expansion Method.

You can use the ResizeDisk API to expand the specified cloud disks. For more information, see ResizeDisk.

1. Log in to a Linux instance
2. Run the following command to view the relationship between the elastic cloud disks and the device name.
   

   ls -l /dev/disk/by-id
   ​

   The following information will appear:
   
   Note that disk-xxxx is the ID of a cloud disk. You can use it to view cloud disk details on the CBS console.

1. Log in to a Windows instance.
2. Right click , and select Run.
3. Enter cmd in the pop-up window and press Enter.
4. Run the following command to view the relationship between the elastic cloud disks and the device name.
   

   wmic diskdrive get caption,deviceid,serialnumber
   

   You can also run the following command.

wmic path win32_physicalmedia get SerialNumber,Tag
​

After the system disk is expanded, log in to the Linux instance and check whether the /etc/cloud/cloud.cfg file contains the growpart and resizefs configuration items.

• If yes, ignore other operations.
  
  • growpart: expands the partition to the disk size.
  • resizefs: expands or adjusts the file system in the / partition to the partition size.
• If no, manually extending partitions and file systems (Linux) according to the operating system, and assign its expanded capacity to an existing partition, or format it into an independent new partition.

After the system disk is expanded, log in to the Windows instance and check whether the ExtendVolumesPlugin configuration item exists under plugin in C:\Program Files\Cloudbase Solutions\Cloudbase-Init\conf\cloudbase-init.conf.

• If yes, ignore other operations.
• If no, manually extending partitions and file systems (Windows) according to the operating system, and assign its expanded capacity to an existing partition, or format it into an independent new partition.