Overview

A cloud disk is an expandable storage device on cloud. After a cloud disk is created, you can expand its capacity at any time to increase its storage capacity without losing any data in it.
After a cloud disk is expanded, you need to either assign its expanded capacity to an existing partition, or format it into an independent new partition. For more information, see Extending Partitions and File Systems (Windows) or Extending Partitions and File Systems (Linux).

Note：

MBR partition supports disk with a maximum capacity of 2 TB. When you partition disk with a capacity greater than 2 TB, we recommend that you create and mount a new data disk and use the GPT partition format to copy data.

Expanding Data Disks

If the cloud disk is a data disk, you can expand it using the following three methods.

Note：

If multiple cloud disks of the same capacity and type are mounted to the CVM, you can distinguish them according to the method shown in Distinguishing data disks. Select a data disk and expand its capacity in the following ways.

Expanding data disks via the CVM console (recommended)

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 Extending Partitions and File Systems (Linux).

Expanding data disks via the CBS console

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 Extending Partitions and File Systems (Linux).

Expanding data disks via API

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

Expanding System Disks

If the cloud disk works as a system disk, you can expand it using the following two methods.

Expanding system disks via the CVM console (recommended)

1. Log in to the CVM console. Locate the CVM on which you want to expand the system disk, and select More > Resource Adjustment > Expand System Disk in the Operation column.
2. Select the system disk to be expanded in the pop-up window, and click Next.
3. Select a new capacity (it must be greater than or equal to the current capacity.) and click Next.
4. Read the notes, select Agree to a forced shutdown, and click Adjust Now.
5. After the expansion is completed on the console, check the cloudinit configuration for Linux instances or Windows instances according to the operating system of the CVM. Then extend partitions and file systems as needed.

Expanding system disks by reinstalling the system

You can also expand the system disk by reinstalling the system

Operations

Distinguishing data disks

Check cloud disks according to the operating system of the CVM.

Linux

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 appears:

Note that disk-xxxx is the ID of a cloud disk. You can use it to view cloud disk details on the CBS console.

Windows

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

The following information appears:

Note that disk-xxxx is the ID of a cloud disk. You can use it to view cloud disk details on the CBS console.

Checking the cloudinit configuration

Check the cloudinit configuration according to the operating system of the CVM.

Checking the cloudinit configuration for Linux instances

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 / partition file system 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.

Checking the cloudinit configuration for Windows instances

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.