Overview

Scenarios

You can resize the storage capacity of a single instance in the following ways:

• Resize an existing cloud disk. You need to resize an existing partition or a new partition.
• Create a new cloud disk, attach it to the instance as a data disk, and then partition or format the disk.
• Change a system disk and specify a higher system disk capacity.

This topic describes the thresholds of extended disks and how to resize an existing cloud disk.

Thresholds of extended system disks

The new capacity value must be greater than the existing capacity of the system disk, but equal to or less than 500 GiB. The following table describes the thresholds of extended system disks for different images.

For example, the current capacity of the system disk of a CentOS instance is 35 GiB. After you resize the system disk, its capacity must be equal to or greater than 35 GiB, but equal to or less than 500 GiB.

Thresholds of extended data disks

The new value must be greater than the existing capacity of the data disk. The following table lists the data disk resizing limits for different cloud disk categories.

Resize a cloud disk

1. Log on to the console or use the API (ResizeDisk) to resize a cloud disk.
2. Log on to the console or use the API (RebootInstance) to restart an instance.
3. Remote access the instance and resize the partition and file system:

   Before you resize the cloud disk	After you resize the cloud disk (GiB)	Resize the partition and file system
   Not partitioned	< 2,048	Partition or format a Windows data disk Partition or format a Linux data disk
   	≥ 2,048	Partition or format a data disk of more than 2 TiB
   Partitioned	< 2,048	Resize a file system of a Windows disk Resize a file system of a Linux system disk Resize a file system of a Linux data disk
   	≥ 2,048	For the GPT partition format: Resize a file system of a Windows disk Resize a file system of a Linux system disk Resize a file system of a Linux data disk For the MBR partition format: You cannot resize the partition Note If you want to resize a cloud disk to more than 2,048 GiB, the cloud disk cannot use the MBR partition format. In this case, you must first query the partition format of the cloud disk. If the MBR partition format is used, we recommend that you create and attach another data disk. Format a GPT partition and copy the data in the MBR partition to the GPT partition.