Expansion Overview

What Is Capacity Expansion?

If the capacity of an existing disk is insufficient, you can expand the disk capacity to increase the storage space.

Both system disks and data disks can be expanded. A system disk can be expanded to up to 1 TiB, and a data disk to 32 TiB. Disk capacity can only be expanded, not reduced.


If you detach a system disk and then attach it to an ECS as a data disk, the maximum capacity of this disk is still 1 TiB.

How to Expand the Disk Capacity?

A capacity expansion operation includes the following steps:

  1. Expand the disk capacity on the management console.

  2. Log in to the server and extend the disk partition and file system.

**Figure 1** Capacity expansion procedure

Figure 1 Capacity expansion procedure

Expand the Disk Capacity on the Management Console

Choose a proper expansion method based on the disk status.

Log In to the Server and Extend the Disk Partition and File System

After the disk has been expanded on the management console, only the disk storage capacity is enlarged, but its additional space cannot be used directly. You must log in to the server and extend the disk partition and file system. For details, see Table 1.

Table 1 Extending the disk partition and file system

Capacity After Expansion

Extend Disk Partition and File System

Disk capacity <= 2 TiB

Disk capacity > 2 TiB


If the server is stopped during the expansion, the additional space of a Windows system disk, Windows data disk, or Linux system disk may be automatically added to the last partition after the server is started. In this case, the additional space can be directly used. If the additional space is not automatically added, extend the partition and file system according to the preceding steps.