Help Center/ Elastic Volume Service/ FAQs/ Capacity/ How Can I View the Available Capacity of My Disk?

Updated on 2025-08-04 GMT+08:00

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How Can I View the Available Capacity of My Disk?

You can view the available capacity of a disk on the ECS. The operations are as follows:

Log in to the server.

For how to log in to an ECS, see Logging In to an ECS.

For how to log in to a BMS, see Logging In to a BMS.

Query the disk capacity. Two methods are provided as follows:
- View the disk usage manually.
  The details depend on the OS. This FAQ uses Windows Server 2008, Windows Server 2016, and Linux as examples to describe how to view the disk usage.
- Install the Agent to view the disk usage.
  For details about how to install the Agent on an ECS, see Installing the Agent on a Linux Server in the Cloud Eye User Guide.

Viewing the Disk Usage in Linux

In this section, CentOS 7.4 64bit is used as an example. The details depend on if you need to view the available space or not.

To query the total capacity only, run lsblk.
Information similar to the following is displayed:
```
[root@ecs-test-0001 ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
vda    253:0    0   40G  0 disk
└─vda1 253:1    0   40G  0 part /
vdb    253:16   0   40G  0 disk
└─vdb1 253:17   0   40G  0 part
```
In the command output, the server has two disks, /dev/vda and /dev/vdb. System disk /dev/vda has 40 GiB of capacity, as does data disk /dev/vdb.
To query the total capacity and display the space available as well, run df -TH. Ensure that the disk has been attached and initialized before running this command.
Information similar to the following is displayed:
```
[root@ecs-0001 ~]# df -TH
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/vda1      ext4       43G  2.0G   39G   5% /
devtmpfs       devtmpfs  509M     0  509M   0% /dev
tmpfs          tmpfs     520M     0  520M   0% /dev/shm
tmpfs          tmpfs     520M  7.2M  513M   2% /run
tmpfs          tmpfs     520M     0  520M   0% /sys/fs/cgroup
tmpfs          tmpfs     104M     0  104M   0% /run/user/0
/dev/vdb1      ext4       43G   51M   40G   1% /mnt/sdc
```
In the command output, the server has two partitions, /dev/vda1 and /dev/vdb1. Partition /dev/vda1 is used to deploy the OS, and its total capacity, used capacity, and available capacity are 43 GiB, 2 GiB, and 39 GiB, respectively. Partition /dev/vdb1's total capacity, used capacity, and available capacity are 43 GiB, 51 MiB, and 40 GiB, respectively.

Viewing the Disk Usage in Windows Server 2008

In this section, Windows Server 2008 R2 Enterprise 64bit is used as an example.

On the desktop of the server, right-click Computer and choose Manage from the shortcut menu.

The Server Manager window is displayed.
In the navigation tree, choose Storage > Disk Management.

The sizes and available spaces of the volumes on the current disk are displayed in the middle pane.

Figure 1 Disk Management page

Viewing the Disk Usage in Windows Server 2016

In this section, Windows Server 2016 Standard 64bit is used as an example.

On the desktop of the server, click the start icon in the lower left corner.

The Windows Server window is displayed.
Click Server Manager.

The Server Manager window is displayed.

Figure 2 Server Manager page
In the upper right corner, choose Tools > Computer Management.
Choose Storage > Disk Management.

In the middle pane, you can view the sizes and available spaces of the volumes on the disk.

Figure 3 Disk list page

Installing the Agent to View the Disk Usage

Some disk monitoring metrics require that the agent to be installed.

For details about how to install the Agent on an ECS, see Installing the Agent on a Linux Server in the Cloud Eye User Guide.

**Table 1** Disk metrics
Metric	Parameter	Description	Value Range	Unit	Conversion Rule	Monitored Object & Dimension	Monitoring Period (Raw Data)
disk_free	(Agent) Available Disk Space	Free space on the disks Linux: Run the df -h command to check the value in the Avail column. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~). Windows: Use the WMI interface to call GetDiskFreeSpaceExW API to obtain disk space data. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~).	≥0	GB	N/A	ECS - Mount point	1 minute
disk_total	(Agent) Disk Storage Capacity	Total space on the disks, including used and free Linux: Run the df -h command to check the value in the Size column. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~). Windows: Use the WMI interface to call GetDiskFreeSpaceExW API to obtain disk space data. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~).	≥0	GB	N/A	ECS - Mount point	1 minute
disk_used	(Agent) Used Disk Space	Used space on the disks Linux: Run the df -h command to check the value in the Used column. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~). Windows: Use the WMI interface to call GetDiskFreeSpaceExW API to obtain disk space data. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~).	≥0	GB	N/A	ECS - Mount point	1 minute
disk_usedPercent	(Agent) Disk Usage	Percentage of total disk space that is used, which is calculated as follows: Disk Usage = Used Disk Space/Disk Storage Capacity Linux: It is calculated as follows: Used/Size. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~). Windows: Use the WMI interface to call GetDiskFreeSpaceExW API to obtain disk space data. The path of the mount point prefix cannot exceed 64 characters. It must start with a letter, and contain only digits, letters, hyphens (-), periods (.), and swung dashes (~).	0-100	%	N/A	ECS - Mount point	1 minute

Parent topic: Capacity

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