To meet the expanded business needs, you can increase the size of a cloud disk when it is used as a system disk or a data disk. To resize the disks, use different features:
- For a system disk: Change System Disk
- For a data disk: Resize Disk
Size limits of cloud disks
The size limits of cloud disks for resizing vary between system disks and data disks.
System disks
By using the Change system disk feature, you can keep the system disk size unchanged or increase the size only, but not reduce the size. For example, before changing, the system disk of a CentOS instance is of 35 GiB, so it must be equal to or greater than 35 GiB after changing. The size limit for changing is determined by the image and the current size of the system disk, as displayed in the following table.
| Image | Size limit (GiB) |
|---|---|
| Linux (excluding CoreOS) + FreeBSD | [Max{20, current size of the system disk}, 500] |
| CoreOS | [Max{30, current size of the system disk}, 500] |
| Windows | [Max{40, current size of the system disk}, 500] |
Data disk
By using the Resize Disk feature, you can keep the data disk size unchanged or increase the size only, but not reduce the size. The following table lists the capacity limit of a data disk after resizing, which is determined by the cloud disk types.
| Cloud disk type | Current capacity | Capacity after resizing |
|---|---|---|
| Basic Cloud Disk | Any | 2000 GiB |
| SSD Cloud Disk or Ultra Cloud Disk | equal or less than 2048 GiB | 2048 GiB |
| SSD Cloud Disk or Ultra Cloud Disk | > 2048 GiB | Cannot be resized |
Operations
You can perform the following tasks:
- To increase the size of the system disk of an ECS instance, see Increase system disk size.
- To resize a data disk attached to a Windows instance, see Windows _ Resize a data disk.
- To resize a data disk attached to a Linux instance, see Linux _ Resize a data disk.