ClickHouse Disk Capacity Expansion

The vertical capacity expansion is performed by expanding disk capacity. Data is usually stored on the compute nodes, and disk expansion is required when the disk capacity of the compute nodes is insufficient.

During disk capacity expansion, cluster services may jitter.
You can perform disk capacity expansion on a cluster when the cluster is in the In service state and no task is being performed (such as scale-out, parameter modification, and specification change).

Procedure

Log in to the CloudTable console.
Click Cluster Management.
In the cluster list, locate the row that contains the target cluster and click Disk Expansion in the Operation column. If you fail to find Disk Expansion, click More and choose Disk Expansion in the Operation column.

Figure 1 Disk Expansion page

You can also click Disk Expansion on the cluster details page to go to the page for expanding disk capacity.
Figure 2 Accessing the Disk Expansion page
Select the target node type.
Press + to increase nodes.
Confirm the fee and resource quota, and click OK.

Disk Expansion Status

**Table 1** Disk expansion status description
Status	Description
Disk expanding	Indicates that a cluster is being scaled out.
In service	This status is shown in Cluster Status, indicating that the scale-out is complete and the cluster can provide services.
Scale-out failed	This status is shown in Task Status, indicating that the cluster fails to be scaled out.