How to manually scale out or scale in storage space for clusters billed by storage space - PolarDB

PolarDB for MySQL lets you increase or decrease the storage capacity of an Enterprise Edition cluster with the subscription billing method without interrupting service.

Prerequisites

Before you begin, make sure that:

Your cluster uses the Enterprise Edition with the subscription billing method. Manual storage scaling is only available for Enterprise Edition clusters using the subscription billing method.
(Scale-down only) Your cluster is not a multi-master cluster or a serverless cluster — these cluster types do not support storage scale-down.

Limitations

Important

You cannot downgrade the storage type of an existing cluster from PSL5 to PSL4.

You cannot increase storage capacity during a scale-down operation. Before scaling down, check your current storage usage to make sure the reduction does not affect your workload.

Potential impacts

Storage scale-up does not cause service interruption.
PSL4 or PSL5 storage scale-down does not cause service interruption.

Scale up storage capacity

Log on to the PolarDB console.
In the upper-left corner, select the region where the cluster is deployed.
Find the cluster and click its ID.
In the Distributed Storage section of the Basic Information page, choose Change Storage Capacity > Manually Scale Up.
On the Change Configurations page, select the required storage capacity, select the Terms of Service, and click Buy Now.
On the Purchase page, confirm the order and click Purchase.

Scale down storage capacity

Important

You cannot increase storage capacity during a scale-down operation. Check your current storage usage before proceeding to make sure the target capacity is sufficient for your data.

Log on to the PolarDB console.
In the upper-left corner, select the region where the cluster is deployed.
Find the cluster and click its ID.
In the Distributed Storage section of the Basic Information page, choose Change Storage Capacity > Manually Scale In.
On the Downgrade page, select the required storage capacity, select the Terms of Service, and click Buy Now.

What's next

If your storage space is fully occupied by data files, temporary files, or binary logs, see FAQ for troubleshooting guidance.