> For the complete documentation index, see [llms.txt](https://lia-console.gitbook.io/liasail-docs-en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lia-console.gitbook.io/liasail-docs-en/price/volume-billing.md).

# Volume Billing

### **Prerequisites**

* Please refer to the **General Pricing Rules** and **General Lifecycle Rules** to understand subscription-based and pay-as-you-go billing models.
* Ensure you have provisioned an instance in advance to avoid idle resources and unnecessary costs.
* You can manually destroy volume-level resources, which will result in permanent release of the resource and deletion of data. This operation is irreversible.

#### **System Disk Billing Description**

In LIA-Console, the billing method for the operating system disk is aligned with the associated instance and is determined upon creation. It cannot be changed afterward:

* If the instance uses a subscription model, the operating system disk will be billed in the same subscription cycle.
* The cost of the operating system disk is included in the overall bill of the instance—no separate management or renewal is required.
* Once created, the billing model for both the instance and its operating system disk cannot be modified.

> *Note: The operating system disk cannot be renewed separately. Its lifecycle is fully synchronized with the corresponding instance.*

#### **Data Disk Billing Description**

In LIA-Console, data disks adopt a pay-as-you-go billing model, suitable for flexible resource management:

* Billing begins immediately after the data disk is successfully created, regardless of whether it is attached to an instance.
* Charges are calculated on a monthly basis.
* Even if a disk is not connected to any instance, fees will continue to accrue as long as the disk remains active.
* Data disks can be attached or detached at any time and can also be destroyed independently.

> *Note: To avoid unexpected charges, be sure to promptly delete unused data disks.*