This topic describes billing items and billing methods for NAS. You can familiarize yourself with the pricing structure of NAS through this topic.

Billing items

NAS supports the subscription and pay-as-you-go billing methods. The two billing methods are both based on the used space of a file system.

Billing item Calculation
Used space Charges are incurred for the maximum used space of a file system within an hour. Used space indicates the total size of all files on a file system, excluding directories. The basic storage unit is 4 KB even if a file is less than 4 KB. For example, if the size of a file is 3 KB, the file will be stored in a storage unit of 4 KB.
Note NAS allocates extra space to a file system for backup. Therefore, charges for the extra space are added to the total cost of a file system.

Billing methods

NAS supports the subscription and pay-as-you-go billing methods.

  • Pay-as-you-go: Pay-as-you-go is a billing method that you can use to pay for a service after you use the service. Expenses incurred within an hour are deducted from the balance at the next hourly interval. For example, if you receive a bill at 9:30, the bill includes the expenses from 8:00 to 9:00. The basic billing unit is one hour. Each expense is paid by the hour even if the usage time of a file system is less than one hour.
    Note Assume that you receive a bill at 9:30. However, the bill may only include the expenses from 7:00 to 8:00 due to a system delay.
  • Subscription (Storage Package): After you purchase a storage package, it covers a specified amount of consumed resources that you use. A storage package is more cost-effective.
    Note
    • If the used space of a file system exceeds the maximum capacity of a storage package, charges incurred for the extra space is paid by using the pay-as-you-go billing method.
    • You can attach only one storage package to each file system.
    • During the validity period of a storage package, you cannot downgrade the storage package.

    For example, you purchase a storage package of 500 GB for File System A. During a period from 7:00 to 8:00, the maximum used space of File System A is 800 GB. Therefore, 500 GB of the total 800 GB is covered by the storage package. Charges incurred for the remaining 300 GB are paid by using the pay-as-you-go billing method.

For more information about the pricing structure of NAS, see Pricing.

FAQ

  • Are charges incurred after I activate NAS?

    No, no charge is incurred if you only activate NAS.

  • After you delete all data on a file system, the storage capacity of the file system is unchanged. However, you are still being charged for use of the storage capacity.

    The used space of a file system is displayed on a bill and in the NAS console. The value of the used space only indicates the maximum storage capacity for the file system over the last hour. You need to wait a few minutes until the value changes.