This topic provides answers to commonly asked questions about the pricing of Apsara File Storage NAS.

Are fees incurred after I activate NAS?

No fees are incurred if you only activate NAS. Fees start to be incurred when you write data to NAS file systems.

How can I stop being charged for NAS?

You can delete all of your mount targets and file systems to stop being charged if you no longer use NAS. You will no longer be charged from the next billing cycle. However, NAS cannot be deactivated for business concerns.

If you no longer use NAS, delete all mount targets of each file system. Then, you can delete all file systems. After all available resources are deleted, no fees are incurred by NAS from the next billing cycle.

Why is the used storage space and the fees of a file system unchanged after I delete data in the file system?

The data that is displayed in the NAS console is unchanged because a latency period exists between two consecutive data updates. A bill is generated each hour. The bill of the last hour is displayed in the NAS console.

How am I charged when data is uploaded to or downloaded from a file system?

  • Data migration between an on-premises storage solution and NAS

    You may be charged for data downloads. To enable access from the Internet to a NAS file system, you must configure an Elastic Compute Service (ECS) instance as the intermediate node and the ECS instance must allow access from the Internet. If the ECS instance to which an elastic IP address (EIP) is attached, you are charged for the outbound traffic of the EIP but not for the inbound traffic. You are charged for data downloads to a NAS file system. However, you are not charged for data uploads. For more information about EIP billing, see Pay-as-you-go.

  • Data migration between Object Storage Service (OSS) and NAS
    • You are charged for traffic that is incurred when you access data in the Infrequent Access (IA) storage medium of a NAS file system. For more information, see Billing of IA storage media.
    • You are charged for API requests when you call API operations to access data in OSS buckets. For more information, seeAPI operation calling fees.
    • You are charged for the Data Transport service. For more information, see Pricing.
  • Data migration between NAS file systems
    • You are charged for traffic that is incurred when you access data in the IA storage medium of the NAS file system. For more information, see Billing of IA storage media.
    • You are charged for the Data Transport service. For more information, see Pricing.

How am I billed for the storage space of a NAS file system?

  • General-purpose NAS file system

    You are billed based on the hourly maximum used storage space of a General-purpose NAS file system. Used storage space indicates the total size of all files in the General-purpose NAS file system. The size of directories is not counted. The basic storage unit is 4 KiB. If the size of a file is not a multiple of 4 KiB, the billed storage space is rounded up to the nearest multiple of 4 KiB. For example, if the size of a file is 3 KiB, you are billed for a storage space of 4 KiB.

  • Extreme NAS file system

    You are billed based on the capacity that is configured when you create an Extreme NAS file system.

Why do I have overdue payments after I purchase a storage package?

After you purchase and attach a storage package to a file system, overdue payments occur due to the following reasons:
  • The used storage space of the file system exceeds the capacity of the storage package.

    For example, you purchase a storage package (100 GiB, 1 month) and attach the storage package to a Performance NAS file system A. During a billing cycle, the used storage space of the file system A is 180 GiB. The fees of 100 GiB are deducted by the storage package, and the pay-as-you-go billing method is applied to the overage of 80 GiB. To avoid pay-as-you-go costs, you can upgrade the storage package. For more information, see Upgrade a storage package.

  • The storage package expires.

    For example, you purchase a storage package (500 GiB, 1 month) at 10:39:41 on August 5, 2020, and attach the storage package to a file system. The storage package expires at 00:00:00 on September 6, 2020. After the storage package expires, the pay-as-you-go billing method applies and overdue payments occur. To avoid this issue, you can renew the storage package before the storage package expires. For more information, see Renew a storage package.

  • The lifecycle management feature is enabled and files that are stored in the IA storage medium are accessed.

    If a file meets the rule that is configured in the lifecycle management policy, the file is transitioned to the IA storage medium. You are billed for traffic by using the pay-as-you-go billing method when you access data in the IA storage medium. The overdue payments then occur. For more information, see Billing of IA storage media.

  • The billing system has latency.

    The storage package immediately takes effect after you complete the payment. However, you may not receive a bill of the last hour in time. For example, if you receive a bill at 10:00, the bill may contain the fees that are incurred from 7:00 to 9:00. We recommend that you check the time when the fees are incurred after you receive the bill.

What is the relationship between a storage package and the capacity of a file system?

  • Storage package

    Storage packages are used to deduct the fees of General-purpose NAS file systems.

    Note If you need a storage package of a higher specification, you can upgrade the storage package. For more information, see Upgrade a storage package.
  • Capacity of a file system
    Capacity indicates how much space the file system provides for you to store data.
    • The maximum capacity of a Performance NAS file system is 1 PiB.
    • The maximum capacity of a Capacity NAS file system is 10 PiB.
    • The capacity of an Extreme NAS file system is fixed. You can select a capacity for an Extreme NAS file system when you purchase the file system. The maximum capacity of an Extreme NAS file system is 256 TiB.
    To view the capacity of a file system, perform the following steps:
    1. Log on to the NAS console.
    2. In the left-side navigation pane, choose File System > File System List.
    3. Find the required file system, and click the file system ID in the File System ID/Name column or click Management in the Operations column. In the Basic Information section of the details page, view the used storage space and the maximum capacity of the file system.

      On the details page of a General-purpose NAS file system, the Usage parameter indicates the maximum used storage space in the last hour.

      In Linux, you can run the df -h command to view the used storage space of a file system. If the used storage space is zero, it indicates that no data is stored in the file system.

Is the capacity of a file system limited to the capacity of a storage package?

No, a storage package that is attached to a file system does not limit the capacity of the file system. However, the used storage space of the file system cannot exceed the maximum capacity of the file system. The maximum capacity of a Capacity NAS file system is 1 PiB. The maximum capacity of a Performance NAS file system is 10 PiB. If the used storage space of the file system exceeds the capacity of the storage package, the pay-as-you-go billing method is applied to the overage.

For example, you purchase a storage package (100 GiB, 1 month) and attach the storage package to a Performance NAS file system. During a billing cycle, the used storage space of the file system is 180 GiB. The fees of 100 GiB are deducted by the storage package and you are billed for the overage of 80 GiB by using the pay-as-you-go billing method.

When does a storage package take effect?

A storage package immediately takes effect after you complete the payment for the storage package.

What happens after a storage package expires?

If you do not renew a storage package before the storage package expires, the pay-as-you-go billing method is applied. To avoid the impact on the NAS file system due to overdue payments, you can enable the auto-renewal feature. For more information, see Renew a storage package.

What happens if the used storage space of a file system exceeds the capacity of a storage package?

If the used storage space of the file system exceeds the capacity of the storage package, the pay-as-you-go billing method is applied to the overage.

For example, you create a Performance NAS file system and attach a storage package (500 GiB, 1 month) to the file system. The maximum used storage space of the file system is 550 GiB from 7:00 to 8:00 on August 1, 2020. The fees of 500 GiB are deducted by the storage package and the pay-as-you-go billing method is applied to the overage of 50 GiB.

Can I purchase a storage package and not attach the storage package to a file system?

No, you cannot. If you need a storage package of a higher specification or longer duration, you can upgrade or renew the storage package. For more information, see Upgrade a storage package and Renew a storage package.

How can I detach a storage package from a file system?

You cannot manually detach the storage package from the file system. However, the storage package is automatically detached if the file system is deleted.

How can I change the file system to which a storage package is attached?

You must delete the file system to detach the storage package and then attach the storage package to another file system.

Can I apply for a refund after I purchase a storage package?

Yes, you can apply for a refund if no data is stored in the file system to which the purchased storage package is attached.In this case, .

Can I attach a storage package to an Extreme NAS file system?

No, you can attach the storage package only to a General-purpose NAS file system. The storage package can be used to deduct only the fees of the General-purpose NAS file system. For more information about the billing of Extreme NAS file systems, see Billing of Extreme NAS file systems.

How can I view the expiration time of a storage package?

You can view the basic information of the storage package, including the ID, capacity, start time, and expiration time, in the Storage Package section of the details page of the required file system.

Can I attach multiple storage packages to a file system?

No, only one storage package can be attached to each file system. You must attach a storage package to a file system when you create the storage package. A storage package can be attached to only one file system. If you need a storage package of a higher specification or longer duration, you can upgrade or renew the storage package. For more information, see Upgrade a storage package and Renew a storage package.

How can I check whether my payments are overdue?

You can check whether your payments are overdue in the Billing Management console. Overdue payments will affect the use of NAS file systems.

  1. Log on to the Alibaba Cloud Management Console.
  2. In the top navigation bar, click Expenses to go to the Billing Management console.
  3. In the left-side navigation pane, click Bill. On the page that appears, the overdue payments are displayed.
    If you have overdue payments, add funds to your account balance at your earliest opportunity.