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

Are fees incurred after I activate the NAS service?

No fees are incurred if you only activate the NAS service. 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 need the NAS service. You will no longer be charged from the next billing cycle. However, the NAS service cannot be deactivated for business concerns.

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

The data displayed in the NAS console is unchanged because a latency exists between two consecutive data updates. A bill is generated each hour. The bill displayed in the NAS console is the bill for the previous hour.

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 is attached with an Elastic IP Address (EIP), you are charged for the outbound traffic of the EIP but not for the inbound traffic. This means that you are charged for data downloads to a NAS file system but not 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 Object Storage Service (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 are you 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 KB. If the size of a file is not a multiple of 4 KB, the billed storage space is rounded up to the nearest multiple of 4 KB. For example, if the size of a file is 3 KB, you are billed for a storage space of 4 KB.

  • 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 plan?

After you purchase and attach a storage plan 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 plan.

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

  • The storage plan expires.

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

  • 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 a latency.

    The storage plan takes effect immediately after you complete the payment, but you may not receive a bill of the previous hour in time. For example, if you receive a bill at 10:00, the bill may cover the charges for the consumption from 7:00 to 9:00. We recommend that you check the time when the fees are incurred after receiving the bill.

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

  • Storage plan

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

    Note If you need a storage plan of a higher specification, you can upgrade the storage plan. For more information, see Manage storage packages.
  • Capacity of a file system
    Capacity indicates how much space the file system provides for you to store data.
    • The maximum capacity of a NAS Performance file system is 1 PB.
    • The maximum capacity of a NAS Capacity file system is 10 PB.
    • 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 TB.
    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 file system and click the ID of a file system in the File System ID/Name column or Management in the Operations column. In the Basic Information section of the details page that appears, you can 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 over the previous 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 plan?

No, a storage plan 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 NAS Capacity file system is 1 PB. The maximum capacity of a NAS Performance file system is 10 PB. If the used storage space of the file system exceeds the capacity of the storage plan, the pay-as-you-go billing method is applied to the overage.

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

When does a storage plan take effect?

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

What happens after a storage plan expires?

If you do not renew a storage plan before the storage plan 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 Manage storage packages.

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

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

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

Can I purchase a storage plan without attaching the storage plan to a file system?

No, a storage plan must be attached to a file system when the storage plan is created. A storage plan can attach to only one file system. If you need a storage plan of a higher specification or longer duration, you can upgrade or renew the storage plan. For more information, see Manage storage packages and Manage storage packages.

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

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

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

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

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

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

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

No, you can attach the storage plan only to a General-purpose NAS file system. The storage plan 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 plan?

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

Can I attach multiple storage plans to a file system?

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

How can I check whether my payments are overdue?

You can check whether your payments are overdue in the User Center. 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 User Center.
  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 at the earliest opportunity.