NAS resource plans - offset storage fees with prepaid capacity - File Storage NAS

Resource plan types

Resource plan	Description
General-purpose NAS resource plan	Offsets storage fees for Storage Usage of General-purpose NAS (Capacity/Performance)^①, IA storage class usage, or Archive Storage usage.
Extreme NAS resource plan	Offsets provisioned capacity fees for Extreme NAS (Standard/Advanced).

① This billable item covers data stored in Capacity, Advanced, and Performance NAS file systems.

Offset factors

Important

These offset factors apply only to Chinese mainland regions. For other regions, use the calculator and select a region to view its factors.

General-purpose NAS resource plan

General-purpose NAS (Capacity/Advanced/Performance) file systems use the Standard storage class by default. With a lifecycle management policy enabled, data matching the policy rules moves to the IA storage class or Archive Storage.

File storage class	Billable item	Billable item code	Resource plan capacity consumed per GiB of storage capacity (coefficient)	Description
Standard storage	Storage Usage of General-purpose NAS (Capacity/Performance)	VolumeSize	Capacity: 1 Advanced: 2.43 Performance: 5.47	Capacity: 1 GiB of plan capacity offsets 1 GiB of Capacity storage (including recycle bin). Advanced: 2.43 GiB of plan capacity offsets 1 GiB of Advanced storage (including recycle bin). Performance: 5.47 GiB of plan capacity offsets 1 GiB of Performance storage (including recycle bin).
IA storage class	Storage Usage of IA Storage Class	VolumeIASize	0.37	0.37 GiB of plan capacity offsets 1 GiB of IA storage usage (including recycle bin).
Archive Storage	Storage Usage of Archive Storage Class	VolumeArchiveSize	0.17	0.17 GiB of plan capacity offsets 1 GiB of Archive Storage usage (including recycle bin).

Extreme NAS resource plan

Storage specification	Billable item	Billable item code	Resource plan capacity consumed per GiB of storage capacity (coefficient)	Description
Standard	Extreme provisioned capacity	size	1	1 GiB of plan capacity offsets 1 GiB of Extreme NAS provisioned capacity.
Advanced	Extreme provisioned capacity	size	1

Purchase recommendations

Important

Before purchasing a resource plan, note the following:

Different file system types and storage types have different deduction coefficients. Select an appropriate resource plan specification based on the file system type that you actually use. For more information about deduction coefficients, see Deduction coefficients.
If you have enabled the lifecycle management feature, some data is automatically moved to Infrequent Access (IA) storage or Archive storage. The deduction coefficient for Infrequent Access (IA) storage is 0.37, and the deduction coefficient for Archive storage is 0.17. This means that the resource plan deducts IA and Archive storage more efficiently. Select a resource plan specification after a comprehensive evaluation.
A resource plan is not automatically renewed after it expires (unless you have enabled auto-renewal). After the resource plan expires, billing automatically switches to pay-as-you-go. Pay attention to the expiration time of your resource plan and renew or repurchase it in a timely manner.

Recommendation 1: Choose a plan type by billable item

Check the billable item in your billing details to determine the matching plan type. Each type maps to specific billable items in Resource plan types.

For example, if your bill shows Storage Usage of General-purpose NAS (Capacity/Performance), purchase a General-purpose NAS resource plan.

Recommendation 2: Choose a plan size by usage

Check the usage in your billing details to choose a plan size.

NAS resource plans only deduct part of the storage capacity costs of file systems. Different file system types and storage types have different deduction coefficients. Before purchasing, you can Use the calculator to view the deduction coefficients for the corresponding region and plan your capacity.

For example, if your Performance NAS file system in China (Hangzhou) has 18 GiB hourly peak usage, a 100 GiB General-purpose NAS resource plan covers the storage fee.

Recommendation 3: Troubleshoot pay-as-you-go bills after purchasing a plan

Check the billable item type, usage, and billing time on the billing details page.
Check the plan type, capacity, and validity period on the Resource Plan List page.

Compare the billable item with the resource plan.

Example issue	Cause	Solution
Your bill shows 14 GiB hourly usage for Storage Usage of General-purpose NAS (Capacity/Performance). Your General-purpose NAS resource plan has 50 GiB total capacity.	The fee is for a Performance NAS file system with an offset factor of 5.47. A 50 GiB plan offsets only ~9.15 GiB (50 / 5.47) of Performance NAS usage, so the remaining usage is billed pay-as-you-go.	Upgrade the plan to 100 GiB or purchase an additional 50 GiB plan.
The bill predates the resource plan purchase.	Resource plans do not offset fees incurred before purchase.	None

Recommendation 4: Reduce costs with lifecycle management

Combine a General-purpose NAS resource plan with Lifecycle management to reduce costs:

Example: 100 GiB total — 20 GiB hot data in a Capacity file system, 60 GiB in IA storage, and 20 GiB in Archive Storage.
- The equivalent base capacity of a General-purpose NAS resource plan is 20 GiB × 1 + 60 GiB × 0.37 + 20 GiB × 0.17 = 45.6 GiB.
Example: 100 GiB total — 20 GiB hot data in an Advanced file system, 60 GiB in IA storage, and 20 GiB in Archive Storage.
- The equivalent base capacity of a General-purpose NAS resource plan is 20 GiB × 2.45 + 60 GiB × 0.37 + 20 GiB × 0.17 = 74.6 GiB.
Example: 100 GiB total — 20 GiB hot data in a Performance file system, 60 GiB in IA storage, and 20 GiB in Archive Storage.
- The equivalent base capacity of a General-purpose NAS resource plan is 20 GiB × 5.47 + 60 GiB × 0.37 + 20 GiB × 0.17 = 135 GiB.

Offset limitations

NAS resource plans can only deduct NAS service costs and cannot be used to deduct costs across products.
Each type of resource plan can only deduct the capacity costs of the corresponding file system. For more information, see Resource plan types.
A NAS region-specific resource plan only deducts the capacity costs of the corresponding file system within the specified region. For more information, see Offset regions.
After a resource plan expires or its quota is exhausted, the excess usage is automatically billed on a pay-as-you-go basis.

Offset regions

NAS offers region-specific resource plans. Check the Purchase NAS Resource Plan page for available regions.

Region-specific plans offset capacity fees only within the purchased region and cannot be shared across regions.

For example, a China (Hangzhou) plan offsets fees only for file systems in that region.

Offset order

Multiple resource plans of the same type are applied in this order:

Plans expiring earliest are applied first. Plans with the same expiration date are applied in purchase order.

Example: Plans A, B, and C in China (Hangzhou). C expires first; A and B expire together but A was purchased first. Offset order: C, A, B.
After a plan is exhausted, excess usage is billed pay-as-you-go.

Note

If your account has a resource plan, a Storage Capacity Unit (SCU), and a storage plan, capacity is offset in the order shown below. deduction order

Supported operations

Resource plan	Purchase	Upgrade	Auto-renewal	Stack	Details
General-purpose NAS resource plan	Supported	Supported	Supported	Supported	Supported
Extreme NAS resource plan	Supported	Supported	Supported	Supported	Supported

File Storage NAS:Resource plans