Subscription storage billing requires prepaying for a fixed storage capacity at cluster purchase time. Use this method when your storage needs are stable and predictable.
When to use this billing method
Choose subscription storage when both of the following conditions apply:
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The total storage across all clusters in a region under your Alibaba Cloud account is less than 10 TB
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Your workload is stable and storage growth is predictable
Pricing
Charges are based on the capacity you purchase upfront.
Monthly subscription price per GB
| Storage class | The Chinese mainland | China (Hong Kong) and other regions | |
|---|---|---|---|
| PSL5 | Dual-zone deployment (hot standby storage cluster enabled) | USD 0.349/GB/month | USD 0.389/GB/month |
| Dual-zone deployment (hot standby storage cluster and compute standby enabled) | |||
| Single zone (hot standby storage cluster disabled) | USD 0.175/GB/month | USD 0.195/GB/month | |
| PSL4 | Dual-zone deployment (hot standby storage cluster enabled) | USD 0.231/GB/month | USD 0.257/GB/month |
| Dual-zone deployment (hot standby storage cluster and compute standby enabled) | |||
| Single zone (hot standby storage cluster disabled) | USD 0.115/GB/month | USD 0.129/GB/month | |
If your data volume exceeds the purchased capacity, the cluster continues to run normally. The excess data is billed at pay-as-you-go rates on top of your subscription fee.
Limitations
Storage supports only scale-out. You cannot reduce purchased storage capacity after purchase.
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Subscription storage is dedicated to the specific cluster it was purchased for and cannot be shared across clusters. Unused capacity may be wasted.
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To increase storage capacity, see Manual scale-out.
Price estimation
PolarDB provides the price calculator and resource plan calculator. You can use the calculators to obtain information about the product pricing, estimate costs, and select a product type that meets your business requirements.
Price calculator: allows you to estimate the overall cost based on the details and storage capacity of the cluster that you select.
Resource plan calculator: allows you to estimate required compute capacity and storage capacity based on your business requirements and usage duration. The calculator can also provide recommendations on the specifications of storage plans and compute plans for clusters with defined specifications.
Purchase subscription storage
To purchase subscription storage, see Purchase a subscription cluster.