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TDMQ for CKafka

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Glossary
DocumentaçãoTDMQ for CKafkaBillingPricingStorage

Storage

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Última atualização: 2026-01-20 16:39:56
TDMQ for CKafka (CKafka) supports two storage modes: fixed storage and elastic storage. The scenarios and billing methods differ between the two storage modes. When purchasing an instance, you can choose either of the two storage modes.
Storage Type
Applicable Version
Description
Billing Mode
Scenario
Fixed storage
Full series
Different instance specifications correspond to different minimum storage capacity limits.
Yearly/Monthly subscription and postpaid by hour
Suitable for scenarios that require message persistence and have stable storage consumption.
Elastic storage
Pro Edition
Storage is used on demand and charged under the pay-as-you-go mode with no theoretical upper limit on its capacity.
Pay-as-you-go
Suitable for scenarios where most messages are consumed and deleted immediately, and storage usage is either low or highly variable. For details, see Elastic Storage.

Fixed Storage

Minimum Disk Capacity Required

When you purchase a CKafka instance, a minimum disk capacity is required. The minimum disk capacity varies depending on the selected bandwidth specification. The following table describes the specific mappings.
Product Edition
Peak Bandwidth (MB/s)
Minimum Disk Capacity Required (GB)
Advanced Edition
x = 20
200
40 ≤ x＜120
500
120 ≤ x＜320
1000
320 ≤ x≤ 360
3000
Pro Edition
x = 20
200
40 ≤ x＜120
500
120 ≤ x＜320
1000
320 ≤ x＜800
3000
800 ≤ x＜1000
5400
1000 ≤ x ≤ 1200
7500
More than 1600
10000

Disk Pricing

For the fixed storage, disk capacity is scaled out in units of 100 GB. The disk prices are as follows:
Disk Type
Yearly/Monthly Subscription Unit Price (USD/GB/Month)
Postpaid by Hour Unit Price (USD/GB/Hour)
Cloud SSD
0.16
0.0003
Premium Disk
0.06
0.0001
For cloud disk types, see Cloud Disk Types.
Note:
When creating a topic in CKafka, you can select three-replica storage or two-replica storage. The actual storage space is equal to the purchased disk space divided by the number of replicas.
For example, if you purchase a 300 GB disk, the actual storage space is 150 GB for two-replica storage, and 100 GB for three-replica storage.

Elastic Storage

Pricing

Elastic storage is billed based on the space size and duration of message storage.
Billing modes: postpaid by hour, with the measurement unit being USD/GB/hour.
Billing granularity: Tiered billing is based on the maximum disk capacity used within an hour. Usage of less than 1 hour is billed as 1 hour. The storage space must be multiplied by the number of replicas.
Storage Space Tier (GB)
Price (USD/GB/Hour)
[1,1024]
0.00018
(1024,5×1024]
0.00012
(5×1024,10×1024]
0.0001
Greater than 10 x 1024
0.00007

Billing Examples

Time
Hour 1
Hour 2
Hour 3
Hour 4
Hour 5
Maximum storage space (GB)
1000
1000
2000
2000
6000
In both hour 1 and hour 2, the maximum storage space falls within the [1,1024] billing range.
Hourly cost in hour 1 and hour 2: 0.00018 (USD/hour) x 1000 (GB) = USD 0.18
In hour 3 and hour 4, the maximum storage space is 2000 GB, partially falling within the (10245 x 1024] range.
Hourly cost in hour 3 and hour 4: 0.00018 (USD/hour) x 1024 (GB) + 0.00012 (USD/hour) x (2000 - 1024) (GB) = USD 0.30144
In hour 5, the maximum storage space is 6000 GB, spanning 3 billing ranges.
Cost in hour 5: 0.00018 (USD/hour) x 1024 (GB) + 0.00012 (USD/hour) x 4 x 1024 (GB) + 0.0001 (USD/hour) x (6000 - 1024 x 5) (GB) = USD 0.76384
Result: The total elastic storage cost in the 5 hours is: 0.18 + 0.18 + 0.3014 + 0.30144 + 0.76384 = 1.72664 ≈ USD 1.73.

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