Storage
Last updated: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 |
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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