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DocumentationTencentDB for MongoDBProduct IntroductionProduct SpecificationsReplica Set Specifications

Replica Set Specifications

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Last updated: 2025-11-25 16:04:57

Number of Replicas

Primary/Secondary node: adopts the default architecture configuration of 3 storage nodes consisting of 1 primary node and 2 secondary nodes. Options of 5 nodes (1 primary node and 4 secondary nodes) and 7 nodes (1 primary node and 6 secondary nodes) are also available, but the number of replicas cannot be customized currently.
Read-only node: It is supported to configure secondary nodes as read-only nodes. Value range: [0, 5].

mongod Specifications

General Edition

Note:
The maximum number of connections for a 3-node replica set instance refers to the standard maximum number of connections corresponding to each specification. For single-node instances, the maximum number of connections per node can be increased up to the maximum allowable threshold.
CPU Core per Node
Memory per Node (GB)
Disk Capacity per Node (GB)
Maximum Number of Connections for the 3-Node Instance
Maximum Number of Connections per Node
(The actual maximum number cannot exceed the maximum number of connections of the instance.)
2 cores
4GB
Default value: 250 GB; value range: [100, 500]
3000
10,000

4 cores
8GB
Default value: 500 GB; value range: [150, 1000]
6000
6 cores
16GB
Default value: 750 GB; value range: [250, 1500]
9000
12 cores
32GB
Default value: 1500 GB; value range: [500, 4000]
12000
15,000
24 cores
64GB
Default value: 2500 GB; value range: [800, 5000]
18000
24 cores
128GB
Default value: 3000GB; value range: [1500, 5000]
21000
32 cores
240GB
Default value: 4000 GB; value range: [1500, 6000]
42000
20,000
48 cores
512GB
Default value: 4000 GB; value range: [1500, 6000]
60000

Cloud Disk Edition

CPU Core per Node
Memory per Node (GB)
Disk Capacity per Node (GB)
Maximum Number of Connections for the 3-Node Instance
Maximum Number of Connections per Node
(The actual maximum number cannot exceed the maximum number of connections of the instance.)
2 cores
4GB
Default value: 250 GB; value range: [10, 6000]
3000
10,000
4 cores
8GB
Default value: 500 GB; value range: [10, 6000]
6000
6 cores
16GB
Default value: 750 GB; value range: [10, 6000]
9000
12 cores
32GB
Default value: 1500 GB; value range: [10, 6000]
12000
15,000
24 cores
64GB
Default value: 2500 GB; value range: [10, 6000]
18000
24 cores
128GB
Default value: 3000 GB; value range: [10, 6000]
21000
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