DB Instance Description

DB Instance Classes

DB instance specifications are listed in the following table. Select appropriate specifications according to your service requirements.

Cluster

For details about specifications of the Community Edition cluster instance, see Table 15-80 and Table 15-81

Table 15-80 config specifications

CPU Type	Specification Type	vCPUs	Memory (GB)	Flavor ID	Default Maximum Number of Connections
x86	General-purpose	2	4	dds.mongodb.s6.large.2.config	1000
	Enhanced	2	4	dds.mongodb.c3.large.2.config
	Enhanced II	2	4	dds.mongodb.c6.large.2.config
Kunpeng	-	2	4	dds.mongodb.large.arm2.config

Table 15-81 mongos and shard specifications

CPU Type	Specifications	Component	vCPUs	Memory (GB)	Flavor ID	Default Maximum Number of Connections
x86	General-purpose	mongos	2	4	dds.mongodb.s6.large.2.mongos	400
			2	8	dds.mongodb.s6.large.4.mongos	400
			4	8	dds.mongodb.s6.xlarge.2.mongos	1000
			4	16	dds.mongodb.s6.xlarge.4.mongos	1000
			8	16	dds.mongodb.s6.2xlarge.2.mongos	4000
			8	32	dds.mongodb.s6.2xlarge.4.mongos	4000
			16	32	dds.mongodb.s6.4xlarge.2.mongos	8000
			16	64	dds.mongodb.s6.4xlarge.4.mongos	8000
		shard	2	4	dds.mongodb.s6.large.2.shard	400
			2	8	dds.mongodb.s6.large.4.shard	400
			4	8	dds.mongodb.s6.xlarge.2.shard	1000
			4	16	dds.mongodb.s6.xlarge.4.shard	1000
			8	16	dds.mongodb.s6.2xlarge.2.shard	4000
			8	32	dds.mongodb.s6.2xlarge.4.shard	4000
			16	32	dds.mongodb.s6.4xlarge.2.shard	8000
			16	64	dds.mongodb.s6.4xlarge.4.shard	8000
	Enhanced	mongos	2	4	dds.mongodb.c3.large.2.mongos	400
			2	8	dds.mongodb.c3.large.4.mongos	400
			4	8	dds.mongodb.c3.xlarge.2.mongos	1000
			4	16	dds.mongodb.c3.xlarge.4.mongos	1000
			8	16	dds.mongodb.c3.2xlarge.2.mongos	4000
			8	32	dds.mongodb.c3.2xlarge.4.mongos	4000
			16	32	dds.mongodb.c3.4xlarge.2.mongos	8000
			16	64	dds.mongodb.c3.4xlarge.4.mongos	8000
			32	64	dds.mongodb.c3.8xlarge.2.mongos	8000
			32	128	dds.mongodb.c3.8xlarge.4.mongos	8000
			60	128	dds.mongodb.c3.15xlarge.2.mongos	8000
			60	256	dds.mongodb.c3.15xlarge.4.mongos	8000
		shard	2	4	dds.mongodb.c3.large.2.shard	400
			2	8	dds.mongodb.c3.large.4.shard	400
			4	8	dds.mongodb.c3.xlarge.2.shard	1000
			4	16	dds.mongodb.c3.xlarge.4.shard	1000
			8	16	dds.mongodb.c3.2xlarge.2.shard	4000
			8	32	dds.mongodb.c3.2xlarge.4.shard	4000
			16	32	dds.mongodb.c3.4xlarge.2.shard	8000
			16	64	dds.mongodb.c3.4xlarge.4.shard	8000
			32	64	dds.mongodb.c3.8xlarge.2.shard	8000
			32	128	dds.mongodb.c3.8xlarge.4.shard	8000
			60	128	dds.mongodb.c3.15xlarge.2.shard	8000
			60	256	dds.mongodb.c3.15xlarge.4.shard	8000
	Enhanced II	mongos	2	4	dds.mongodb.c6.large.2.mongos	400
			2	8	dds.mongodb.c6.large.4.mongos	400
			4	8	dds.mongodb.c6.xlarge.2.mongos	1000
			4	16	dds.mongodb.c6.xlarge.4.mongos	1000
			8	16	dds.mongodb.c6.2xlarge.2.mongos	4000
			8	32	dds.mongodb.c6.2xlarge.4.mongos	4000
			16	32	dds.mongodb.c6.4xlarge.2.mongos	8000
			16	64	dds.mongodb.c6.4xlarge.4.mongos	8000
			32	64	dds.mongodb.c6.8xlarge.2.mongos	8000
			32	128	dds.mongodb.c6.8xlarge.4.mongos	8000
			64	128	dds.mongodb.c6.16xlarge.2.mongos	8000
			64	256	dds.mongodb.c6.16xlarge.4.mongos	8000
		shard	2	4	dds.mongodb.c6.large.2.shard	400
			2	8	dds.mongodb.c6.large.4.shard	400
			4	8	dds.mongodb.c6.xlarge.2.shard	1000
			4	16	dds.mongodb.c6.xlarge.4.shard	1000
			8	16	dds.mongodb.c6.2xlarge.2.shard	4000
			8	32	dds.mongodb.c6.2xlarge.4.shard	4000
			16	32	dds.mongodb.c6.4xlarge.2.shard	8000
			16	64	dds.mongodb.c6.4xlarge.4.shard	8000
			32	64	dds.mongodb.c6.8xlarge.2.shard	8000
			32	128	dds.mongodb.c6.8xlarge.4.shard	8000
			64	128	dds.mongodb.c6.16xlarge.2.shard	8000
			64	256	dds.mongodb.c6.16xlarge.4.shard	8000
Kunpeng	-	mongos	2	4	dds.mongodb.large.arm2.mongos	400
	-		2	8	dds.mongodb.large.arm4.mongos	400
	-		4	8	dds.mongodb.xlarge.arm2.mongos	1000
	-		4	16	dds.mongodb.xlarge.arm4.mongos	1000
	-		8	16	dds.mongodb.2xlarge.arm2.mongos	4000
	-		8	32	dds.mongodb.2xlarge.arm4.mongos	4000
	-		16	32	dds.mongodb.4xlarge.arm2.mongos	8000
	-		16	64	dds.mongodb.4xlarge.arm4.mongos	8000
	-	shard	2	4	dds.mongodb.large.arm2.shard	400
	-		2	8	dds.mongodb.large.arm4.shard	400
	-		4	8	dds.mongodb.xlarge.arm2.shard	1000
	-		4	16	dds.mongodb.xlarge.arm4.shard	1000
	-		8	16	dds.mongodb.2xlarge.arm2.shard	4000
	-		8	32	dds.mongodb.2xlarge.arm4.shard	4000
	-		16	32	dds.mongodb.4xlarge.arm2.shard	8000
	-		16	64	dds.mongodb.4xlarge.arm4.shard	8000

Replica Set

For details about the replica set instance specifications, see Table 15-82.

Table 15-82 Replica set instance specifications

CPU Type	Specifications	vCPUs	Memory (GB)	Flavor ID	Default Maximum Number of Connections
x86	General-purpose	1	4	dds.mongodb.s6.medium.4.repset	400
		2	4	dds.mongodb.s6.large.2.repset	400
		2	8	dds.mongodb.s6.large.4.repset	400
		4	8	dds.mongodb.s6.xlarge.2.repset	1000
		4	16	dds.mongodb.s6.xlarge.4.repset	1000
		8	16	dds.mongodb.s6.2xlarge.2.repset	4000
		8	32	dds.mongodb.s6.2xlarge.4.repset	4000
		16	32	dds.mongodb.s6.4xlarge.2.repset	8000
		16	64	dds.mongodb.s6.4xlarge.4.repset	8000
	Enhanced	2	4	dds.mongodb.c3.large.2.repset	400
		2	8	dds.mongodb.c3.large.4.repset	400
		4	8	dds.mongodb.c3.xlarge.2.repset	1000
		4	16	dds.mongodb.c3.xlarge.4.repset	1000
		8	16	dds.mongodb.c3.2xlarge.2.repset	4000
		8	32	dds.mongodb.c3.2xlarge.4.repset	4000
		16	32	dds.mongodb.c3.4xlarge.2.repset	8000
		16	64	dds.mongodb.c3.4xlarge.4.repset	8000
		32	64	dds.mongodb.c3.8xlarge.2.repset	16000
		32	128	dds.mongodb.c3.8xlarge.4.repset	16000
		60	128	dds.mongodb.c3.15xlarge.2.repset	16000
		60	256	dds.mongodb.c3.15xlarge.4.repset	16000
	Enhanced II	2	4	dds.mongodb.c6.large.2.repset	400
		2	8	dds.mongodb.c6.large.4.repset	400
		4	8	dds.mongodb.c6.xlarge.2.repset	1000
		4	16	dds.mongodb.c6.xlarge.4.repset	1000
		8	16	dds.mongodb.c6.2xlarge.2.repset	4000
		8	32	dds.mongodb.c6.2xlarge.4.repset	4000
		16	32	dds.mongodb.c6.4xlarge.2.repset	8000
		16	64	dds.mongodb.c6.4xlarge.4.repset	8000
		32	64	dds.mongodb.c6.8xlarge.2.repset	16000
		32	128	dds.mongodb.c6.8xlarge.4.repset	16000
		64	128	dds.mongodb.c6.16xlarge.2.repset	16000
		64	256	dds.mongodb.c6.16xlarge.4.repset	16000
Kunpeng	-	2	4	dds.mongodb.large.arm2.repset	400
	-	2	8	dds.mongodb.large.arm4.repset	400
	-	4	8	dds.mongodb.xlarge.arm2.repset	1000
	-	4	16	dds.mongodb.xlarge.arm4.repset	1000
	-	8	16	dds.mongodb.2xlarge.arm2.repset	4000
	-	8	32	dds.mongodb.2xlarge.arm4.repset	4000
	-	16	32	dds.mongodb.4xlarge.arm2.repset	8000
	-	16	64	dds.mongodb.4xlarge.arm4.repset	8000

Single Node

Table 15-83 lists the specifications of single node instances.

Table 15-83 Single node specifications

CPU Type	Specifications	vCPUs	Memory (GB)	Flavor ID	Default Maximum Number of Connections
x86	General-purpose	2	4	dds.mongodb.s6.large.2.single	400
		2	8	dds.mongodb.s6.large.4.single	400
		4	8	dds.mongodb.s6.xlarge.2.single	1000
		4	16	dds.mongodb.s6.xlarge.4.single	1000
		8	16	dds.mongodb.s6.2xlarge.2.single	4000
		8	32	dds.mongodb.s6.2xlarge.4.single	4000
		16	32	dds.mongodb.s6.4xlarge.2.single	8000
		16	64	dds.mongodb.s6.4xlarge.4.single	8000
	Enhanced	2	4	dds.mongodb.c3.large.2.single	400
		2	8	dds.mongodb.c3.large.4.single	400
		4	8	dds.mongodb.c3.xlarge.2.single	1000
		4	16	dds.mongodb.c3.xlarge.4.single	1000
		8	16	dds.mongodb.c3.2xlarge.2.single	4000
		8	32	dds.mongodb.c3.2xlarge.4.single	4000
		16	32	dds.mongodb.c3.4xlarge.2.single	8000
		16	64	dds.mongodb.c3.4xlarge.4.single	8000
	Enhanced II	2	4	dds.mongodb.c6.large.2.single	400
		2	8	dds.mongodb.c6.large.4.single	400
		4	8	dds.mongodb.c6.xlarge.2.single	1000
		4	16	dds.mongodb.c6.xlarge.4.single	1000
		8	16	dds.mongodb.c6.2xlarge.2.single	4000
		8	32	dds.mongodb.c6.2xlarge.4.single	4000
		16	32	dds.mongodb.c6.4xlarge.2.single	8000
		16	64	dds.mongodb.c6.4xlarge.4.single	8000
Kunpeng	-	2	4	dds.mongodb.large.arm2.single	400
	-	2	8	dds.mongodb.large.arm4.single	400
	-	4	8	dds.mongodb.xlarge.arm2.single	1000
	-	4	16	dds.mongodb.xlarge.arm4.single	1000
	-	8	16	dds.mongodb.2xlarge.arm2.single	4000
	-	8	32	dds.mongodb.2xlarge.arm4.single	4000
	-	16	32	dds.mongodb.4xlarge.arm2.single	8000
	-	16	64	dds.mongodb.4xlarge.arm4.single	8000

DB Engines and Versions

Table 15-84 lists the database version supported by DDS. You need a driver compatible with MongoDB 3.0 or later to access DDS.

Table 15-84 Supported DB engines and versions

Compatibility	CPU Type	Instance Type	Storage Engine
5.0	x86	Cluster Replica set	RocksDB
4.4	x86	Cluster Replica set Single node	RocksDB
4.2	x86	Cluster Replica set Single node	RocksDB
4.0	x86 Kunpeng	Cluster Replica set Single node	WiredTiger

DB Instance Statuses

Table 15-85 Status and description

Status	Description
Available	A DB instance is running properly.
Abnormal	A DB instance is faulty.
Unhealthy	A node in an available cluster or replica set instance is abnormal or unknown.
Creating	A DB instance is being created.
Creation failed	A DB instance fails to be created.
Backing up	An instance backup is being created.
Restarting	A DB instance is being restarted because of a modification that requires restarting it for the modification to take effect.
Switchover in progress	The primary and standby nodes of the replica set instance or the primary and standby shards or configs of a cluster instance are being switched over.
Adding node	shard or mongos nodes are being added to a DDS cluster instance.
Deleting node	The node that failed to be added is being deleted.
Scaling up	The storage space of instance nodes is being expanded.
Enabling audit policy	The instance audit policy is being enabled.
Changing instance class	The CPU or memory of a DB instance is being changed.
Checking restoration	The backup of the current DB instance is being restored to a new DB instance.
Changing private IP address	The private IP address of a node is being changed.
Changing port	The DB instance port is being changed.
Changing a security group	The security group is being changed.
Changing AZ	Data is being migrated from an AZ to another AZ in the same region.

Read Replica

To improve the read capability of the primary node, DDS provides read replicas that can be accessed independently, which is good for handling read-intensive workloads and reducing memory pressure on the primary node. You can also create one or more read replicas to process a large number of read requests and improve throughput.

Differences Between Read Replica and Secondary Node

Node	Description	Application Scenario
Secondary nodes	The secondary node of a replica set instance ensures high availability. If a primary node is faulty, the system automatically switches traffic to the secondary node. If the primary node is faulty, each secondary node may be elected as a new primary node to execute data write requests.	DDS provides an HA connection address to connect to both the primary and secondary nodes and separate read and write operations. In this way, a DDS instance can handle heavy read workloads with ease. In addition, the impact of node faults on services is wakened while the performance is improved.
Read replicas	A read replica in a replica set instance synchronizes data only from the primary node. It does not ensure high availability and will not be elected as the primary node. Read replicas can be connected independently and do not interfere with primary nodes.	Read replicas are useful when applications need to read large amounts of data from existing instances.

Constraints

Only replica set instances can have read replicas.
Instances that only have read replicas cannot be created.
The DDS instance version must be 4.0 or later.
Read replicas are used only for processing read requests and do not participate in primary/secondary node election.
A maximum of five read replicas can be added to a replica set instance.
Data is asynchronously replicated between the primary node and the read replica, and this process will delay by a few seconds.

Functions

You can change the number of read replicas to meet fluctuating service demands and reduce service costs.
The specifications of a read replica are the same as those of the primary node. Data is automatically synchronized to the read replica.
Resources on the primary node are not occupied. Adding or deleting read replicas does not affect services on the primary node.
Read replicas can be connected independently and do not interfere with existing primary and secondary nodes.
You can monitor the performance of read replicas.

Huawei Cloud Stack 8.5.0 Solution Description 04

DB Instance Classes

Cluster

Replica Set

Single Node

DB Engines and Versions

DB Instance Statuses

DB Instance Statuses

Read Replica

Differences Between Read Replica and Secondary Node

Constraints

Functions

Related Documents

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Huawei Cloud Stack 8.5.0 Solution Description 04

DB Instance Description

DB Instance Classes

Cluster

Replica Set

Single Node

DB Engines and Versions

DB Instance Statuses

DB Instance Statuses

Read Replica

Differences Between Read Replica and Secondary Node

Constraints

Functions

Related Documents

Digital Signature File

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