This topic describes the features of shared instance families and lists the instance types of each instance family.

Previous-generation shared instance families xn4, n4, mn4, and e4

Shared instances use a CPU-unbound scheduling scheme. Each vCPU is randomly allocated to an idle CPU hyperthread. vCPUs of different instances compete for CPU resources, which causes computing performance to fluctuate when traffic loads are heavy. Shared instances can guarantee availability but cannot guarantee the performance that may be required in the service level agreement (SLA). Different from enterprise-level instances that have exclusive resources, shared instances share resources. Therefore, shared instances cannot ensure consistent computing performance but offer lower costs.
Note Burstable instances are also shared instances. For more information, see Overview.

Previous-generation shared instance families xn4, n4, mn4, and e4

Features
  • Offers multiple CPU-to-memory ratios.
  • Uses 2.5 GHz Intel® Xeon® E5-2682 v4 (Broadwell) processors.
  • Uses DDR4 memory.
Instance family Description vCPU-to-memory ratio Scenario
xn4 Shared compact instance family 1:1
  • Frontend web applications
  • Lightweight applications and microservices
  • Development and testing environments
n4 Shared compute instance family 1:2
  • Websites and web applications
  • Development environments, servers, code repositories, microservices, and testing and staging environments
  • Lightweight enterprise applications
mn4 Shared general-purpose instance family 1:4
  • Websites and web applications
  • Lightweight databases and caches
  • Integrated applications and lightweight enterprise services
e4 Shared memory instance family 1:8
  • Applications that require a large memory
  • Lightweight databases and caches
xn4
Instance type vCPUs Memory (GiB) Bandwidth (Gbit/s) Packet forwarding rate (pps) NIC queues ENIs Private IP addresses per ENI
ecs.xn4.small 1 1.0 0.5 50,000 1 2 2
Note
  • Secondary elastic network interfaces (ENIs) cannot be bound to instances of this instance family while the instances are being created, and can be bound after the instances are created. When you bind secondary ENIs to or unbind them from an ecs.xn4.small instance, the instance must be in the Stopped state.
  • You can go to the ECS Instance Types Available for Each Region page to view the instance types available in each region.
  • For more information about these specifications, see Description of instance type specifications.
n4
Instance type vCPUs Memory (GiB) Bandwidth (Gbit/s) Packet forwarding rate (pps) NIC queues ENIs Private IP addresses per ENI
ecs.n4.small 1 2.0 0.5 50,000 1 2 2
ecs.n4.large 2 4.0 0.5 100,000 1 2 2
ecs.n4.xlarge 4 8.0 0.8 150,000 1 2 6
ecs.n4.2xlarge 8 16.0 1.2 300,000 1 2 6
ecs.n4.4xlarge 16 32.0 2.5 400,000 1 2 6
ecs.n4.8xlarge 32 64.0 5.0 500,000 1 2 6
Note
  • Secondary ENIs cannot be bound to instances of this instance family while the instances are being created, and can be bound after the instances are created. When you bind secondary ENIs to or unbind them from an ecs.n4.small or ecs.n4.large instance, the instance must be in the Stopped state.
  • You can go to the ECS Instance Types Available for Each Region page to view the instance types available in each region.
  • For more information about these specifications, see Description of instance type specifications.
mn4
Instance type vCPUs Memory (GiB) Bandwidth (Gbit/s) Packet forwarding rate (pps) NIC queues ENIs Private IP addresses per ENI
ecs.mn4.small 1 4.0 0.5 50,000 1 2 2
ecs.mn4.large 2 8.0 0.5 100,000 1 2 2
ecs.mn4.xlarge 4 16.0 0.8 150,000 1 2 6
ecs.mn4.2xlarge 8 32.0 1.2 300,000 1 2 6
ecs.mn4.4xlarge 16 64.0 2.5 400,000 1 2 6
ecs.mn4.8xlarge 32 128.0 5 500,000 2 8 6
Note
  • Secondary ENIs cannot be bound to instances of this instance family while the instances are being created, and can be bound after the instances are created. When you bind secondary ENIs to or unbind them from an ecs.mn4.small or ecs.mn4.large instance, the instance must be in the Stopped state.
  • You can go to the ECS Instance Types Available for Each Region page to view the instance types available in each region.
  • For more information about these specifications, see Description of instance type specifications.
e4
Instance type vCPUs Memory (GiB) Bandwidth (Gbit/s) Packet forwarding rate (pps) NIC queues ENIs Private IP addresses per ENI
ecs.e4.small 1 8.0 0.5 50,000 1 2 2
ecs.e4.large 2 16.0 0.5 100,000 1 2 2
ecs.e4.xlarge 4 32.0 0.8 150,000 1 2 6
ecs.e4.2xlarge 8 64.0 1.2 300,000 1 3 6
ecs.e4.4xlarge 16 128.0 2.5 400,000 1 8 6
Note
  • Secondary ENIs cannot be bound to instances of this instance family while the instances are being created, and can be bound after the instances are created. When you bind secondary ENIs to or unbind them from an ecs.e4.small or ecs.e4.large instance, the instance must be in the Stopped state.
  • You can go to the ECS Instance Types Available for Each Region page to view the instance types available in each region.
  • For more information about these specifications, see Description of instance type specifications.

References