This topic introduces the features of shared instance families and their instance types.

Shared instances use a CPU-unbound scheduling scheme. Each vCPU is randomly allocated to an idle CPU hyperthread. The vCPUs of different instances compete for CPU resources. This results in fluctuations in computing performance when traffic loads are heavy. Shared instances can only guarantee availability but not performance in the SLA. Compared with enterprise-grade instances that have exclusive resources, shared instances only share resources. Therefore, shared instances cannot guarantee consistent computing performance but they have a lower cost.

s6, shared standard instance family

Features:
  • More cost-effective than the previous-generation shared instance families (xn4, n4, mn4, and e4).
  • Equipped with 2.5 GHz Intel ® Xeon ® Platinum 8269CY (Cascade Lake), with Turbo Boost up to 3.2 GHz for consistent computing performance.
  • Paired with DDR4 memory.
  • Supports multiple CPU-to-memory ratios, such as 1:1, 1:2, and 1:4.
  • I/O-optimized.
  • Supports enhanced SSDs, standard SSDs, and ultra disks.
  • Supports only Virtual Private Cloud (VPC).
  • Scenarios:
    • Small and medium-sized websites, and web applications
    • Development environments, servers, code repositories, microservices, and testing and staging environments
    • Lightweight databases and caches
    • Lightweight enterprise applications and integrated application services
The following table describes the instance types that belong to the s6 instance family and specifications of these instance types.
Instance type vCPUs Memory (GiB) Local storage (GiB) Base bandwidth (Gbit/s) Packet forwarding rate (Kpps) IPv6 support NIC queues ENIs (including one primary ENI) Private IP addresses per ENI
ecs.s6-c1m1.small 1 1.0 None 0.1 150 Yes 1 2 2
ecs.s6-c1m2.small 1 2.0 None 0.1 150 Yes 1 2 2
ecs.s6-c1m4.small 1 4.0 None 0.1 150 Yes 1 2 2
ecs.s6-c1m2.large 2 4.0 None 0.2 200 Yes 1 2 2
ecs.s6-c1m4.large 2 8.0 None 0.4 200 Yes 1 2 2
ecs.s6-c1m2.xlarge 4 8.0 None 0.4 300 Yes 1 2 6
ecs.s6-c1m4.xlarge 4 16.0 None 0.8 300 Yes 1 2 6
ecs.s6-c1m2.2xlarge 8 16.0 None 0.8 600 Yes 1 2 6
ecs.s6-c1m4.2xlarge 8 32.0 None 1.2 600 Yes 1 2 6
Note
  • To bind or unbind an ENI, instances of the following instance types must be in the stopped state: ecs.s6-c1m1.small, ecs.s6-c1m2.large, ecs.s6-c1m2.small, ecs.s6-c1m4.large, and ecs.s6-c1m4.small.
  • 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 the specifications, see Instance specifications.

Previous-generation shared instance families

Features of xn4, n4, mn4, and e4:
  • Equipped with 2.5 GHz Intel ® Xeon ® E5-2682 v4 (Broadwell) processors.
  • Paired with DDR4 memory.
  • Supports multiple CPU-to-memory ratios.
Instance family Feature vCPU-to-memory ratio Scenario
xn4 Shared compact type 1:1
  • Frontend web applications
  • Lightweight applications and microservices
  • Applications for development or testing environments
n4 Shared compute type 1:2
  • Websites and web applications
  • Development environments, servers, code repositories, microservices, and testing and staging environments
  • Lightweight enterprise applications
mn4 Shared balanced type 1:4
  • Websites and web applications
  • Lightweight databases and caches
  • Integrated applications and lightweight enterprise services
e4 Shared memory type 1:8
  • Applications that require a large memory
  • Lightweight databases and caches
The following table describes the instance types that belong to the xn4 instance family and specifications of these instance types.
Instance type vCPUs Memory (GiB) Local storage (GiB) Bandwidth (Gbit/s) Packet forwarding rate (Kpps) IPv6 support NIC queues ENIs (including one primary ENI) Private IP addresses per ENI
ecs.xn4.small 1 1.0 None 0.5 50 No 1 2 2
Note
The following table describes the instance types that belong to the n4 instance family and specifications of these instance types.
Instance type vCPUs Memory (GiB) Local storage (GiB) Bandwidth (Gbit/s) Packet forwarding rate (Kpps) IPv6 support NIC queues ENIs (including one primary ENI) Private IP addresses per ENI
ecs.n4.small 1 2.0 None 0.5 50 No 1 2 2
ecs.n4.large 2 4.0 None 0.5 100 No 1 2 2
ecs.n4.xlarge 4 8.0 None 0.8 150 No 1 2 6
ecs.n4.2xlarge 8 16.0 None 1.2 300 No 1 2 6
ecs.n4.4xlarge 16 32.0 None 2.5 400 No 1 2 6
ecs.n4.8xlarge 32 64.0 None 5.0 500 No 1 2 6
Note
The following table describes the instance types that belong to the mn4 instance family and specifications of these instance types.
Instance type vCPUs Memory (GiB) Local storage (GiB) Bandwidth (Gbit/s) Packet forwarding rate (Kpps) IPv6 support NIC queues ENIs (including one primary ENI) Private IP addresses per ENI
ecs.mn4.small 1 4.0 None 0.5 50 No 1 2 2
ecs.mn4.large 2 8.0 None 0.5 100 No 1 2 2
ecs.mn4.xlarge 4 16.0 None 0.8 150 No 1 2 6
ecs.mn4.2xlarge 8 32.0 None 1.2 300 No 1 2 6
ecs.mn4.4xlarge 16 64.0 None 2.5 400 No 1 2 6
ecs.mn4.8xlarge 32 128.0 None 5.0 500 No 2 8 6
Note
The following table describes the instance types that belong to the e4 instance family and specifications of these instance types.
Instance type vCPUs Memory (GiB) Local storage (GiB) Bandwidth (Gbit/s) Packet forwarding rate (Kpps) IPv6 support NIC queues ENIs (including one primary ENI) Private IP addresses per ENI
ecs.e4.small 1 8.0 None 0.5 50 No 1 2 2
ecs.e4.large 2 16.0 None 0.5 100 No 1 2 2
ecs.e4.xlarge 4 32.0 None 0.8 150 No 1 2 6
ecs.e4.2xlarge 8 64.0 None 1.2 300 No 1 3 6
ecs.e4.4xlarge 16 128.0 None 2.5 400 No 1 8 6
Note

References