Limits

Last Updated: Apr 27, 2018

When using ECS, consider the following:

  • ECS does not support virtual application installation or subsequent virtualization such as when using VMware. Currently, only ECS Bare Metal Instances supports virtualization.
  • ECS does not support sound card applications.
  • ECS does not support the installation of external hardware devices such as hardware dongles, USB drives, external hard drives, and the USB security keys issued by banks.
  • ECS does not support SNAT and other IP packet address translation services. You can achieve this by using an external VPN or proxy.
  • ECS does not support multicast protocol. If multicasting services are required, we recommend that you use unicast point-to-point method.
  • Currently, Log Service does not support 32-bit Linux ECS instance. To know the regions that support Log Service, see Service endpoint. To know the server operating systems that support Log Service, see Logtail collection overview.

Besides the preceding limit, the additional limits of ECS are mentioned in the following table.

ECS instances

Item Limit Supply for higher configuration or unlock configuration rights
Permission to create instances Complete real-name registration to create ECS instances in the mainland China regions Not supported
Default quota of Pay-As-You-Go ECS instances in all regions for one account 10 Open a ticket
Default quota of spot instances in all regions for one account Sharing the Pay-As-You-Go ECS instance quota Open a ticket
Conversion of the billing method from Pay-As-You-Go to Subscription Not supported in the following instance types or type families:
  • Generation II: n1, ne2, and e3
  • All instance types of Generation I
Not supported
Default available instance types for creating Pay-As-You-Go ECS instances (New generation) ecs.t1.small (1 vCPU core, 1 GiB) Open a ticket
ecs.s1.small (1 vCPU core, 2 GiB)
ecs.s1.medium (1 vCPU core, 4 GiB)
ecs.s2.small (2 vCPU core, 2 GiB)
ecs.s2.large (2 vCPU core, 4 GiB)
ecs.s2.xlarge (2 vCPU core, 8 GiB)
ecs.s3.medium (4 vCPU core, 4 GiB)
ecs.s3.large (4 vCPU core, 8 GiB)
ecs.m1.medium (4 vCPU core, 16 GiB)
Default available instance types for creating Pay-As-You-Go ECS instances (Previous generation) ecs.n1.tiny (1 vCPU core, 1 GiB) Open a ticket
ecs.n1.small (1 vCPU core, 2 GiB)
ecs.n1.medium (2 vCPU core, 4 GiB)
ecs.n1.large (4 vCPU core, 8 GiB)
ecs.n2.small (1 vCPU core, 4 GiB)
ecs.n2.medium (4 vCPU core, 8 GiB)
ecs.n2.large (4 vCPU core, 16 GiB)
ecs.e3.small (1 vCPU core, 8 GiB)
ecs.e3.medium (2 vCPU core, 16 GiB)

Block storage

Item Limit Supply for higher configuration or unlock configuration rights
Quota of Pay-As-You-Go cloud disks in all regions for one account Five times of the number of Pay-As-You-Go instances in all regions under one account Open a ticket
Quota of system disks for one ECS instance 1 Not supported
Quota of data disks for one ECS instance 16 (including cloud disks and Shared Block Storage) Not supported
Multi-node attachment of shared block storage 16 instances. Four instances supported during public beta. Not supported
Quota of shared block storage in all regions for one account 10 Open a ticket
Capacity of one Basic Cloud Disk 5 GiB ~ 2,000 GiB Not supported
Capacity of one SSD Cloud Disk 20 GiB ~ 32,768 GiB Not supported
Capacity of one Ultra Cloud disk 20 GiB ~ 32,768 GiB Not supported
Capacity of one ephemeral SSD disk 5 GiB ~ 800 GiB Not supported
Capacity of ephemeral SSD disks on one ECS instance 1,024 GiB Not supported
Capacity of one NVMe SSD local disk 1,456 GiB Not supported
Capacity of NVMe SSD local disks on one ECS instance 2,912 GiB Not supported
Capacity of one SATA HDD local disk 5,500 GiB Not supported
Capacity of SATA HDD local disks on one ECS instance 154,000 GiB Not supported
Capacity of one SSD Shared Block Storage device 32,768 GiB Not supported
Capacity of SSD Shared Block Storage devices on one ECS instance 128 TiB Not supported
Capacity of one Ultra Shared Block Storage device 32,768 GiB Not supported
Capacity of Ultra Shared Block Storage devices on one ECS instance 128 TiB Not supported
Size limit of one system disk Windows: 40 GiB − 500 GiB
Linux (excluding CoreOS)+ FreeBSD: 20 GiB − 500 GiB
CoreOS: 30 GiB − 500 GiB
Not supported
Size limit of one data disk Basic Cloud Disk: 5 GiB − 2,000 GiB
SSD Cloud Disk/Ultra Cloud Disk/SSD Shared Block Storage/Ultra Shared Block Storage: 20 GiB − 32,768 GiB
Local disk: See Local disks
Not supported
Attaching an independent local disk to an ECS instance with local disks Not supported Not supported
Configuration changes of an ECS instance with local disks Only changes to public network bandwidth are permitted Not supported
Mount point for system disks /dev/xvda Not supported
Mount points for data disks /dev/xvd[b-z] Not supported

Snapshots

Item Limit Supply for higher configuration or unlock configuration rights
Quota of snapshots Number of elastic block storage devices * 64 Not supported

Images

Item Limit Supply for higher configuration or unlock configuration rights
Quota of custom images in all regions for one account 100 Open a ticket
Quota of accounts to share one custom image 100 Open a ticket
Requirements of images for instance types 32-bit images are not supported on an instance with 4 GiB or more RAM. Not supported

Key pairs

Item Limit Supply for higher configuration or unlock configuration rights
Quota of key pairs in all regions for one account 500 Not supported
Instance types supporting key pairs All instance types, except those non-I/O optimized instance types in Generation I Not supported
Images supporting key pairs Linux images only Not supported

Public network bandwidth

Item Limit Supply for higher configuration or unlock configuration rights
Maximum inbound Internet bandwidth 200 Mbit/s Not supported
Maximum outbound Internet bandwidth 100 Mbit/s Open a ticket to increase the limit to 200 Mbit/s
Limits on changing the assigned public IP address for one ECS instance The instance has existed for less than six hours. You can change the public IP address of an instance three times. Not supported

Security groups

Item Limit Supply for higher configuration or unlock configuration rights
Quota of ECS instances for one security group 1,000 Not supported
Quota of rules for one security groups 100 Not supported
Quota of security groups in all regions for one account 100 Open a ticket
Quota of security groups for one ECS instances 5 Not supported
Port Access to TCP Port 25, which is the default port for the STMP service, is denied. It cannot be allowed by adding a security group rule. Open a ticket. For more information, see Apply to open TCP port 25

ENI

Item Limit Supply for higher configuration or unlock configuration rights
Quota of ENI in one region for one account 100 Open a ticket

Tags

Item Limit Supply for higher configuration or unlock configuration rights
Quota of tags for one ECS instance 10 Not supported

API

Item Limit Supply for higher configuration or unlock configuration rights
Invocation quota of CreateInstance At most 200 times per minute Open a ticket

For more information about the limits for VPC, see Limits in the VPC Product Introduction.

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