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Elastic Compute Service

Overview

Limits

Limits

This topic describes the default quota limits for ECS-related resources.

Instance

Limit item	Upper limit	Changeable
Max. ECS instances that can be created at one time	100	No
Max. vCPUs or GPUs available for an instance type family configured with a specified billing method within a single availability zone for each account For information about quota items associated with instance type families, see Description of ECS instance type quota items.	Please go to the Quota Center of Volcano Engine to view.	Yes. To increase the vCPU quota, please apply at the Quota Center.
Does an ECS instance with a local volume support custom mounting of a new volume?	No. Local volumes are created and destroyed along with the ECS instance.	-

RI

Limit item	Upper limit	Changeable
Max. vCPUs available for all regional RIs held by an account in a region	200	Yes, the product is currently in Beta. If you need to increase the vCPU quota, please contact your account manager to apply.
Max. vCPUs available for all Zonal RIs held by an account in an availability zone	200	Yes. To increase the vCPU quota, please apply at the Quota Center.
Instance types supported by Reserved Instances (RI)	Refer to Purchase Reserved Instances (RI).	-
Reserved Instances (RI) that do not support changing instance type	Refer to Changing Reserved Instances, and this type only supports purchasing Zonal RI.	-

Elastic Scheduled Instances

Limit item	Upper limit	Changeable
Instance types available for reservation	Please refer to Elastic Scheduled Instances (ESI) overview.	-
Max. vCPUs an account can use in an availability zone	300	Yes. To increase the vCPU quota, please apply at the Quota Center.
The maximum number of instances that can be reserved and purchased at one time	500	-

Image

Limit item	Description of Limit	Changeable
Maximum size of an image file that can be imported	2 TiB	No
Image format	QCOW2, RAW, VHD, VMDK	No
Maximum number of VolcanoEngine accounts that a single custom image can be shared with	50	No
Number of custom images that a single account can create in a single region	50	Yes. If you want to increase your custom image quota, go to Quota Center and submit a quota increase application.

Volume

Limit item	Upper limit	Changeable
Max. volumes that can be attached per ECS instance	The number of volumes that can be attached to instances of different instance types varies. For more information, refer to Instance types. If you have created an ECS instance by using a CentOS 6.x image, a maximum of 8 volumes can be attached (including 1 system volume).	No
Capacity of a single system volume	PTSSD: 40 GiB to 500 GiB ESSD: 40 GiB to 2,048 GiB	No
Capacity of a single data volume	PTSSD: 20 GiB to 8,192 GiB ESSD: 20 GiB to 32,768 GiB	No
Maximum usage per volume type	ESSD PL0: Maximum usage of 64TiB for each root user in a region. ESSD FlexPL: Maximum usage of 10TiB for each root user in a region.	Yes. To increase the quota for volume capacity, please apply at the Quota Center.

Snapshot

Limit item	Upper limit	Changeable
Maximum number of manual snapshots that can be created per volume	Up to 256 manual snapshots can be created for each volume.	No
Max. automatic snapshots that can be created per volume	Up to 1024 automatic snapshots can be created for each volume.	No

Network interface

Limit item	Upper limit	Changeable
Max. primary ENIs that can be attached per ECS instance	1	No
Max. ENIs (primary and secondary) that can be attached per instance	The number of network interfaces that can be mounted to an ECS instance varies based on the instance type. For more information, see Instance type overview.	No
Number of private IP addresses and EIPs for a single network interface	Primary private IP addresses: 1 Secondary private IP addresses: Up to 9 secondary private IP addresses are supported for an ENI that is not attached to an ECS instance. The number of secondary private IP addresses that can be attached to an ENI depends on the instance types. For more information, refer to Instance types. EIP: The number of EIPs depends on the number of private IP addresses (primary and secondary) on the ENI. Each private IP address can be attached to an EIP.	No

Security group

Limit item	Upper limit	Changeable
The maximum number for an ECS instance	Each ENI can be associated with up to 5 security groups.	No

Key pair

Limit item	Upper limit	Changeable
Operating systems	Only the Linux operating system is supported.	-
Max. key pairs for an account in a region	500	No
The maximum number for an ECS instance	Only one key pair can be associated on the console. If you need multiple key pairs, manually modify the ~/.ssh/authorized_keys file inside the instance to add multiple key pairs.	-

Deployment set

Limit item	Description of Limit	Changeable
Maximum number of instances in a single deployment set	The number of instances that can be created within a deployment set varies based on the deployment policy: Availability Limit for an availability zone: 5 instances. Limit for a region: 5 instances * Number of availability zones in the region. Availability Group policy: Limit for an availability zone: A deployment set can be divided into a maximum of 7 groups, with the total number of instances created in these 7 groups not exceeding 60. Limit for a region: 60 instances x Number of availability zones in the region.	Yes. If you need to change the quota, please contact your account manager.
Types of instances that can be created within the deployment set	You can call the DescribeDeploymentSetSupportedInstanceTypeFamily operation to query the instance type families that support deployment set.	-

EIP

Limit item	Description of Limit	Changeable
Max. EIPs that can be applied for an account in a region	20	Yes. To increase the EIP quota, please apply at the Quota Center.
ISPs	BGP (Multi-ISP)	-
Bandwidth upper limit	Apply for an EIP: Pay-as-you-go (pay-by-bandwidth): 500 Mbps Pay-as-you-go (pay-by-data-transfer): 200 Mbps Subscription: 500 Mbps Modify an EIP: Pay-as-you-go (pay-by-bandwidth): 1,000 Mbps Pay-as-you-go (pay-by-data-transfer): 200 Mbps Subscription: 1,000 Mbps	No
Number of EIPs that can be associated	The number of EIPs that can be associated with an instance depends on the number of attachable ENIs and the number of private IP addresses (primary and secondary) on the ENIs.	No
Number of EIPs that can be added to a single bandwidth package	100	Yes. If you need to increase the quota of EIPs that can be added to a Shared Bandwidth Package, please apply at the Quota Center.

Tag

Limit item	Upper limit	Changeable
The maximum number for an ECS instance	50	No

Last updated: 2026.10.14 17:31:59