ECS usage limits and quotas

The Elastic Compute Service (ECS) may impose certain limitations on product features, service performance, and associated quotas. Some limitations can be addressed by requesting quota increases. It is advisable to understand these limitations before actual deployment, to plan accordingly, and to either apply for quota increases or pre-emptively manage unavoidable limitations to ensure ECS meets your business requirements. This topic describes ECS limitations and how to request quota increases for some of them.

Table dimension description

The tables in each module of this topic provide details on specific limitations. The dimensions explained in the tables are as follows:

Limitation item: Refers to product features, service performance, or related quotas that are subject to limitations.

Note

'Quota' denotes the maximum value of cloud resources or the maximum number of operations that a single Alibaba Cloud account (primary account) can utilize.
Limitation: Specifies the particular limitations for the current limitation item.

For ECS-related quotas, a corresponding quota ID is provided. You can check the quota for the limitation item using this ID, which represents the current maximum limit.
Quota increase method: Indicates whether the limitation for the current item can be addressed.

If the limitation cannot be addressed, it should be managed in advance. If it can be addressed, you can apply for an increase using the specified method.

Instances

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
vCPU quota item	The maximum number of vCPUs for a specific instance family that a single Alibaba Cloud account can hold in a specific region and billing method (subscription, pay-as-you-go, preemptible). For specific limitations, see vCPU quota item.	View or increase ECS instance type quota
GPU card and vGPU quota item	The maximum number of GPU cards or vGPU instances for a specific instance family that a single Alibaba Cloud account can hold in a specific region and billing method (subscription, pay-as-you-go, preemptible). For specific limitations, see GPU card and vGPU quota item.	View or increase ECS instance type quota
The maximum number of subscription instances that a single Alibaba Cloud account can purchase in a specific region at one time	Please refer to the quota ID `q_prepaid-instance-count-per-once-purchase` to view the corresponding quota. For specific operations, see View or increase ECS quota.	None
Change from pay-as-you-go to subscription	No quantity or amount limit. Discontinued instance types do not support changing from pay-as-you-go to subscription. For more information, see Change from pay-as-you-go to subscription.	None
Change from subscription to pay-as-you-go	Changing from subscription to pay-as-you-go will generate a refund, and the refund will consume the refund quota. Therefore, if the refund quota for the month is exceeded, you cannot perform the refund operation, that is, you cannot change from subscription to pay-as-you-go. For more information, see Change from subscription to pay-as-you-go. Note The refund quota is based on the display on the conversion page, and the quota is automatically reset to zero on the 1st of the next month.	None
Instance families that support secondary virtualization	Only ECS Bare Metal Instance and Super Computing Cluster support secondary virtualization. Other instance families do not support the installation of virtualization software and secondary virtualization.	None
Sound card applications	Sound card applications are not supported.	None
Loading external hardware devices	Direct loading of external hardware devices (such as hardware dongles, USB flash drives, external hard disks, bank U keys, etc.) is not supported. You can try software dongles or two-factor authentication based on dynamic passwords.	None
Multicast protocol	Multicast protocol is not supported. If you need to use multicast, it is recommended to use unicast point-to-point instead.	None
Website filing	If you need to file a website or app, you must purchase a subscription ECS instance for 3 months or more, and each ECS instance can file up to 5 websites or apps. For details, see Filing server check.	None
License	Some software or application licenses need to be bound to the hardware information of ECS. The migration operation of ECS may cause changes in hardware information, which may lead to license invalidation.	None

VCPU quota item

Note

When viewing quotas, the corresponding number of quotas represents the maximum number of vCPUs for a single Alibaba Cloud account in the current region, not the total maximum number of vCPUs across all regions.

GPU card and vGPU quota item

Note

When viewing quotas, the corresponding number of quotas is the maximum number of GPU cards or vGPU instances for a single Alibaba Cloud account in the current region, not the total maximum number of GPU cards or vGPU instances in all regions.

Images

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of custom images that a single Alibaba Cloud account can retain in a specific region	Please refer to the quota ID `q_user-image-count` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Maximum number of users that a single custom image can be shared with	Please refer to the quota ID `q_user-per-image-shared-user-count` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Limitations of images and instance types	Instance types with 4 GiB or more memory do not support 32-bit images.	None

For more information on images, see the Image Overview.

Block storage

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Number of system disks on a single instance	1	None
Number of data disks on a single instance	The maximum number of cloud disks supported by different instance types varies. For more information, see Instance family. Note When creating an instance, you can attach up to 1 system disk and 16 data disks. If the instance requires more data disks, you need to attach them after creating the instance. The maximum number of cloud disks supported by different instance types can be queried through the DescribeInstanceTypes interface.	None
Cloud disk capacity quota for a single Alibaba Cloud account in a specific region and zone	The capacity quota of different types of cloud disks varies. You can view the corresponding quota for each type of cloud disk. For specific operations, see View or increase block storage quota.	View or increase block storage quota
Capacity of a single basic disk	5 GiB to 2,000 GiB	None
Capacity of a single standard SSD	20 GiB to 32,768 GiB	None
Capacity of a single ultra disk	20 GiB to 32,768 GiB	None
Capacity of a single ESSD	PL0: 1 GiB to 65,536 GiB PL1: 20 GiB to 65,536 GiB PL2: 461 GiB to 65,536 GiB PL3: 1,261 GiB to 65,536 GiB	None
Capacity of a single ESSD AutoPL disk	1 GiB to 65,536 GiB	None
Single ESSD Entry disk	10 GiB to 32,768 GiB	None
Capacity of a single zone-redundant ESSD	1 GiB to 65,536 GiB	None
Capacity of a single local standard SSD	5 GiB to 800 GiB	None
Total capacity of all local standard SSDs on an instance	1,024 GiB	None
Capacity of a single ephemeral disk	64 GiB to 8,192 GiB	None
Capacity of a single system disk	Windows Server: 40 GiB to 2,048 GiB FreeBSD: 30 GiB to 2,048 GiB Linux distributions excluding CoreOS: 20 GiB to 2,048 GiB Note Basic disks (previous generation of disks, gradually discontinued) have a capacity upper limit of 500 GiB when used as system disks.	None
Permissions to attach new local disks to instances that are equipped with local disks	Not allowed.	None
Permissions to change the configurations of instances that are equipped with local disks	Only bandwidth configurations can be changed.	None
Mount point of the system disk on a Linux instance	`/dev/vda`	None
Mount points of data disks on a Linux instance	The naming of mount points varies based on the number of data disks: 1 to 25 data disks: `/dev/xvd[b-z]`. More than 25 data disks: `/dev/xvd[aa-zz]`. For example, the 26th data disk will be named `/dev/xvdaa`, the 27th data disk will be `/dev/xvdab`, and so on.	None

Note

Block storage is quantified using binary units, which denote data sizes based on a base of 1024. For instance, 1 GiB is equivalent to 1,024 MiB.

For more information about block storage, see Block Storage Overview.

Snapshots

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Number of manual snapshots that can be retained for a single cloud disk	256	None
Number of automatic snapshots that can be retained for a single cloud disk	1,000	None
Number of automatic snapshot policies that can be retained for a single Alibaba Cloud account in a single region	100	None
Number of automatic snapshot policies that can be set for a single cloud disk	1	None
Number of concurrent snapshot creations for a single cloud disk	1	None
Block storage type	local disks, and ephemeral disks do not support snapshot creation. Currently, only ESSD series disks (ESSD, ESSD AutoPL, and ESSD Entry) support the snapshot consistency group feature, and the disks must not have the multi-attach feature enabled. Only ESSD series disks (ESSD, ESSD AutoPL, ESSD Entry, and zone-redundant ESSD) support the snapshot rapid availability capability. For more information, see Snapshot rapid availability capability.	None
Download or export snapshots	Downloading or exporting created snapshots is not supported. You can first create a custom image from a snapshot, and then export the custom image to your local device.	None
Constraints on the process of creating manual and automatic snapshots	If a snapshot is being manually or automatically created for a cloud disk when the point in time specified in the associated automatic snapshot policy is reached, the automatic snapshot cannot be created based on the policy at the point in time. An automatic snapshot is created for the disk at the next point in time specified in the automatic snapshot policy. If an automatic snapshot is being created for a cloud disk, you cannot create a manual snapshot for the disk. Wait until the automatic snapshot is created.	None

For more information on snapshots, see the Snapshot Overview.

SSH key pairs

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
SSH key pair quota for a single Alibaba Cloud account in a single region	500	None
Image types that support SSH key pairs	Only Linux operating systems are supported.	None

For more information on SSH key pairs, see Managing SSH Key Pairs.

Public bandwidth

The combined peak public bandwidth limit for all pay-as-you-go and preemptible instances billed by fixed bandwidth under a single Alibaba Cloud account in one region is:

Note

If you require higher bandwidth, you can check and request a quota increase by referencing quota ID q_internet-bandwidth-pay-by-bandwidth-of-postpaid-instance. For detailed instructions, see View or increase ECS quota.

Region name
Limitation
Region name
Limitation
China (Beijing), China (Shanghai), China (Hangzhou), China (Shenzhen)
50 Gbps
Hong Kong (China), Singapore
20 Gbps
Others
10 Gbps

As of November 27, 2020, the peak bandwidth is subject to the account throttling policy when creating or modifying ECS instances:

Note

If you require increased peak bandwidth, you can , submit a ticket, or .
- Within a single region, the total actual peak bandwidth for all pay-by-traffic billed ECS instances under a single Alibaba Cloud account must not exceed 5 Gbps.
- In one region, the actual peak bandwidth in operation for all ECS instances billed by fixed bandwidth under a single Alibaba Cloud account must not exceed 50 Gbps.

Limits on single instance bandwidth peak and public IP replacement:

Important

The inbound and outbound bandwidth peaks in the Pay-by-traffic billing mode represent upper limits and are not guaranteed service levels. Bandwidth peaks may be restricted during times of resource contention. For guaranteed bandwidth, please opt for the Fixed Bandwidth billing mode.

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Single instance inbound bandwidth peak	When the purchased outbound bandwidth peak is less than or equal to 10 Mbit/s, Alibaba Cloud will allocate 10 Mbit/s inbound bandwidth. When the purchased outbound bandwidth peak is greater than 10 Mbit/s, Alibaba Cloud will allocate inbound bandwidth equal to the purchased outbound bandwidth peak.	None
Single instance outbound bandwidth peak	Pay-by-traffic: Subscription instance: 200 Mbit/s Pay-as-you-go instance: 100 Mbit/s Fixed bandwidth billing: 200 Mbit/s Note The outbound bandwidth peak of a single instance is also limited by the Network Bandwidth Base/burst (gbit/s) indicator data of the ECS instance type. For more information, see Instance family.	None
Limit on changing the assigned public IP address of a single instance	The public IP address of a newly created instance can be changed within 6 hours, and an instance can be changed up to three times.	None

For more information about public bandwidth, see Public bandwidth.

Elastic network interfaces

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of elastic network interfaces (secondary network interfaces) that can be created by a single Alibaba Cloud account in a specific region	Please refer to the quota ID `q_elastic-network-interfaces` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
VPC and zone restrictions for binding elastic network interfaces to instances	Instances and the bound elastic network interfaces must belong to the same VPC and zone. Multiple elastic network interfaces bound to an instance can belong to different subnets (vSwitches) within the same VPC and zone. If two or more network interfaces from the same subnet are attached to an instance, network issues such as asymmetric routing may occur. You can assign one or more secondary private IP addresses to a primary or secondary elastic network interface to optimize the usage of ECS instances deployed in VPCs and divert traffic during a failover. For more information, see Secondary private IP.	None
Maximum number of elastic network interfaces that can be bound to a single instance	The number of network interfaces that can be bound to an instance is determined by the instance type. For more information, see Instance family under Elastic network interfaces.	None

For more information on elastic network interfaces, see the Elastic Network Interface Overview.

Prefix lists

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of prefix lists for a single Alibaba Cloud account in a single region	100	None
Maximum number of entries in a single prefix list	200	None
Maximum number of associated resources for a single prefix list	1,000	None

For more information on prefix lists, see the Prefix List Overview.

Security groups

Limitation item	Basic security group limitation	Enterprise security group limitation

Limitation item	Basic security group limitation	Enterprise security group limitation
Maximum number of security groups for a single Alibaba Cloud account in a specific region	Please refer to the quota ID `q_security-groups` to view or apply for an increase in the corresponding quota. For specific operations, see View or increase ECS quota.	Same as basic security group
Maximum number of ECS instances of the classic network type that a single classic network type security group can contain	1,000 Note If more than 1,000 instances of the classic network type require mutual access over the internal network, you can assign the instances to multiple security groups and allow mutual access among the security groups.	Classic network is not supported
Maximum number of ECS instances of the VPC type that a single VPC type security group can contain	Not fixed, depends on the number of private IP addresses that the security group can contain.	Unlimited
Maximum number of security groups that a single instance can be associated with	10	Same as basic security group
Maximum number of security groups that each elastic network interface of a single instance can be associated with	10	Same as basic security group
Maximum number of rules (including inbound and outbound rules) for all security groups associated with a single elastic network interface	1,000	Same as basic security group
Maximum number of authorized security group rules that can be added to a single security group	20	0 rules. In enterprise security groups, you cannot add rules with security groups as authorization objects, nor can you use enterprise security groups as authorization objects in other security group rules.
Maximum number of private IP addresses that a single VPC type security group can contain for a single Alibaba Cloud account in a specific region	6,000 Note You can also view the maximum number of private IP addresses in a VPC basic security group by referring to the quota ID `q_vpc-normal-security-group-ip-count`. For specific operations, see View or increase ECS quota. If more than 6,000 private IP addresses require mutual access over the internal network, you can assign the ECS instances with these private IP addresses to multiple security groups and allow mutual access among the security groups.	65,536
Public access port	For security reasons, port 25 of ECS instances is restricted by default. It is recommended to use the SSL encrypted port (usually port 465) to send emails externally.	Same as basic security group

For more information on security groups, see the overview of security groups.

Reserved instances

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Total number of regional reserved instances for a single Alibaba Cloud account across all regions	20	Submit a ticket
Number of zone-level reserved instances for a single Alibaba Cloud account in a single zone	20	Submit a ticket
Instance type of reserved instances	gn6i and t5 instance families do not support regional reserved instances and cannot be split or merged. Note The instance types that you can select when purchasing reserved instances are displayed on the actual interface.	None
Eligible resources	Only pay-as-you-go instances (excluding preemptible instances) are eligible for deduction. Only the fees of computing resources (vCPUs and memory) can be offset. The fees of resources such as network and storage resources cannot be offset. For more information about ECS instance billing, see Billing overview. Windows reserved instances can also offset the image fees. Note Windows reserved instances already include Windows images at no additional cost and can offset the image portion of the bill for pay-as-you-go instances running Windows operating systems.	None

For more information on reserved instances, see Reserved Instances.

Savings plans

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Number of savings plans that a single Alibaba Cloud account can purchase	200	None
Eligible resources	Only ECS and ECI pay-as-you-go instances (excluding preemptible instances) are eligible for deduction. For detailed deduction items and rules, see Savings plan deduction items and rules. For ECS instances, savings plans can be used to offset the fees for computing resources (vCPUs and memory), images, system disks, and public bandwidth. Savings plans can also be used to offset capacity fees, performance provision fees, and performance burst fees for data disks on the ECS instances. For more information about ECS instance billing, see Billing overview. For ECI instances (non-specified instance types), savings plans can be used to offset the fees for computing resources (vCPUs and memory). For more information about ECI instance billing, see ECI instance billing.	None

For more information on savings plans, see Savings Plans.

Storage capacity unit packages

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum capacity of a single storage capacity unit package that can be purchased at one time	50 TiB	Submit a ticket
Maximum number of SCUs that can be purchased in a single region	100	None
Resource types that support SCUs	ESSD, standard SSD, ultra disk, and basic disk. Capacity NAS file system and Performance NAS file system. Standard snapshot. Standard OSS, infrequent access OSS, and archive OSS. Cloud Backup storage capacity. Photo and cloud disk services.	None
Deduction type	Only pay-as-you-go bills are eligible for deduction. Bills of pay-as-you-go disks attached to preemptible instances are not eligible for deduction.	None
Effective time	You can configure an effective time for each SCU. The configured time must fall within six months of the SCU creation.	None
Create and manage SCUs through API	Not supported yet.	None

For more information on storage capacity unit packages, see Storage Capacity Unit Package (SCU).

Launch templates

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of launch templates that a single Alibaba Cloud account can have in a specific region	Please refer to the quota ID `q_launch-template-count` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Maximum number of versions for a single launch template that a single Alibaba Cloud account can have in a specific region	Please refer to the quota ID `q_launch-template-version-count` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Launch template parameters	When you create a launch template, all parameters are optional. However, if a launch template does not include required parameters such as the instance type and image, you must specify these parameters when you use the launch template to create ECS instances.	None
Modify an existing launch template	After a launch template is successfully created, it cannot be modified. You can create a new version of the launch template to change configuration parameters. For specific operations, see Manage launch template versions.	None

For more information on launch templates, see the launch template overview.

Deployment sets

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of deployment sets that a single Alibaba Cloud account can have in a specific region	Please refer to the quota ID `q_deployment-set-count` to view the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Maximum number of instances that can be contained in a single deployment set	The number of instances that can be contained in a deployment set depends on the deployment strategy you choose. For more information, see Deployment strategy.	None
Create dedicated hosts in deployment sets	Deployment sets do not support creating dedicated hosts.	None
Region and zone restrictions	Instances and deployment sets must be in the same region. Instances in a deployment set with a low network latency strategy must all be in the same zone.	None
Instance types that support deployment sets	Different deployment strategies support creating specific instance families. You can call the DescribeDeploymentSetSupportedInstanceTypeFamily API to specify a deployment strategy and obtain the instance families supported by each deployment strategy.	None
Merge deployment sets	Deployment sets cannot be merged with each other.	None

For more information on deployment sets, see Deployment Sets.

Auto provisioning groups

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Provisioning instances across regions	Auto provisioning groups do not support provisioning instances across regions.	None
Maximum number of configuration sources that can be specified for a single auto provisioning group	A single auto provisioning group can specify only one specific version of a launch template as the basic configuration for instances. However, you can extend the instance types in the template to form multiple resource pools.	None
Maximum number of resource pools that can be set for a single auto provisioning group	A single auto provisioning group supports setting up to 20 resource pools (combinations of zones and instance types).	None
Maximum number of instances that can be created under a single auto provisioning group	1,000	None

For more information on auto provisioning groups, see the Auto Provisioning Overview.

Cloud Assistant

Limitation item	Limitation	Quota increase method

Limitation item	Limitation	Quota increase method
Maximum number of Cloud Assistant commands for a single Alibaba Cloud account in a specific region	Refer to quota ID `q_axt-command-count` for the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
Cloud Assistant task output size limit for a single Alibaba Cloud account in a specific region	Refer to quota ID `q_axt-task-output-size` for the corresponding quota. For specific operations, see View or increase ECS quota.	None
Cloud Assistant task output retention period for a single Alibaba Cloud account in a specific region	Refer to quota ID `q_axt-task-output-life` for the corresponding quota. For specific operations, see View or increase ECS quota.	None
Maximum number of Cloud Assistant activation codes for managed instances for a single Alibaba Cloud account in a specific region	Refer to quota ID `q_cloud-assistant-activation-count` for the corresponding quota. For specific operations, see View or increase ECS quota.	None
Maximum number of instances that support command execution for a single Alibaba Cloud account in a specific region	Refer to quota ID `q_task-instance-count` for the corresponding quota. For specific operations, see View or increase ECS quota.	View or increase ECS quota
File size limits for created Bat, PowerShell, or Shell scripts and custom parameters after Base64 encoding	Create command: File size (after Base64 encoding) cannot exceed 18 KB. Execute and save command immediately: File size cannot exceed 18 KB. Execute but do not save command immediately: File size cannot exceed 24 KB. Upload file: File size cannot exceed 32 KB.	None
Maximum number of custom parameters in a single command	20	None
Operating systems	Cloud Assistant commands can only be run on instances with the following operating systems: Alibaba Cloud Linux CentOS 6, CentOS 7, CentOS 8, and later CoreOS Debian 8, Debian 9, Debian 10, and later OpenSUSE Red Hat 5, Red Hat 6, Red Hat 7, and later Note In Red Hat, you must manually download the RPM package to install the Cloud Assistant Agent. For specific operations, see Install Cloud Assistant Agent. SUSE Linux Enterprise Server (SLES) 11, SLES 12, SLES 15, and later Ubuntu 12, Ubuntu 14, Ubuntu 16, Ubuntu 18, and later FreeBSD 11, FreeBSD 12, FreeBSD 13, FreeBSD 14, and later Windows Server 2012, Windows Server 2016, Windows Server 2019, and later Note By default, the Cloud Assistant Agent is installed on ECS instances created from public images. For ECS instances created from custom images or Alibaba Cloud Marketplace images, verify that the operating systems support Cloud Assistant before installing the Cloud Assistant Agent. For specific steps, see Install Cloud Assistant Agent.	None

For more information, see the Cloud Assistant overview.

API

Limitation item	Limitation	Quota increase method

Limitation item

Limitation

Quota increase method

API rate quota

The API rate quota refers to the constraint limit on the frequency of OpenAPI calls. Based on the API version and resource type, it is roughly divided into two categories:

ECS API rate quota: The rate limit for APIs such as images, security groups, and block storage with the API version 2014-05-26.
For specific operations to view the ECS API rate quota, see View ECS API rate quota.
Block Storage API rate quota: The rate limit for advanced feature APIs of block storage with the API version 2021-07-30.
For specific operations to view the block storage API rate quota, see View or increase block storage API rate quota.

ECS API rate quota: This type of API rate quota does not support quota increase applications.
Block Storage API rate quota: You can apply for a quota increase. For specific operations, see View or increase block storage API rate quota.

For more information on ECS APIs, see Integration Overview.

Table dimension description

Instances

VCPU quota item

GPU card and vGPU quota item

Images

Block storage

Snapshots

SSH key pairs

Public bandwidth

Elastic network interfaces

Prefix lists

Security groups

Reserved instances

Savings plans

Storage capacity unit packages

Launch templates

Deployment sets

Auto provisioning groups

Cloud Assistant

API

Sales Support

Technical Support

Connect & Report Abuse

Region name	Limitation
China (Beijing), China (Shanghai), China (Hangzhou), China (Shenzhen)	50 Gbps
Hong Kong (China), Singapore	20 Gbps
Others	10 Gbps

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