Limits and quotas on ECS resources - Elastic Compute Service

Elastic Compute Service (ECS) may have limits on features, performance metrics, and related quotas. Some limits can be raised by increasing quotas. To ensure that available ECS resources meet your business requirements, we recommend that you learn about the limits, plan for resources, and apply for quota increases or mitigate the impacts of the limits that cannot be raised in advance. This topic describes the limits on ECS resources and how to increase specific quotas.

Table dimensions

You can view the table in each section of this topic to learn about the limits on the corresponding features, performance metrics, and quotas. The following section describes the dimensions in the tables:

Item: a feature, performance metric, or quota.
Note
A quota refers to the maximum number of resources or operations allowed for an Alibaba Cloud account.
Limit: the limits on an item.
If an item is an ECS quota, you can query the quota by quota ID to obtain the limit of the quota.
Method to raise limits: the methods available to raise the limits on an item.
If you cannot raise the limits on an item, you must mitigate the impacts of the limits in advance. If you can raise the limits, use a suitable method to apply for a quota increase as needed.

Instances

Item	Limit	Method to raise limits
vCPU-based quotas	The maximum number of vCPUs on all ECS instances that belong to a specific instance family and use a specific billing method such as subscription, pay-as-you-go, or Preemptible Instance within an Alibaba Cloud account per region. For information about the limits, see the vCPU-based quotas section of this topic.	View or increase the quotas of ECS instance types
GPU- and vGPU-based quotas	The maximum number of GPUs or vGPU-accelerated instances among all ECS instances that belong to a specific instance family and use a specific billing method such as subscription, pay-as-you-go, or Preemptible Instance within an Alibaba Cloud account per region. For information about the limits, see the GPU- and vGPU-based quotas section of this topic.	View or increase the quotas of ECS instance types
The maximum number of subscription instances that an Alibaba Cloud account can purchase per time in a specific region	You can view the quota based on the quota ID `q_prepaid-instance-count-per-once-purchase`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	N/A
Change the billing method of instances from pay-as-you-go to subscription	No limit on the number of resources or operations. You cannot change the billing method from pay-as-you-go to subscription for instances of retired instance types. For more information, see Change the billing method from pay-as-you-go to subscription.	N/A
Change the billing method of instances from subscription to pay-as-you-go	A refund generated from the billing method change is counted against the monthly refund quota. If the refund quota for the current month is exhausted, you cannot request new refunds within the month. In this case, you cannot change the billing method of instances from subscription to pay-as-you-go. For more information, see Change the billing method from subscription to pay-as-you-go. Note The refundable amount is displayed on the page on which you change the billing method of instances. The refunded amount is automatically set to 0 on the first day of the next month.	N/A
Secondary virtualization	Only ECS Bare Metal Instance families and Super Computing Cluster (SCC) instance families support secondary virtualization. Other ECS instance families do not support virtualization software installation or secondary virtualization.	N/A
Sound card applications	ECS does not support sound card applications.	N/A
External hardware devices	You cannot directly attach external hardware devices, such as hardware dongles, USB flash drives, external hard disks, and bank U keys, to ECS instances. However, you can use software verification methods, such as software dongles and two-factor authentication based on one-time passwords.	N/A
Multicast protocols	ECS does not support multicast protocols. Use unicast protocols instead.	N/A
Internet Content Provider (ICP) filing for websites and applications	If you want to apply for an ICP filing for a website or an application, you must purchase an ECS instance with a subscription duration of at least three months. You can apply for ICP filings for up to five websites or applications for each ECS instance. For more information, see Check the instance for ICP filing.	N/A
Licenses	Specific software or application licenses must be bound to the hardware of ECS instances. After you migrate an ECS instance, its hardware information may change. As a result, the licenses bound to the original hardware become invalid.	N/A

vCPU-based quotas

Note

When you view a quota, the number corresponding to the quota indicates the maximum number of vCPUs allowed for your Alibaba Cloud account in the current region, not the maximum number in all regions.

GPU- and vGPU-based quotas

Note

When you view a quota, the number corresponding to the quota indicates the maximum number of GPUs or vGPU-accelerated instances allowed for your Alibaba Cloud account in the current region, not the maximum number in all regions.

Images

Item	Limit	Method to raise limits
The maximum number of custom images that an Alibaba Cloud account can retain per region	You can view the quota based on the quota ID `q_user-image-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
The maximum number of accounts with which you can share a custom image	You can view the quota based on the quota ID `q_user-per-image-shared-user-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
Images supported by instance types	Instance types with 4 GiB of memory or more do not support 32-bit images.	N/A

For more information about images, see Overview.

Block storage devices

Item	Limit	Method to raise limits
System disks per instance	1	N/A
The maximum number of data disks per instance	The maximum number of data disks that you can attach to an ECS instance varies based on the instance type. For more information, see Overview of instance families. Note You can attach only one system disk and up to 16 data disks to an instance when you create the instance. If the instance requires additional data disks, attach more data disks after the instance is created. You can call the DescribeInstanceTypes operation to query the maximum number of disks allowed for an instance of a specific instance type.	N/A
The cloud disk capacity quota for an Alibaba Cloud account in a specific region and zone	The cloud disk capacity quota varies based on the disk category. For information about how to view the capacity quotas, see the View or increase the general quotas of EBS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of EBS resources
The capacity of a basic disk	5 GiB to 2,000 GiB	N/A
The capacity of a standard SSD	20 GiB to 32,768 GiB	N/A
The capacity of an ultra disk	20 GiB to 32,768 GiB	N/A
The capacity of an Enterprise SSD (ESSD)	PL0 ESSD: 1 GiB to 65,536 GiB PL1 ESSD: 20 GiB to 65,536 GiB PL2 ESSD: 461 GiB to 65,536 GiB PL3 ESSD: 1,261 GiB to 65,536 GiB	N/A
The capacity of an ESSD AutoPL disk	1 GiB to 65,536 GiB	N/A
The capacity of an ESSD Entry disk	10 GiB to 32,768 GiB	N/A
The capacity of a Regional ESSD	1 GiB to 65,536 GiB	N/A
The capacity of a local SSD	5 GiB to 800 GiB	N/A
The capacity of all local SSDs per instance	1,024 GiB	N/A
The capacity of an elastic ephemeral disk	64 GiB to 8,192 GiB	N/A
The capacity of a system disk	Windows Server: 40 GiB to 2,048 GiB FreeBSD: 30 GiB to 2,048 GiB Linux distributions excluding FreeBSD: 20 GiB to 2,048 GiB Note Basic disks are the previous generation of disks that are unavailable for purchase. If you use basic disks as system disks, the capacity of each basic disk is up to 500 GiB.	N/A
Permissions to attach new local disks to instances equipped with local disks	You cannot attach new local disks to instances already equipped with local disks.	N/A
Permissions to change the configurations of instances equipped with local disks	You can change only the bandwidth configurations of instances equipped with local disks.	N/A
The mount point of the system disk on a Linux instance	`/dev/vda`	N/A
The mount points of the data disks on a Linux instance	The mount points are named based on the number of data disks: From the 1st data disk up to the 25th data disk: `/dev/xvd[b-z]`. The 26th data disk and succeeding data disks: `/dev/xvd[aa-zz]`. For example, the 26th data disk is named `/dev/xvdaa`, the 27th data disk is named `/dev/xvdab`, and so on.	N/A

Note

The capacity of block storage devices is measured in binary units. The multiple of two neighboring binary units is 1,024. For example, 1 GiB equals 1,024 MiB.

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

Snapshots

Item	Limit	Method to raise limits
The maximum number of manual snapshots that can be retained per cloud disk	256	N/A
The maximum number of automatic snapshots that can be retained per cloud disk	1,000	N/A
The maximum number of automatic snapshot policies that can be retained in an Alibaba Cloud account per region	100	N/A
The number of automatic snapshot policies that you can associate with a cloud disk	1	N/A
The number of snapshots that can be concurrently created per cloud disk	1	N/A
The categories of block storage devices that support snapshots	You cannot create snapshots for local disks or elastic ephemeral disks. Only ESSD series disks (ESSDs, ESSD AutoPL disks, and ESSD Entry disks) for which the multi-attach feature is disabled support the snapshot-consistent group feature. Only ESSD series disks (ESSDs, ESSD AutoPL disks, ESSD Entry disks, and Regional ESSDs) support the instant access feature. For more information, see Use the instant access feature.	N/A
Download or export of snapshots	You cannot download or export created snapshots. You can create custom images from snapshots and export the custom images to your on-premises device.	N/A
Limits on manual and automatic snapshot creation	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.	N/A

For more information about snapshots, see Overview.

SSH key pairs

Item	Limit	Method to raise limits
The maximum number of SSH key pairs that an Alibaba Cloud account can retain per region	500	N/A
Images that support SSH key pairs	Only Linux images.	N/A

For more information about SSH key pairs, see Manage SSH key pairs.

Public bandwidth

This section describes the total maximum bandwidth of all pay-as-you-go and preemptible instances that use the pay-by-bandwidth billing method for network usage within an Alibaba Cloud account per region.
Note
You can view and increase the quota based on the quota ID q_internet-bandwidth-pay-by-bandwidth-of-postpaid-instance. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.
Region
Limit
China (Beijing), China (Shanghai), China (Hangzhou), and China (Shenzhen)
50 Gbit/s
China (Hong Kong) and Singapore
20 Gbit/s
Others
10 Gbit/s

As of November 27, 2020, the available maximum bandwidth when you create ECS instances or change their configurations is subject to the throttling policy of your account.
Note
To increase the maximum bandwidth, submit a ticket.
- In each region, the total maximum bandwidth of all ECS instances that use the pay-by-traffic billing method for network usage within an Alibaba Cloud account cannot exceed 5 Gbit/s.
- In each region, the total maximum bandwidth of all ECS instances that use the pay-by-bandwidth billing method for network usage within an Alibaba Cloud account cannot exceed 50 Gbit/s.

Limits on the maximum bandwidth per instance and changes to the public IP address of an instance:

Important

If you use the pay-by-traffic billing method for network usage, the maximum inbound and outbound bandwidths are used as the upper limits instead of guaranteed performance specifications. In scenarios in which demand exceeds resource supplies, the maximum bandwidths may not be reached. If you want guaranteed bandwidths for your ECS instances, use the pay-by-bandwidth billing method for network usage.

Item	Limit	Method to raise limits
The maximum inbound bandwidth per instance	If the purchased maximum outbound bandwidth is less than or equal to 10 Mbit/s, Alibaba Cloud allocates an inbound bandwidth of 10 Mbit/s. If the purchased maximum outbound bandwidth is greater than 10 Mbit/s, Alibaba Cloud allocates an inbound bandwidth that is equal to the purchased maximum outbound bandwidth.	N/A
The maximum outbound bandwidth per instance	Pay-by-traffic: Subscription instance: 200 Mbit/s Pay-as-you-go instance: 100 Mbit/s Pay-by-bandwidth: 200 Mbit/s	N/A
Changes to the assigned public IP address of an instance	The public IP address of an instance can be changed within 6 hours after the instance is created and can be changed up to three times.	N/A

The maximum public bandwidth of an ECS instance is limited to the network baseline bandwidth of the instance type. For more information, see Overview of instance families.

For more information about public bandwidth, see the Public bandwidth section of the "Network bandwidth" topic.

ENIs

Item	Limit	Method to raise limits
The maximum number of secondary elastic network interfaces (ENIs) that can be created for an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_elastic-network-interfaces`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
Virtual private cloud (VPC) and zone	An ECS instance and the ENIs bound to the instance must reside in the same VPC and zone. The ENIs bound to an ECS instance can connect to different vSwitches in the same VPC and zone as the instance. If you bind two or more ENIs from the same subnet to an ECS instance, network issues such as asymmetric routing may occur. You can assign one or more secondary private IP addresses to each primary or secondary ENI to optimize the usage of ECS instances deployed in VPCs and divert traffic during a failover. For more information, see Secondary private IP addresses.	N/A
The maximum number of ENIs per instance	The number of ENIs you can bind to an ECS instance varies based on the instance type. For more information, see the ENIs columns in Overview of instance families.	N/A

For more information about ENIs, see Overview.

Prefix lists

Item	Limit	Method to raise limits
The maximum number of prefix lists allowed for an Alibaba Cloud account per region	100	N/A
The maximum number of entries in a prefix list	200	N/A
The maximum number of resources that can be associated with a prefix list	1,000	N/A

For more information about prefix lists, see Overview.

Port lists

Item	Limit	Method to raise limits
The maximum number of port lists allowed for an Alibaba Cloud account per region	1,000	N/A
The maximum number of entries in a port list	2,000	N/A
The maximum number of resources that can be associated with a port list	1,000	N/A

For more information about port lists, see Overview.

Security groups

Item	Limit on basic security groups	Limit on advanced security groups
The maximum number of security groups allowed for an Alibaba Cloud account per region	You can view the quota or apply for a quota increase based on the quota ID `q_security-groups`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	The limit is the same as the limit on basic security groups.
The maximum number of ECS instances of the classic network type that a security group of the classic network type 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.	Advanced security groups do not support the classic network.
The maximum number of ECS instances of the VPC type that a security group of the VPC type can contain	This limit varies based on the number of private IP addresses that the security group can contain.	No limit.
The maximum number of security groups that can be associated with an ECS instance	10	The limit is the same as the limit on basic security groups.
The maximum number of security groups that can be associated with an ENI bound to an ECS instance	10
The maximum number of inbound and outbound rules in all security groups associated with an ENI	1,000	The limit is the same as the limit on basic security groups.
The maximum number of rules that reference security groups as authorization objects (sources or destinations) in a security group	20	0. You cannot add rules that reference security groups as authorization objects (sources or destinations) to an advanced security group or reference advanced security groups as authorization objects (sources or destinations) in security group rules.
The maximum number of private IP addresses that a security group of the VPC type can contain within an Alibaba Cloud account per region	6,000 Note You can view the maximum number of private IP addresses that a basic security group of the VPC type can contain based on the quota ID `q_vpc-normal-security-group-ip-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic. If more than 6,000 private IP addresses assigned to ECS instances require mutual access over the internal network, you can add the instances to multiple security groups and allow mutual access between the instances.	65,536
Internet access port	For security reasons, port 25 is disabled on ECS instances by default. We recommend that you use the SSL port to send emails. In most cases, the SSL port is port 465.	The limit is the same as the limit on basic security groups.

For more information about security groups, see Overview.

Reserved instances

Item	Limit	Method to raise limits
The total number of regional reserved instances allowed for an Alibaba Cloud account in all regions	20	Submit a ticket
The maximum number of zonal reserved instances allowed for an Alibaba Cloud account per zone	20	Submit a ticket
Instance type	The gn6i and t5 instance families do not support regional reserved instances. You cannot split or merge gn6i or t5 reserved instances. Note The instance types that you can select when you purchase a reserved instance are displayed on the buy page.	N/A
Eligible resources	Reserved instances can match only pay-as-you-go instances, excluding preemptible instances. Only the fees for computing resources, such as vCPUs and memory, can be offset. The fees for other resources, such as network and storage resources, cannot be offset. For information about the billing of ECS instances, see Billing overview. Windows reserved instances can be applied to offset the fees for the images of pay-as-you-go Windows instances. Note Windows reserved instances already include Windows images at no additional cost.	N/A

For more information about reserved instances, see What is a reserved instance?

Savings plans

Item	Limit	Method to raise limits
The maximum number of savings plans that you can purchase by using an Alibaba Cloud account	200	N/A
Eligible resources	Savings plans can be applied only to pay-as-you-go ECS instances and elastic container instances, excluding preemptible instances. For more information, see Eligible resources and deduction rules of savings plans. For ECS instances, savings plans can be used to offset the fees for computing resources (vCPUs and memory), images, system disks, and public bandwidth of static public IP addresses. Savings plans can also be used to offset capacity fees, performance provision fees, and performance burst fees for data disks attached to the ECS instances. For information about the billing of ECS instances, see Billing overview. For elastic container instances, savings plans can be used to offset only the fees for computing resources (vCPUs and memory). For information about the billing of elastic container instances, see Billing of elastic container instances.	N/A

For more information about savings plans, see What is a savings plan?

SCUs

Item	Limit	Method to raise limits
The maximum capacity that you can purchase for a storage capacity unit (SCU)	50 TiB	Submit a ticket
The maximum number of SCUs that you can purchase per region	100	N/A
Resource types that support SCUs	ESSDs, standard SSDs, ultra disks, and basic disks. Capacity NAS file systems and Performance NAS file systems. Standard snapshots. Object Storage Service (OSS) Standard, Infrequent Access (IA), and Archive storage classes. The backup storage capacity of Cloud Backup. Drive and Photo Service (PDS).	N/A
Eligible resources	SCUs can be used to offset only the fees for pay-as-you-go resources, but not for pay-as-you-go disks attached to preemptible instances.	N/A
Effective time	You can configure an effective time for each SCU. The effective time can be up to six months from the creation time of the SCU.	N/A
Creation and management of SCUs by calling API operations	Not supported.	N/A

For more information, see SCUs.

Launch templates

Item	Limit	Method to raise limits
The maximum number of launch templates allowed for an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_launch-template-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
The maximum number of versions in a launch template allowed for an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_launch-template-version-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
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 the parameters when you use the template to create ECS instances.	N/A
Launch template modification	After you create a launch template, you cannot modify the template. You can create a new version of the launch template and modify the parameters of the new version. For more information, see Manage launch template versions.	N/A

For more information about launch templates, see Overview.

Deployment sets

Item	Limit	Method to raise limits
The maximum number of deployment sets allowed for an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_deployment-set-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
The maximum number of ECS instances per deployment set	The maximum number of ECS instances in a deployment set varies based on the deployment strategy. For more information, see the Deployment strategies section of the "Deployment set" topic.	N/A
Dedicated host creation in deployment sets	Dedicated hosts cannot be created in deployment sets.	N/A
Region and zone	ECS instances and the deployment set to which the instances belong must reside in the same region. ECS instances in a deployment set that uses the low latency strategy must be deployed in the same zone.	N/A
Instance types and families supported by a deployment set	The instance types and families supported by a deployment set vary based on the deployment strategy. You can call the DescribeDeploymentSetSupportedInstanceTypeFamily operation to query the instance types and families supported by each deployment strategy.	N/A
Deployment set merging	Deployment sets cannot be merged.	N/A

For more information, see Deployment set.

Auto provisioning groups

Item	Limit	Method to raise limits
Cross-region instance provisioning	Auto provisioning groups cannot provision instances across regions.	N/A
The maximum number of configuration sources that you can specify for an auto provisioning group	For each auto provisioning group, you can specify only one version of a launch template as the basic configuration of instances. However, you can specify multiple resource pools to extend the available instance types.	N/A
The maximum number of resource pools that you can specify for an auto provisioning group	An auto provisioning group supports up to 20 resource pools, each consisting of a zone and multiple instance types.	N/A
The maximum number of ECS instances that can be created by an auto provisioning group	1,000	N/A

For more information about auto provisioning groups, see Overview.

Cloud Assistant

Item	Limit	Method to raise limits
The maximum number of Cloud Assistant commands within an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_axt-command-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
The maximum size of the output for a Cloud Assistant command task within an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_axt-task-output-size`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	N/A
The retention period of the output for a Cloud Assistant command task within an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_axt-task-output-life`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	N/A
The maximum number of registration codes for Cloud Assistant managed instances within an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_cloud-assistant-activation-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	N/A
The maximum number of ECS instances on which you can concurrently run a Cloud Assistant command within an Alibaba Cloud account per region	You can view the quota based on the quota ID `q_task-instance-count`. For more information, see the View or increase the general quotas of ECS resources section of the "Manage ECS quotas" topic.	View or increase the general quotas of ECS resources
The size limits on files that consist of batch, PowerShell, or shell scripts with custom parameters after the files are Base64 encoded	If a command is created but not run, the command file cannot exceed 18 KB in size after Base64 encoding. If a command is created and run by using the immediate execution feature and is saved, the command file cannot exceed 18 KB in size after Base64 encoding. If a command is created and run by using the immediate execution feature but is not saved, the command file cannot exceed 24 KB in size after Base64 encoding. A file that you want to upload cannot exceed 32 KB in size after Base64 encoding.	N/A
The maximum number of custom parameters in a command	20	N/A
Operating system	You can run Cloud Assistant commands only on instances that use the following operating systems: Alibaba Cloud Linux CentOS 6, CentOS 7, and CentOS 8 and later CoreOS Debian 8, Debian 9, and Debian 10 and later openSUSE Red Hat 5, Red Hat 6, and Red Hat 7 and later Note For Red Hat instances, you must download the Red Hat Package Manager (RPM) package to install Cloud Assistant Agent. For more information, see Install Cloud Assistant Agent. SUSE Linux Enterprise Server (SLES) 11, SLES 12, and SLES 15 and later Ubuntu 12, Ubuntu 14, Ubuntu 16, and Ubuntu 18 and later FreeBSD 11, FreeBSD 12, FreeBSD 13, and FreeBSD 14 and later Windows Server 2012, Windows Server 2016, and Windows Server 2019 and later Note By default, Cloud Assistant Agent is installed on ECS instances that are created from public images. For ECS instances created from custom images or Alibaba Cloud Marketplace images, you must check whether the operating systems support Cloud Assistant before you install Cloud Assistant Agent. For more information, see Install Cloud Assistant Agent.	N/A

For more information about Cloud Assistant, see Overview.

API operations

Item

Limit

Method to raise limits

Rates of ECS API operations

API rate quotas limit the rates at which you can call API operations. The quotas are classified into the following categories based on the API version and resource type:

ECS API rate quotas: limit the rates at which you can call API operations of version 2014-05-26 for ECS resources, such as images, security groups, and block storage devices.
For more information, see View the ECS API rate quotas.
Elastic Block Storage (EBS) API rate quotas: limit the rates at which you can call API operations of version 2021-07-30 for advanced block storage features.
For more information, see View or increase the API rate quotas of block storage devices.

ECS API rate quotas: You cannot apply for a quota increase.
EBS API rate quotas: You can apply for a quota increase. For more information, see View or increase the API rate quotas of block storage devices.

For more information about ECS API operations, see Integration overview.

Quota ID	Description	Instance family and references	Quota	Method to raise limits
q_ecs_restrict_prepay_c	The maximum number of vCPUs for subscription instances available for limited purchase	xn4, n4, mn4, and e4, previous-generation shared instance families Retired instance types	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_local_storage_prepay_c	The maximum number of vCPUs for subscription instances of instance families with local SSDs, including d and i series	Big data instance families (d series) Instance families with local SSDs (i series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_share_prepay_c	The maximum number of vCPUs for subscription instances of shared entry-level instance families, including e and t series	e, economy instance family t6, burstable instance family t5, burstable instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_ebm_prepay_c	The maximum number of vCPUs for subscription instances of ECS Bare Metal Instance families	Overview (excluding GPU-accelerated compute-optimized ECS Bare Metal Instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_hpc_prepay_c	The maximum number of vCPUs for subscription instances of High Performance Computing (HPC) instance families, including SCC	Overview (excluding GPU-accelerated compute-optimized SCC instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_high_mem_prepay_c	The maximum number of vCPUs for subscription instances of memory-optimized instance families, including re and se series	re7p, high-memory instance family re6p, persistent memory-optimized instance family re6p, persistent memory-optimized instance family re4, high-memory instance family re4e, high-memory instance family se1ne, network-enhanced memory-optimized instance family se1, memory-optimized instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_enterprise_prepay_c	The maximum number of vCPUs for subscription instances of enterprise-level instance families, including g, c, r, u, hf, and sn series	General-purpose instance families (g series) Compute-optimized instance families (c series) Enhanced instance families (excluding re6p, re6, and re4 instance families) Memory-optimized instance families (r series) (excluding se1ne and se1 instance families) Universal instance families Instance families with high clock speeds (hf series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_restrict_postpay_c	The maximum number of vCPUs for pay-as-you-go instances available for limited purchase	xn4, n4, mn4, and e4, previous-generation shared instance families Retired instance types	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_local_storage_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of instance families with local SSDs, including d and i series	Big data instance families (d series) Instance families with local SSDs (i series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_share_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of shared entry-level instance families, including e and t series	e, economy instance family t6, burstable instance family t5, burstable instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_ebm_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of ECS Bare Metal Instance families	Overview (excluding GPU-accelerated compute-optimized ECS Bare Metal Instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_hpc_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of HPC instance families, including SCC	Overview (excluding GPU-accelerated compute-optimized SCC instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_high_mem_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of memory-optimized instance families, including re and se series	re7p, high-memory instance family re6p, persistent memory-optimized instance family re6p, persistent memory-optimized instance family re4, high-memory instance family re4e, high-memory instance family se1ne, network-enhanced memory-optimized instance family se1, memory-optimized instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_enterprise_postpay_c	The maximum number of vCPUs for pay-as-you-go instances of enterprise-level instance families, including g, c, r, u, hf, and sn series	General-purpose instance families (g series) Compute-optimized instance families (c series) Enhanced instance families (excluding re6p, re6, and re4 instance families) Memory-optimized instance families (r series) (excluding se1ne and se1 instance families) Universal instance families Instance families with high clock speeds (hf series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_restrict_spot_c	The maximum number of vCPUs for preemptible instances available for limited purchase	xn4, n4, mn4, and e4, previous-generation shared instance families Retired instance types	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_local_storage_spot_c	The maximum number of vCPUs for preemptible instances of instance families with local SSDs, including d and i series	Big data instance families (d series) Instance families with local SSDs (i series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_share_spot_c	The maximum number of vCPUs for preemptible instances of shared entry-level instance families, including e and t series	e, economy instance family t6, burstable instance family t5, burstable instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_ebm_spot_c	The maximum number of vCPUs for preemptible instances of ECS Bare Metal Instance families	Overview (excluding GPU-accelerated compute-optimized ECS Bare Metal Instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_hpc_spot_c	The maximum number of vCPUs for preemptible instances of HPC instance families, including SCC	Overview (excluding GPU-accelerated compute-optimized SCC instance families)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_high_mem_spot_c	The maximum number of vCPUs for preemptible instances of memory-optimized instance families, including re and se series	re7p, high-memory instance family re6p, persistent memory-optimized instance family re6p, persistent memory-optimized instance family re4, high-memory instance family re4e, high-memory instance family se1ne, network-enhanced memory-optimized instance family se1, memory-optimized instance family	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types
q_ecs_enterprise_spot_c	The maximum number of vCPUs for preemptible instances of enterprise-level instance families, including g, c, r, u, hf, and sn series	General-purpose instance families (g series) Compute-optimized instance families (c series) Enhanced instance families (excluding re6p, re6, and re4 instance families) Memory-optimized instance families (r series) (excluding se1ne and se1 instance families) Universal instance families Instance families with high clock speeds (hf series)	View the quota based on the quota ID. For more information, see the View or increase the quotas of ECS instance types section of the "Manage ECS quotas" topic.	View or increase the quotas of ECS instance types

Region	Limit
China (Beijing), China (Shanghai), China (Hangzhou), and China (Shenzhen)	50 Gbit/s
China (Hong Kong) and Singapore	20 Gbit/s
Others	10 Gbit/s