This topic provides the limits of Resource Management, including the limits on resource groups, resource directories, resource sharing, and tags.

Limits on resource directories

Item Upper limit Adjustable Remarks
Number of resource directories that you can create by using an Alibaba Cloud account 1 N/A The members of a resource directory cannot be used to create resource directories.
Number of Root folders in a resource directory 1 N/A None.
Number of folders in a resource directory 100 Apply for a quota. The Root folder is not included.
Number of folder levels 5 N/A The Root folder is not included.
Number of members in a resource directory 20 Apply for a quota. None.
Number of valid invitations per day 20 Apply for a quota. Accepted invitations are not included.
Duration of invitation expiration 14 days N/A None.
Number of verification codes that can be sent per day when you bind a mobile phone number to a member for security purposes 100 N/A None.

Limits on resource sharing

Limits on resource groups

Item Upper limit Adjustable
Number of resource groups 30 Apply for a quota.
Number of characters in the ID of a resource group 50 N/A
Number of characters in the name of a resource group 50 N/A

Limits on tags

Item Limit
Maximum number of tags that can be added to a single resource 20
Whether tag information can be shared across regions

No. For example, in the China (Shanghai) region, you cannot view tags created in the China (Hangzhou) region.

Tag key A tag key must be 1 to 128 characters in length and cannot contain http:// or https://. It cannot start with aliyun or acs:.
Tag value A tag value must be 1 to 128 characters in length and cannot contain http:// or https://. It cannot start with aliyun or acs:.
Adding tags to resources

Each tag key on a resource can have only one tag value. If you create a tag that has the same key as an existing tag, the value of the existing tag is overwritten.

For example, the city:shanghai tag is added to a resource. If you add the city:newyork tag to the resource, the city:shanghai tag is automatically removed from the resource.

Maximum number of preset tags that can be created within a single Alibaba Cloud account 1,000
Maximum number of tag values that can be specified for a single preset tag key 1,000