Alibaba Cloud File Storage NAS provides a tag management feature that lets you classify and manage file systems based on various dimensions, such as business, purpose, and owner. This document describes the limits on tags and explains how to add, view, edit, and detach tags, and how to filter file systems by tag.
Limits
Limit on the number of tags
You can add a maximum of 20 tags to each file system.
Limit on tag keys
Each tag key must be unique for a file system.
Limit on regions
Tags are specific to the region in which they are created. For example, tags created in the China (Hangzhou) region are invisible in the China (Shanghai) region.
Add tags
Follow these steps to add tags to a file system.
Log on to the NAS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the resource group and region where your file system resides.
On the File System List page, add tags to one or more file systems.
Add tags to a single file system: In the Tags column for the target file system, hover over the
icon and click Edit in the tooltip that appears.
Add tags to multiple file systems: Select the check boxes for the desired file systems and click Add Tags in the lower-left corner of the page.
In the dialog box that appears, configure the tags.
Parameter
Description
Tag key
The tag key can be up to 128 characters in length.
The tag key cannot be empty. It cannot start with
aliyunoracs:. It cannot containhttp://orhttps://.Tag value
The tag value can be up to 128 characters in length.
The tag value cannot contain
http://orhttps://.Click OK.
View tags
If you have added tags to a file system, follow these steps to view them.
Log on to the NAS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the resource group and region where your file system resides.
On the File System List page, hover over the
icon in the Tags column for the target file system to view the tags in the tooltip that appears.
You can also view the tags in the Tags section on the Basic Information tab for the target file system.
Edit tags
Follow these steps to edit existing tags.
Log on to the NAS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the resource group and region where your file system resides.
On the File System List page, hover over the
icon in the Tags column for the target file system and click Edit in the tooltip that appears.In the Configure Tags dialog box, edit the tags and click OK.
You can also click the 
icon in the Tags section on the Basic Information tab to edit the tags.
Detach tags
Log on to the NAS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the resource group and region where your file system resides.
On the File System List page, detach tags from one or more file systems.
To detach a tag from a single file system: Hover over the
icon in the Tags column for the target file system and click Edit in the tooltip that appears. In the Configure Tags dialog box, click the 
icon next to the tag that you want to detach, and then click OK.Detach tags from multiple file systems: Select the check boxes for the desired file systems and click Delete Tags in the lower-left corner of the page. In the Delete Tags dialog box, select the tags that you want to detach and click Unbind Tags.
Filter file systems by tag
Follow these steps to filter file systems by a specific tag.
Log on to the NAS console.
In the left-side navigation pane, choose .
In the top navigation bar, select the resource group and region where your file system resides.
At the top of the File System List page, click Filter by Tag. Select or enter a tag key and a tag value. The list is updated to show only the file systems that match the filter.
