附录 D. LVM 对象标签

An LVM tag is a word that can be used to group LVM2 objects of the same type together. Tags can be attached to objects such as physical volumes, volume groups, and logical volumes. Tags can be attached to hosts in a cluster configuration.

可在命令行的 PV、VG 或者 LV 参数中赋予标签。标签应该有 @ 作为前缀以避免混淆。每个标签都可用所有对象都拥有的标签取代来扩大范围，标签的类型根据它在命令行的位置确定。

As of the Red Hat Enterprise Linux 6.1 release, LVM tags are strings of up to 1024 characters (for earlier releases the upper length limit was 128 characters). LVM tags cannot start with a hyphen.

A valid tag can consist of a limited range of characters only. For the Red Hat Enterprise Linux 6.0 release, the allowed characters are [A-Za-z0-9_+.-]. As of the Red Hat Enterprise Linux 6.1 release, the list of allowed characters has been extended, and tags can contain the "/", "=", "!", ":", "#", and "&" characters.

Only objects in a volume group can be tagged. Physical volumes lose their tags if they are removed from a volume group; this is because tags are stored as part of the volume group metadata and that is deleted when a physical volume is removed.

以下命令列出所有带 database 标签的逻辑卷。

lvs @database

lvs @database

The following command lists the currently active host tags.

lvm tags

lvm tags

vgchange --deltag T9 --deltag T10 --addtag T13 --addtag T14 grant

vgchange --deltag T9 --deltag T10 --addtag T13 --addtag T14 grant