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Document URL: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Logical_Volume_Manager_Administration/lvm_tags.html Section Number and Name: Appendix C. LVM Object Tags Describe the issue: "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. Snapshots cannot be tagged." Per https://www.redhat.com/archives/linux-lvm/2012-April/msg00032.html this works and is supported. Suggestions for improvement: Remove the last sentence from the mentioned paragraph.
The RHEL 5 version of this document on the Portal no longer says that tagging is not supported for snapshots. https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Logical_Volume_Manager_Administration/lvm_tags.html