List existing LVM2 tags

Question

Adding tags to LVM volumes and showing volumes that possess that tag is easy and works like a charm; but somehow I can't find a way to list all tags in use, or to show tags that apply to a specific volume. lvdisplay -v doesn't give me details on tags, neither lvs seems to have any option for that. (I am using CentOS 5.4.)

Answer 1

Showing tags that belong to a specific volume:

# lvchange --addtag @RootFS /dev/VolGroup00/LogVol00
Logical volume "LogVol00" changed

# lvs -o lv_tags /dev/VolGroup00/LogVol00
  LV Tags
  RootFS

# lvs -o lv_tags /dev/VolGroup00/LogVol01
  LV Tags

You can easily script getting the active tags for a specific volume that way.

If you parse the output of the lvs command, and run the logical volumes through the command I used above, you'll be able to grep, sed and awk your way to a list of all tags in use.

Physical volumes and volume groups have commands that are similar to the above:

# pvs -o pv_tags /dev/sda2
  PV Tags

# vgs -o vg_tags /dev/VolGroup00
  VG Tags

Here's a Red Hat KB article about this