[linux-lvm] When and why vgs command can change metadata and incur old metadata to be backed up?

[Eric Ren]

Hi all,

Sometimes, I see the following message in the VG metadata backups under 
/etc/lvm/archive:

"""
contents = "Text Format Volume Group"
version = 1

description = "Created *before* executing 'vgs'"
"""

I'm wondering when and why the new backups will be created by reporting 
command like vgs?

Thanks in advance!
Eric