In short the solution is just to use vgremove for the actual /dev/mapper device:


vgremove /dev/mapper/backups-backuplv

box mnt # mdadm --manage /dev/md8 --stop
mdadm: Cannot get exclusive access to /dev/md8:Perhaps a running process, mounted filesystem or active volume group?
box mnt # lv
lvchange     lvconvert    lvcreate     lvdisplay    lvextend     lvm          lvmchange    lvmconf      lvmdiskscan  lvmdump      lvmsadc      lvmsar       lvreduce     lvremove     lvrename     lvresize     lvs          lvscan
box mnt # pvdisplay
  --- Physical volume ---
  PV Name               /dev/md8
  VG Name               backups
  PV Size               7.28 TiB / not usable 4.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              1907688
  Free PE               20251
  Allocated PE          1887437
  PV UUID               IDnmlM-2r3q-McwV-y2at-djxK-DvPM-sFqlTo
  
box mnt # pvchange --help
  pvchange: Change attributes of physical volume(s)

pvchange
    [-a|--all]
    [-A|--autobackup y|n]
    [-d|--debug]
    [-f|--force]
    [-h|--help]
    [-t|--test]
    [-u|--uuid]
    [-x|--allocatable y|n]
    [--metadataignore y|n]
    [-v|--verbose]
    [--addtag Tag]
    [--deltag Tag]
    [--version]
    [PhysicalVolumePath...]

box mnt # pvchange --help^C
box mnt # pvremove /dev/md8
  PV /dev/md8 belongs to Volume Group backups so please use vgreduce first.
  (If you are certain you need pvremove, then confirm by using --force twice.)
box mnt # vgdisplay
  --- Volume group ---
  VG Name               backups
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               7.28 TiB
  PE Size               4.00 MiB
  Total PE              1907688
  Alloc PE / Size       1887437 / 7.20 TiB
  Free  PE / Size       20251 / 79.11 GiB
  VG UUID               DwxSxL-UmcV-TyjM-TUa1-ef4w-lrK5-cipxiI
  
box mnt # vgremove /dev/^C
box mnt # ls /dev/m
mapper/  mcelog   md/      md0      md0p1    md1      md1p1    md2      md20     md2p1    md8      md99     mem      mpt2ctl 
box mnt # ls /dev/m
mapper/  mcelog   md/      md0      md0p1    md1      md1p1    md2      md20     md2p1    md8      md99     mem      mpt2ctl 
box mnt # ls /dev/mapper/
backups-backuplv  control          
box mnt # vgremove /dev/mapper/backups-backuplv
  Invalid volume group name: backups/backuplv
  Run `vgremove --help' for more information.
box mnt # vgremove /dev/mapper/backups
Do you really want to remove volume group "backups" containing 1 logical volumes? [y/n]: y
Do you really want to remove and DISCARD active logical volume backuplv? [y/n]: y
  Logical volume "backuplv" successfully removed
  Volume group "backups" successfully removed
box mnt #
 

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