'lvs' command does not show all the lvm volumes

Issue

• The following lvm volumes are mounted on system, and users are able to access them without any issues. But the lvs command does not list the lvm volume /dev/vg2/lv2

  $ mount
  [...]
  /dev/vg1/lv1  /lv1 ext3 rw,data=ordered 0 0
  /dev/vg2/lv2  /lv1 ext3 rw,data=ordered 0 0
  

• There is no entry for /dev/vg2/lv2 in following lvs command output

  $ lvs -a -o+devices.
    LV          VG              Attr   LSize   Origin Snap%  Move Log Copy%  Convert Devices               
    lv1         vg1             -wi-ao  69.00G                                       /dev/mapper/mpath10(0)
    lv1         vg1             -wi-ao  69.00G                                       unknown device(0)     
    rootvol     rootvg          -wi-ao   4.00G                                       /dev/cciss/c0d0p2(0)  
    swapvol     rootvg          -wi-ao   8.00G                                       /dev/cciss/c0d0p2(584)
    tmpvol      rootvg          -wi-ao 512.00M                                       /dev/cciss/c0d0p2(256)
    varvol      rootvg          -wi-ao   4.00G                                       /dev/cciss/c0d0p2(128)