title: Duplicate of PV dev /dev/mapper/mpathc exists on unknown device 8:96
body: <p>I have configured multipath in RHEL linux. i have changed the filter to "<code>filter = [ "a|/dev/disk/by-id/dm-uuid-.*mpath-.*|", "r|.*|"]</code>". After that while issue a command <code>vgscan</code>if diplays a followin error </p>
  
  <pre><code>Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:96
    Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:16
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:80
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:0
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:80
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:0
    Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:96
    Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:16
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:80
    Duplicate of PV OLugXq-iONS-X2Zm-JScR-0Khq-SekX-N2IhQl dev /dev/mapper/mpathb exists on unknown device 8:0
    Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:96
    Duplicate of PV TNaeXs-74GB-U2hq-DR8Z-nlJO-UQdQ-rg7hW7 dev /dev/mapper/mpathc exists on unknown device 8:16
    PV /dev/mapper/mpathb    VG lvol0   lvm2 [799.98 GiB / 49.98 GiB free]
    PV /dev/mapper/mpatha1   VG rhel    lvm2 [99.97 GiB / 0    free]
    PV /dev/mapper/mpathc    VG lvol1   lvm2 [49.98 GiB / 1008.00 MiB free]
    Total: 3 [949.94 GiB] / in use: 3 [949.94 GiB] / in no VG: 0 [0   ]
  </code></pre>
  
  <p>i have tried lot in modifying lvm filters. 
  Could anyone help me on this.
  Thanks in Advance :)</p>