Why do I see 'Found duplicate PV' warnings when using LVM with multipath storage in RHEL?

Updated 2015-03-19T08:20:06+00:00

Issue

  • LVM commands (such as vgs, lvchange, etc) display messages like this when trying to list VG or LV:
Found duplicate PV GDjTZf7Y03GJHjteqOwrye2dcSCjdaUi: using /dev/dm-5 not /dev/sdd
Found duplicate PV GDjTZf7Y03GJHjteqOwrye2dcSCjdaUi: using /dev/emcpowerb not /dev/sde
Found duplicate PV GDjTZf7Y03GJHjteqOwrye2dcSCjdaUi: using /dev/sddlmab not /dev/sdf
  • Why do I get duplicate PV warnings when I run LVM commands?
  • How can I get rid of duplicate PV messages display by LVM commands?
  • I have scsi SAN Lun configured from storage, filesystem is configured over LVM which is created on top of multipath. Why do my physical volumes show as sd devices instead of mpath devices?

Environment

  • Red Hat Enterprise Linux (RHEL) 7
  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 4
  • lvm2
  • Multiple paths to storage device(s)

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