What is the meaning of multipathd messages such as "add map", "remove map", "devmap not registered" in RHEL?

Solution Verified - Updated -

Issue

  • I would like to better understand mulitpathd messages seen in the /var/log/messages.
  • Should I be concerned about messages from multipathd such as the following:
    Sep  1 07:41:13 rhel5 multipathd: dm-22: remove map (uevent)
Sep  1 07:41:13 rhel5 multipathd: dm-22: remove map (uevent)
Sep  1 07:41:13 rhel5 multipathd: dm-22: devmap not registered, can't remove
Sep  1 07:41:13 rhel5 multipathd: dm-21: remove map (uevent)
Sep  1 07:41:13 rhel5 multipathd: dm-21: devmap not registered, can't remove
Sep  1 07:41:13 rhel5 multipathd: dm-20: remove map (uevent)
Sep  1 07:41:13 rhel5 multipathd: dm-20: devmap not registered, can't remove
Sep  1 07:41:13 rhel5 multipathd: dm-5: remove map (uevent)
Sep  1 07:41:13 rhel5 multipathd: mpath3: stop event checker thread
Sep  1 07:41:13 rhel5 multipathd: mpath3: event checker exit
Sep  1 07:42:38 rhel5 multipathd: dm-5: add map (uevent)
Sep  1 07:42:38 rhel5 multipathd: mpath3: event checker started
Sep  1 07:42:39 rhel5 multipathd: dm-20: add map (uevent)
Sep  1 07:42:39 rhel5 multipathd: dm-21: add map (uevent)
Sep  1 07:42:39 rhel5 multipathd: dm-22: add map (uevent)

Environment

  • Red Hat Enterprise Linux (RHEL) 5 and 6
  • device-mapper-multipath

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