A new partition table is erroneously created on an existing partition on a multipath device after every reboot on Red Hat Enterprise Linux 5

Solution Unverified - Updated -

Issue

  • Some mpath devices have a "fake" partition table at the beginning of partition1 that is causing vgscan to reject the device.

    • This is causing LVM to grab onto the underlying paths instead
  • Each time I reboot, the problem is on whatever disk gets mapped to dm-48 for the multipath. It is always dm-48. The UUID that it errors on keeps changing based on what disk uses that dm number.

Environment

  • Red Hat Enterprise Linux 5 (RHEL5)
    • Issue observed on RHEL5 update 9 (kernel-2.6.18-348.4.1.el5), but it is unknown if this is the only affected version at this time.
  • Device-mapper-multipath managing paths on devices.
  • LVM2 logical volume management.
  • Issue began after upgrading the system.

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