LVM is using an underlying /dev/sd* SCSI device path as a physical volume instead of the /dev/emcpower* device it belongs to in RHEL

Solution Unverified - Updated -

Issue

  • EMC power devices for VG are getting replaced with respective OS native devices randomly whenever server reboots.
  • LVM picks up underlying SCSI paths as physical volumes instead of using the emcpower device
  • Logical volumes are getting mapped to a path instead of the PowerPath device
  • We had a path failure but I/O wasn't routed to the other path in the PowerPath device

Environment

  • Red Hat Enterprise Linux (RHEL) 4, 5, 6, and 7
  • LVM2
  • EMC PowerPath
  • One or more logical volumes are mapped to a path instead of to the emcpower device (see Diagnostic Steps to determine if this is true)

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