How to migrate booting to/from local disk or SAN, between SANs, or between multipath methods?

Solution Verified - Updated -

Issue

  • System is booting from local disk. How to migrate the data to boot the system from SAN/multipath?
  • I have an existing RHEL installation which boots from SAN. I wish to migrate this system from one SAN to another SAN.
  • Existing SAN LUN to be decommissioned, and new SAN LUN desired to become boot device
  • How to migrate from Powerpath to Multipath in Boot from SAN environment?
  • Is there supported method of migrating from Powerpath to Multipath when the system is booting from emcpower devices.
  • How to migrate 'Boot from SAN' to 'Boot from Local Disk' ?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Boot to/from local disk
  • Boot to/from SAN
  • device-mapper-multipath or a third-party multipathing solution such as EMC Powerpath
  • Boot migration

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