How do I setup multipath on a system that already has LVM configured?

Solution Verified - Updated -

Issue

  • Is it possible to setup device mapper multipath easily on a system that already has LVM installed?
  • Does configuring DM multipath after LVM has been configured, require copying data?
  • Does the sequence of installing and configuring LVM and multipath matter?
  • How to configure existing lvm volume group to use DM-Multipath ?
  • SAN paths are successfully discovered at the OS/SCSI layer, but multipathd fails to bind them or create maps under /dev/mapper/

  • device-mapper returns an EBUSY error during a multipath reload:

    [655255.856253] device-mapper: table: 253:14: multipath: error getting device (-EBUSY)
[655255.856261] device-mapper: ioctl: error adding target to table

Environment

  • Red Hat Enterprise Linux 4, 5, 6, 7, 8, 9
  • DM-Multipath

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