Migrating to DMP from EMC PowerPath

Description

Migrating to DMP from EMC PowerPath

See Migrating LVM volume groups to DMP

This procedure describes removing devices from EMC PowerPath control and enabling DMP on the devices.

Plan for system downtime for the following procedure.

The migration steps involve system downtime on a host due to the following:

  • Need to stop applications

  • Need to stop the VCS services if using VCS

To remove devices from EMC PowerPath control and enable DMP

  1. Turn on the DMP support for the LVM volume group.

    # vxdmpadm settune dmp_native_support=on
  2. Stop the applications that use the PowerPath meta-devices.

    In a VCS environment, stop the VCS service group of the application, which will stop the application.

  3. Unmount any file systems that use the volume group on the PowerPath device.

  4. Stop the LVM volume groups that use the PowerPath device.

    # varyoffvg vgroupname
  5. If the root volume group (rootvg) is under PowerPath control, migrate the rootvg to DMP.

    See Migrating a SAN root disk from EMC PowerPath to DMP control.

  6. Remove the disk access names for the PowerPath devices from VxVM.

    # vxdisk rm emcpowerXXXX

    Where emcpowerXXXX is the name of the device.

  7. Take the device out of PowerPath control:

    # powermt unmanage dev=pp_device_name
    or
    # powermt unmanage class=array_class
  8. Verify that the PowerPath device has been removed from PowerPath control.

    # powermt display dev=all
  9. Run a device scan to bring the devices under DMP control:

    # vxdisk scandisks
  10. Mount the file systems.

  11. Restart the applications.

Terms of use for this information are found in Legal Notices.

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