How to change the 'scheduler' of multipathd/mpath devices or `sd` devices using the udev rules?

Solution Verified - Updated -

Issue

  • How to change the 'scheduler' of multipathd/mpath devices or sd devices using the udev rules?
  • Is there a way to change the scheduler to specific /dev/mapper/mpath devices OR for all the sd devices for that particular mpath device.

Environment

  • Red Hat Enterprise Linux 6
  • DM Multipath
  • UDEV

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