How to change I/O scheduler fo the specific device, not whole devices in RHEL 6 ?

Solution In Progress - Updated -

Issue

We want to change deadline I/O scheduler permanently for the specific device, not whole devices in RHEL 6. so found it at Red Hat's KCS article for whole devcies but not the specific devices.
How can we configure it as we purpose ?

Environment

Red Hat Enterprise Linux 6

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