Description of problem:
change the IBM 2810XIV device configuration in /etc/multipath.conf then reload the file. see the duplicated IBM 2810XIV device configuration using 'multipathd show config'.


Version-Release number of selected component (if applicable):
device-mapper-multipath-0.4.9-26.el7.x86_64

How reproducible:


Steps to Reproduce:
1. install device-mapper-multipath and execute 'mpathconf --enable'
2. edit the /etc/multipath.conf and add the following section. the rr_min_io_rp is changed to 10.
devices {
        device {
                vendor "IBM"
                product "2810XIV"
                path_grouping_policy multibus
                getuid_callout "/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/%n"
                path_selector "round-robin 0"
                path_checker tur
                features "1 queue_if_no_path"
                hardware_handler "0"
                prio const
                failback 15
                rr_weight uniform
                rr_min_io 15
                rr_min_io_rq 10
        }
}
3. multipathd reconfig
4. multipathd show config
>> the issue : see 2 IBM 2810XIV device conf >>>
5. multipath -v3 | grep rr_min_io_rq
>> the issue : see nothing about the rr_min_io_rp >>>
  
Actual results:
>>>> the default built-in one >>>>
see 2 IBM 2810XIV device conf:
        device {
                vendor "IBM"
                product "2810XIV"
                path_grouping_policy multibus
                getuid_callout "/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/%n"
                path_selector "round-robin 0"
                path_checker tur
                features "1 queue_if_no_path"
                hardware_handler "0"
                prio const
                failback 15
                rr_weight uniform
                rr_min_io 15
                rr_min_io_rq 1
        }
>>>> the user defined one >>>>
        device {
                vendor "IBM"
                product "2810XIV"
                path_grouping_policy multibus
                getuid_callout "/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/%n"
                path_selector "round-robin 0"
                path_checker tur
                features "1 queue_if_no_path"
                hardware_handler "0"
                prio const
                failback 15
                rr_weight uniform
                rr_min_io 15
                rr_min_io_rq 10
        }
>>>>
Expected results:


Additional info: