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Description of problem:
device-mapper-multipath-0.4.9-53.el6.x86_64 are providing duplicated entries in "blacklist" section:
===
        device {
                vendor "IBM"
                product "Universal Xport"
        }
        device {
                vendor "IBM"
                product "Universal Xport"
        }
        device {
                vendor "IBM"
                product "S/390.*"
        }
        device {
                vendor "IBM"
                product "S/390.*"
        }
        device {
                vendor "DELL"
                product "Universal Xport"
        }
        device {
                vendor "DELL"
                product "Universal Xport"
        }
===

No side effect found.

Version-Release number of selected component (if applicable):
device-mapper-multipath-0.4.9-53.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Check the "blacklist" multipathd -k'show config'

  
Actual results:
Found duplicated blacklist entries.

Expected results:
No duplicated blacklist entries.

Additional info:
It's a regression, but no side effect found, hence requesting fix for RHEL 6.4 as https://bugzilla.redhat.com/show_bug.cgi?id=752989#c35

This is simply a cosmetic issue. There's no reason to fix it for 6.3.

This bug might be caused by bug #803527.

The patch of it contain duplicate blacklist entries.

Fixed.  Multipath now checks if the new entry is a duplicate before storing.

no duplicate blacklist entries in device-mapper-multipath-0.4.9-63.el6.x86_64.

VERIFY.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0458.html