for the errors 

Error: Package: sg3_utils-1.28-10.el6_7.x86_64 (External-RH-Gluster-3-Server-Repository-1)
Error: Package: device-mapper-multipath-0.4.9-87.el6.x86_64 (External-RH-Gluster-3-Server-Repository-1)

I don't see a direct Requires: listed in the SPEC file. Looks like these packages get pulled in indirectly and so there's no way to change the way the version dependency for these packages is specified via the redhat-storage-server SPEC file.

We need to observe how things turn up after a rebuild for RHEL 6.8 and a subsequent RPM install.

Observed a similar issue while installing glusterfs-ganesha on RHEL 6.8 platform

While doing yum install glusterfs-ganesha, observed below dependency issue:

Error:  Multilib version problems found. This often means that the root
       cause is something else and multilib version checking is just
       pointing out that there is a problem. Eg.:
       
         1. You have an upgrade for sg3_utils-libs which is missing some
            dependency that another package requires. Yum is trying to
            solve this by installing an older version of sg3_utils-libs of the
            different architecture. If you exclude the bad architecture
            yum will tell you what the root cause is (which package
            requires what). You can try redoing the upgrade with
            --exclude sg3_utils-libs.otherarch ... this should give you an error
            message showing the root cause of the problem.
       
         2. You have multiple architectures of sg3_utils-libs installed, but
            yum can only see an upgrade for one of those arcitectures.
            If you don't want/need both architectures anymore then you
            can remove the one with the missing update and everything
            will work.
       
         3. You have duplicate versions of sg3_utils-libs installed already.
            You can use "yum check" to get yum show these errors.
       
       ...you can also use --setopt=protected_multilib=false to remove
       this checking, however this is almost never the correct thing to
       do as something else is very likely to go wrong (often causing
       much more problems).
       
       Protected multilib versions: sg3_utils-libs-1.28-10.el6_7.i686 != sg3_utils-libs-1.28-12.el6.x86_64

-----------------------------------------------------------------------

After excluding the sg3_utils-libs-1.28-10.el6_7.i686 version:

[root@dhcp43-228 yum.repos.d]# yum install glusterfs-ganesha --exclude sg3_utils-libs-1.28-10.el6_7.i686

it gives below error message:

Error: Package: sg3_utils-1.28-10.el6_7.x86_64 (External-RH-Gluster-3-NFS-Repository-1)
           Requires: sg3_utils-libs = 1.28-10.el6_7
           Installed: sg3_utils-libs-1.28-12.el6.x86_64 (@anaconda-RedHatEnterpriseLinux-201604140956.x86_64/6.8)

-----------------------------------------------------------------------

Only way to proceed ahead is to downgrade the sg3-utils-libs package and then install glusterfs-ganesha.

Verified this issue with latest 3.1.3 nightly build ( glusterfs-3.7.9-6 )

Done the redhat-storage-server and glusterfs-ganesha install on rhel6.8, both worked well.

Moving to verified state.

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.

https://access.redhat.com/errata/RHBA-2016:1240