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Allows DM to accomodate future structure changes during the RHEL6                                                                                                      
life-cycle.  The relatively recent request-based multipath support                                                                                                     
made various changes to 'struct multipath'.  Also a future IBM abort                                                                                                   
request patchset will require this features flag to be available:                                                                                                      
https://www.redhat.com/archives/dm-devel/2010-May/msg00014.html

This feature request did not get resolved in time for Feature Freeze
for the current Red Hat Enterprise Linux release and has now been
denied. You may re-open your request by requesting your support
representative to propose it for the next release.

Patch(es) available on kernel-2.6.32-31.el6

This is very simple change -- only reviewed that the above mentioned change is in drivers/md/dm-mpath.c in kernel-2.6.32-31.el6 and that it is possible to compile the code.

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.