From:
http://www.redhat.com/rhecm/rest-rhecm/jcr/repository/collaboration/jcr:system/jcr:versionStorage/6945bd2d0a05260142050b2f447f7fb5/1/jcr:frozenNode/rh:resourceFile

WHAT’S NEW IN RED HAT ENTERPRISE LINUX 7

TECHNOLOGY OVERVIEW

IN-PLACE UPGRADE

Red Hat Enterprise Linux 7 provides support that simplifies the task of 
performing in-place upgrades.
A pre-upgrade assistant package is provided in the Red Hat Enterprise 
Linux 6.5 zstream, which
reports what can be upgraded in-place and what will have to be done 
manually.

The report describes the issues and links to knowledgebase articles 
available in the Red Hat
Customer Portal.

The report includes information on configuration files that will be 
modified and identifies existing
user-modified configuration files, recommending some to be manually 
checked. At that point, the
administrator can decide if the end result of an in-place upgrade is 
sufficient for their needs. Upon
executing the in-place upgrade, the administrator can then inspect the 
final results and decide to
complete the upgrade.

End quote.

Is the above zstream mechanism available for SL6.5 to SL7x migration? If 
not, is there to be a functional equivalent?

For those who are RHEL licensees, has anyone used the above mentioned 
in-place upgrade mechanism? If so, is it effective?

Yasha Karant