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Description of problem:
Pacemaker offers superior resource management and dependency tracking to rgmanager in clustered environments. Effectively, it supersedes rgmanager's functionality in many ways while simultaneously providing users a staged upgrade path.
Resource agents written for rgmanager will work with pacemaker with minimal changes.
Unfortunately, pacemaker and rgmanager are not wire-compatible with one another, so there is no rolling upgrade path for rgmanager users for the rgmanager/pacemaker applications.
That said, with a conversion utility (#456897), it should be possible for pacemaker to provide the same services as rgmanager.
Additionally, because rgmanager now supports 'frozen' services, it should be possible to do a staged transition from rgmanager to pacemaker without affecting service availability:
* Freeze all services
* Kill rgmanager on all nodes
* Convert cluster configuration, but leave all resources as 'unmanaged' in the pacemaker CIB (= config file)
* Start pacemaker
* Flip each resource to 'managed'
Version-Release number of selected component (if applicable): 6.0.0