Recently we’ve upgraded one of our virtualization clusters (more RAM), and in the course of this did an upgrade of the virtualization hosts from Ubuntu Lucid to RHEL 6.3 — without any service interruption. Read more
We’ve recently come across a case where stopping pacemaker (in this case via
/etc/init.d/heartbeat stop) didn’t work; and, similarly,
crm configure property maintenance-mode=false wouldn’t work.
The bug seems to have been a locking problem.