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For a discussion, see original libqb bug [1402521] that the resolution of this bug (most likely) depends on.
(the link was meant to be clickable: [bug 1402521])
Corosync part is fixed in Corosync 3.x by https://github.com/corosync/corosync/pull/390. RHEL 7 is currently in quite a late phase and adding this feature requires non-trivial changes in LibQB code (corosync part depends on LibQB change). From upstream perspective - doesn't make too much sense to backport patch. copytruncate is far from perfect, but usually works quite well. And as mentioned, better solution is in (now stable) 3.x branch. Closing this as a NextRelease.