The Cluster Quorum Disk Daemon (qdiskd) is not used in Red Hat Enterprise Linux 7.
The new quorum implementation is provided by votequorum, which is included in the corosync package, and which has been extended to replace qdiskd for most use cases.
The extensions (wait_for_all, auto_tie_breaker, and last_man_standing) are fully documented in the votequorum(5) man page.
