Binary package “corosync-qdevice” in ubuntu disco

cluster engine quorum device daemon

 corosync-qdevice is a daemon running on each node of a cluster. It provides
 a configured number of votes to the quorum subsystem based on a third-party
 arbitrator's decision. Its primary use is to allow a cluster to sustain more
 node failures than standard quorum rules allow. It is recommended for clusters
 with an even number of nodes and highly recommended for 2 node clusters.