A friend has his own CNC router; he built it himself in 2009 and has been upgrading it ever since – though it’s been a while since it was last used.| calbryant.uk
Quorum systems allow consistency of replicated data; every time a group of servers needs to agree on something, a quorum is involved in the decisions. An example could be the leaderless databases, such as Dynamo. Read-write quorums define two configurable values, R and W.| Samuele Resca