I-Pacemaker iwumthombo ovulekile wesofthiwe yomphathi wokutholakala okuphezulu esetshenziswa kumaqoqo ekhompiyutha kusukela ngo-2004. Kuze kube cishe ngo-2007, yayiyingxenye yephrojekthi ye-Linux-HA, yase ihlukaniswa yaba iphrojekthi yayo. Isebenzisa ama-API ambalwa ukuze ilawule izinsiza, kodwa i-API yayo encamelayo ngale njongo i-API yesisetshenziswa se-Open Cluster Framework.