Pacemaker ke software e bulehileng ea mohloli o phahameng oa ho fumaneha ha lisebelisoa tse sebelisoang ho lihlopha tsa lik'homphieutha ho tloha 2004. Ho fihlela hoo e ka bang ka 2007, e ne e le karolo ea morero oa Linux-HA, 'me e arotsoe hore e be morero oa eona. E sebelisa li-API tse 'maloa bakeng sa ho laola lisebelisoa, empa API ea eona e ratoang molemong ona ke API ea Open Cluster Framework resource agent.