Pacemaker yog qhov qhib-qhov chaw muaj peev txheej tswj hwm software siv hauv computer pawg txij li xyoo 2004. Txog rau xyoo 2007, nws yog ib feem ntawm Linux-HA qhov project, tom qab ntawd tau muab faib ua nws qhov project. Nws siv ntau APIs rau kev tswj cov peev txheej, tab sis nws qhov API nyiam rau lub hom phiaj no yog Open Cluster Framework tus neeg sawv cev API.