Embodiments include methods, reconfiguration and verification systems, and computer program products automating manual reconfiguration and verification process. Aspects include manually configuring processing units (Pus) through LPAR partition's reconfiguration panel using a hardware management console, creating by an computer operating system an MSGLOG API to allow a test program (TP) to communicate with an automation system's automation program (AP), TP generating reconfiguration tests (RT) of PUs and transmitting RTs to AP while holding an MSGLOG API lock, and TP going to sleep for a predetermined time using a sleep timer to allow AP to perform tests, determining whether sleep timer is expired. When sleep timer is expired, print a sleep timer expiration error, and exit. Otherwise, TP obtains states of PUs under RTs, and determine whether results of RTs are correct. When results of RTs are not correct, test program prints reconfiguration test failure error messages, and exit.