Because the process state is stored in a database, the process engine can also recover running processes after a server shutdown, due to hardware failure or regular maintenance.

Consider a repairable system in series in which, for some reasons, individual units cannot get repaired in time after failure occurs, thereby creating a period of delayed maintenance.

The direct cause of this bearing 'failure was its improper assembly caused by improper maintenance procedure, and the root cause was too small internal radial clearance after mounting.