In the context of PostgreSQL 7.4, running over Linux Suse 9.0, I have some doubts that wanted to evacuate: In which processes impacts the property fsync? Which can be the problem to use fsync in false? When use fsync = false, the effective recording of the data in disk is done for criteria of the operating system, ¿ Is exact? Considering fsync = false, checkpoint_timeout=300. It given a crash of the operating system, after normally db shutdown. At db startup, there was corruption of data and a pg_resetlog was done. It is possible to lose data changed previous to last checkpoint ? Thanks, Fabio