"Michel SALAIS" <msalais@xxxxxxx> writes: > \! dd if=/dev/zero of=$file_path bs=1024 count=100 This is fairly useless. As you already noticed, it corrupts the on-disk data but has no immediate effect on what's in shared buffers. Depending on what the timing of checkpoints is, the damage might even be self-healed due to writing out shared buffers after you corrupt the storage. The other problem with this specific test is that an all-zero page is considered to be a valid state. You may consider that a problem or not, but we're quite unlikely to change it, because doing so would create false failure reports. See the mechanisms around file extension. regards, tom lane
