On Feb 3, 2016, at 16:13, Warren Young wrote: > A dying hard disk can do it. HDDs try to silently paper over I/O errors, but what they can’t hide is the time it takes to do this. If your HDD is constantly correcting errors at the oxide layer, it will be reeeeeallly sllllow. > > You can try running SMART tests on it, though that’s not guaranteed to show the problem. Well, it’s not “a” disk: it’s a HW RAID of about dozen (server grade) drives, with a VG/LV on top of that. Are there any log files I can check that test the underlying VG/LV health status? Alfred