On Fri, 10 Jan 2020 at 06:35, Elliott, Robert (Servers) <elliott@xxxxxxx> wrote: > > What are all those reads to LBA 3750748672? Something is looking > for partition tables? > > You're using direct=1 so the page cache shouldn't be doing > prefetching. If you scribble over the start of a disk that can trigger udev rules to rescan partitions and maybe that is checking for a backup GPT... -- Sitsofe | http://sucs.org/~sits/