On Sun, Feb 25, 2007 at 23:11:01 +0100, Peter Kovacs <maxottovonstirlitz@xxxxxxxxx> wrote: > A related question: > Is it sufficient to disable write cache only on the disk where pg_xlog > is located? Or should write cache be disabled on both disks? With recent linux kernels you may also have the option to use write barriers instead of disabling caching. You need to make sure all of your stacked block devices will handle it and most versions of software raid (other than 1) won't. This won't be a lot faster, since at sync points the OS needs to order a cache flush, but it does give the disks a chance to reorder some commands in between flushes.
