Matthew Wakeling: > The data needs to be written first to the WAL, in order to provide > crash-safety. So you're actually writing 1600MB, not 800. I come back again to saving WAL to another disk. Now, after all, I wonder: Doesn't the server wait anyway until WAL was written to disk? So, if true, does it should not really matter if WAL is written to another disk then or not (besides some savings by 2x hd cache and less hd head moves). Felix -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance