X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 6E2E19FA43C for ; Fri, 2 Jun 2006 15:43:10 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 06458-07 for ; Fri, 2 Jun 2006 15:43:02 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id DF19E9FA5B5 for ; Fri, 2 Jun 2006 15:43:01 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.6/8.13.6) with ESMTP id k52Ih0vP009065; Fri, 2 Jun 2006 14:43:00 -0400 (EDT) To: carlosreimer@terra.com.br cc: pgsql-performance@postgresql.org Subject: Re: Initial database loading and IDE x SCSI In-reply-to: References: Comments: In-reply-to message dated "Fri, 02 Jun 2006 15:25:57 -0300" Date: Fri, 02 Jun 2006 14:43:00 -0400 Message-ID: <9064.1149273780@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200606/11 X-Sequence-Number: 19368 writes: > I would like to know if my supposition is right. > Considering an environment with only one hard disk attached to a server, an > initial loading of the database probably is much faster using an IDE/ATA > interface with write-back on than using an SCSI interface. Thatīs because of > the SCSI command interface overhead. I *seriously* doubt that. If you see a difference in practice it's likely got more to do with the SCSI drive not lying about write-complete ... regards, tom lane