Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 14 Feb 2002 11:16:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 14 Feb 2002 11:16:02 -0500 Received: from chaos.analogic.com ([204.178.40.224]:56198 "EHLO chaos.analogic.com") by vger.kernel.org with ESMTP id ; Thu, 14 Feb 2002 11:15:32 -0500 Date: Thu, 14 Feb 2002 11:17:42 -0500 (EST) From: "Richard B. Johnson" Reply-To: root@chaos.analogic.com To: Linux kernel Subject: Strange disk-write speeds Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Weird. I have two identical SCSI drives. They both synchronize at 40 Mb/s on my Buslogic controller. They are the two ... Vendor: SEAGATE Model: ST318233LWV Rev: 0002 ... drives shown below. They both have ext2 file-systems occupying a single partition. The time to write a file that fills up the file-system on the "Id: 01" drive is about 1/2 an hour and the time to write a file that fills up the file-system on "Id: 02" is about 1/2 day! This is with the file created with "O_SYNC". If the file is not created with "O_SYNC", there is no apparent difference in write speed. If I swap the jumpers on the two drives to isolate the drives from the problem, the slooooo drive is the logical "ID: 02", always... not the physical one! Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: SEAGATE Model: ST32171W Rev: 0484 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 01 Lun: 00 Vendor: SEAGATE Model: ST318233LWV Rev: 0002 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi0 Channel: 00 Id: 02 Lun: 00 Vendor: SEAGATE Model: ST318233LWV Rev: 0002 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi0 Channel: 00 Id: 04 Lun: 00 Vendor: YAMAHA Model: CRW6416S Rev: 1.0b Type: CD-ROM ANSI SCSI revision: 02 `uname -a` Linux chaos 2.4.1 #39 SMP Wed Jan 2 14:35:06 EST 2002 i686 Does anybody have a clue? Cheers, Dick Johnson Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips). I was going to compile a list of innovations that could be attributed to Microsoft. Once I realized that Ctrl-Alt-Del was handled in the BIOS, I found that there aren't any. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/