From owner-freebsd-questions@FreeBSD.ORG Wed Jun 16 11:27:38 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 428C416A4CE for ; Wed, 16 Jun 2004 11:27:38 +0000 (GMT) Received: from internet.potentialtech.com (h-66-167-251-6.phlapafg.covad.net [66.167.251.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1D8AC43D39 for ; Wed, 16 Jun 2004 11:27:38 +0000 (GMT) (envelope-from wmoran@potentialtech.com) Received: from working.potentialtech.com (pa-plum1c-102.pit.adelphia.net [24.53.179.102]) by internet.potentialtech.com (Postfix) with ESMTP id 7A4AB69A71; Wed, 16 Jun 2004 07:26:37 -0400 (EDT) Date: Wed, 16 Jun 2004 07:26:36 -0400 From: Bill Moran To: Rob Message-Id: <20040616072636.539065e6.wmoran@potentialtech.com> In-Reply-To: <40D00F37.7040102@users.sourceforge.net> References: <40D00F37.7040102@users.sourceforge.net> Organization: Potential Technologies X-Mailer: Sylpheed version 0.9.10 (GTK+ 1.2.10; i386-portbld-freebsd4.9) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit cc: freebsd-questions@freebsd.org Subject: Re: Harddisk "UDMA ICRC error..." from kernel at bootup. What does it mean? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jun 2004 11:27:38 -0000 Rob wrote: > Hi, > > A friend of mine switched from Windows XP to FreeBSD, because I "garanteed" that FreeBSD > would be faster. I also want to optimize performance as much as possible. I'm therefore > worried about the following messages from the kernel at bootup: > > [...snip...] > ad0: 16448MB [33420/16/63] at ata0-master UDMA66 > ad1: 76319MB [155061/16/63] at ata0-slave UDMA66 > acd0: CD-RW at ata1-master PIO4 > Mounting root from ufs:/dev/ad0s1a > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895 (ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895 (ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895 (ad1s5 bn 93787664; cn 5838 tn 3 sn 5) retrying > ad1s5c: UDMA ICRC error reading fsbn 93787664 of 46885768-46885895 (ad1s5 bn 93787664; cn 5838 tn 3 sn 5) falling back to PIO mode > > --- > > Both harddisks are on the same IDE 40-pin cable as master and slave. > ad0 is the FreeBSD formatted harddisk; one slice and several FreeBSD partitions. > ad1 is from a former Windows XP installation, with two partitions: ad1s5 (ntfs) and ad1s6 (msdos). > > I don't understand much of the lines above. Super-simplified: it's telling you it gets checksum erros when it tries to talk to the drives at ATA66 speed, so it slows down and is then successful. > The last line says it falls back to PIO mode due to errors with ad1s5c. > What does that mean? Will it use the slow 16.6 MB/s data exchange from disk to host? Yes. Windows is probably already running at this speed, but it just doesn't bother to inform you. > Does this then also imply that both disks use PIO/slow data exchange speed? > (remember: both disks are on the same cable to the motherboard). Yes. > What can I do to get things better and faster? Get an 80 conductor cable (probably). > And also: is this "UDMA ICRC error" because it's a Windows/DOS partition? > Would formatting to FreeBSD filesystem solve the problem? No, it's more likely because of the 40 pin cable. -- Bill Moran Potential Technologies http://www.potentialtech.com