From owner-freebsd-hackers@FreeBSD.ORG Wed Apr 21 14:14:16 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4714F16A4CE for ; Wed, 21 Apr 2004 14:14:16 -0700 (PDT) Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [134.226.81.11]) by mx1.FreeBSD.org (Postfix) with SMTP id 7D17143D3F for ; Wed, 21 Apr 2004 14:14:15 -0700 (PDT) (envelope-from dwmalone@maths.tcd.ie) Received: from walton.maths.tcd.ie by salmon.maths.tcd.ie with SMTP id ; 21 Apr 2004 22:14:14 +0100 (BST) Date: Wed, 21 Apr 2004 22:14:13 +0100 From: David Malone To: Julian Elischer Message-ID: <20040421211413.GA50578@walton.maths.tcd.ie> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.3i Sender: dwmalone@maths.tcd.ie cc: hackers@freebsd.org cc: Garance A Drosihn Subject: Re: how to flush out cache.? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Apr 2004 21:14:16 -0000 On Wed, Apr 21, 2004 at 01:47:43PM -0700, Julian Elischer wrote: > ingenious, but, no we can't do that.. > As I mentionned.. someone suggested using 'dump' > to extract the file from raw disk and checksumming that... :-) If it is SCSI, you could probably put a second controler on the SCSI bus, and when you want to checksum the file you mount the filesystem read-only using using the device for the same disk via the second SCSI controler. David.