From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1FefRn-00021P-PM for qemu-devel@nongnu.org; Fri, 12 May 2006 17:45:19 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1FefRl-0001zs-4N for qemu-devel@nongnu.org; Fri, 12 May 2006 17:45:19 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1FefRk-0001zX-Sr for qemu-devel@nongnu.org; Fri, 12 May 2006 17:45:16 -0400 Received: from [130.113.64.9] (helo=cgpsrv1.cis.mcmaster.ca) by monty-python.gnu.org with esmtp (Exim 4.52) id 1FefTZ-0003uA-JZ for qemu-devel@nongnu.org; Fri, 12 May 2006 17:47:09 -0400 Received: from gabriel.cas.McMaster.CA ([130.113.70.96] verified) by cgpsrv1.cis.mcmaster.ca (CommuniGate Pro SMTP 4.1.8) with ESMTP-TLS id 97876134 for qemu-devel@nongnu.org; Fri, 12 May 2006 17:45:15 -0400 Subject: Re: [Qemu-devel] PATCH: Support for multi-file raw images From: Ryan Lortie In-Reply-To: <4464EE39.6000605@zipman.it> References: <1147329045.17542.15.camel@moonpix.desrt.ca> <4464EE39.6000605@zipman.it> Content-Type: text/plain Date: Fri, 12 May 2006 17:45:12 -0400 Message-Id: <1147470312.20722.1.camel@localhost.localdomain> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org On Fri, 2006-12-05 at 22:21 +0200, Flavio Visentin wrote: > OT for qemu, but if you use *rsync*, then only the changed part of the > file are copied, not all the file. Rsync was written just for this > reason, to avoid copying unneccessary unchanged data. But as soon as the modification stamp changes rsync still needs to scan the entire 20GB file to determine what part has changed. With two separate drives on a local system this takes exactly as long as just copying the entire file. Cheers