From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Bart Van Assche" Subject: Re: Integration of SCST in the mainstream Linux kernel Date: Wed, 6 Feb 2008 11:22:00 +0100 Message-ID: References: <47A05CBD.5050803@vlnb.net> <1202145901.3096.49.camel@localhost.localdomain> <1202151989.11265.576.camel@haakon2.linux-iscsi.org> <20080204210121.GF18682@fieldses.org> <47A7986B.1070206@garzik.org> <47A8A1C8.2010407@garzik.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wx-out-0506.google.com ([66.249.82.235]:43104 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756445AbYBFKWC (ORCPT ); Wed, 6 Feb 2008 05:22:02 -0500 Received: by wx-out-0506.google.com with SMTP id h31so3258934wxd.4 for ; Wed, 06 Feb 2008 02:22:01 -0800 (PST) In-Reply-To: <47A8A1C8.2010407@garzik.org> Content-Disposition: inline Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Jeff Garzik Cc: Linus Torvalds , "J. Bruce Fields" , "Nicholas A. Bellinger" , James Bottomley , Vladislav Bolkhovitin , Andrew Morton , FUJITA Tomonori , linux-scsi@vger.kernel.org, scst-devel@lists.sourceforge.net, Linux Kernel Mailing List , Mike Christie On Feb 5, 2008 6:50 PM, Jeff Garzik wrote: > For remotely accessing data, iSCSI+fs is quite simply more overhead than > a networked fs. With iSCSI you are doing > > local VFS -> local blkdev -> network > > whereas a networked filesystem is > > local VFS -> network There are use cases than can be solved better via iSCSI and a filesystem than via a network filesystem. One such use case is when deploying a virtual machine whose data is stored on a network server: in that case there is only one user of the data (so there are no locking issues) and filesystem and block device each run in another operating system: the filesystem runs inside the virtual machine and iSCSI either runs in the hypervisor or in the native OS. Bart Van Assche.