Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756971AbYCMTuL (ORCPT ); Thu, 13 Mar 2008 15:50:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754959AbYCMTt6 (ORCPT ); Thu, 13 Mar 2008 15:49:58 -0400 Received: from eth7959.sa.adsl.internode.on.net ([150.101.82.22]:59913 "EHLO hawking.rebel.net.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752585AbYCMTt5 (ORCPT ); Thu, 13 Mar 2008 15:49:57 -0400 Message-ID: <47D9856E.9010304@davidnewall.com> Date: Fri, 14 Mar 2008 06:20:06 +1030 From: David Newall User-Agent: Thunderbird 2.0.0.6 (X11/20071022) MIME-Version: 1.0 To: Daniel Phillips CC: david@lang.hm, Chris Friesen , Alan Cox , linux-kernel@vger.kernel.org Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet References: <200803092346.17556.phillips@phunq.net> <200803130216.03230.phillips@phunq.net> <200803131232.07879.phillips@phunq.net> In-Reply-To: <200803131232.07879.phillips@phunq.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 676 Lines: 13 Daniel Phillips wrote: > The period where you cannot access the data is downtime. If your script > just does a cp from a disk array to the ram device you cannot just read > from the backing store in that period because you will need to fail over > to the ramdisk at some point, and you cannot just read from the ramdisk > because it is not populated yet. Wouldn't a raid-1 set comprising disk + ramdisk do that with no downtime? -- 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/