Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933043AbXHEAnc (ORCPT ); Sat, 4 Aug 2007 20:43:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758309AbXHEAnZ (ORCPT ); Sat, 4 Aug 2007 20:43:25 -0400 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:52425 "EHLO the-village.bc.nu" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1758797AbXHEAnY (ORCPT ); Sat, 4 Aug 2007 20:43:24 -0400 Date: Sun, 5 Aug 2007 01:49:26 +0100 From: Alan Cox To: Claudio Martins Cc: Jeff Garzik , Ingo Molnar , =?UTF-8?B?SsO2cm4=?= Engel , Linus Torvalds , Peter Zijlstra , linux-mm@kvack.org, Linux Kernel Mailing List , miklos@szeredi.hu, akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com, tomoki.sekiyama.qu@hitachi.com, nikita@clusterfs.com, trond.myklebust@fys.uio.no, yingchao.zhou@gmail.com, richard@rsk.demon.co.uk, david@lang.hm Subject: Re: [PATCH 00/23] per device dirty throttling -v8 Message-ID: <20070805014926.400d0608@the-village.bc.nu> In-Reply-To: <200708050051.40758.ctpm@ist.utl.pt> References: <20070803123712.987126000@chello.nl> <46B4E161.9080100@garzik.org> <20070804224706.617500a0@the-village.bc.nu> <200708050051.40758.ctpm@ist.utl.pt> X-Mailer: Claws Mail 2.9.1 (GTK+ 2.10.13; i386-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 847 Lines: 18 > Can you give examples of backup solutions that rely on atime being updated? > I can understand backup tools using mtime/ctime for incremental backups (like > tar + Amanda, etc), but I'm having trouble figuring out why someone would > want to use atime for that. HSM is the usual one, and to a large extent probably why Unix originally had atime. Basically migrating less used files away so as to keep the system disks tidy. Its not something usally found on desktop boxes so it doesn't in anyway argue against the distribution using noatime or relative atime, but on big server boxes it matters - 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/