Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758475Ab1FKBJc (ORCPT ); Fri, 10 Jun 2011 21:09:32 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:38234 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758354Ab1FKBJ3 convert rfc822-to-8bit (ORCPT ); Fri, 10 Jun 2011 21:09:29 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=TmLgUvXVUr3cw5fu/eXNUY14i2YA5fRv2egn587KD+Ehr1tm8HfR6p+jYau4i7QB9P T268MWVcxqvIiYnAy6LUeGQsc8HIxhT5yVCs0lwTOHKcxZAtbPSpnDMSkzpniOvfk/7m UVRrErfXf+oVYlyWQS4fyLXhdPF9EpGy4kdO0= MIME-Version: 1.0 In-Reply-To: <52699.1307746288@turing-police.cc.vt.edu> References: <1307459283-22130-1-git-send-email-amir73il@users.sourceforge.net> <52699.1307746288@turing-police.cc.vt.edu> Date: Sat, 11 Jun 2011 04:09:27 +0300 X-Google-Sender-Auth: rtMCWJXeaI7OT4EoZ2cdoU4rmNA Message-ID: Subject: Re: [PATCH v1 00/30] Ext4 snapshots From: "Amir G." To: Valdis.Kletnieks@vt.edu Cc: Lukas Czerner , Yongqiang Yang , linux-ext4@vger.kernel.org, tytso@mit.edu, linux-kernel@vger.kernel.org, sandeen@redhat.com Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 940 Lines: 24 On Sat, Jun 11, 2011 at 1:51 AM, wrote: > On Thu, 09 Jun 2011 13:54:13 +0300, "Amir G." said: > >> Why do you keep saying 'backup only'? >> There is a huge difference between having long lived snapshots, >> like CTERA products have, and temporary snapshot for backup >> purpose (for which LVM is adequate). > > I must have blinked somewhere - I'm not convinced LVM is even "adequate" for > backup purposes. ?In particular, how does an LVM-level snapshot deal with the > "metadata in memory" problem (basically the exact same problem as running fsck > on a disk partition that is already mounted)? > > It uses the filesystem freeze API. Same as ext4 snapshots. Amir. -- 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/