From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:42450 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752160AbaKUXmD (ORCPT ); Fri, 21 Nov 2014 18:42:03 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Xrxpw-0003WS-H4 for linux-btrfs@vger.kernel.org; Sat, 22 Nov 2014 00:42:00 +0100 Received: from ip68-231-22-224.ph.ph.cox.net ([68.231.22.224]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 22 Nov 2014 00:42:00 +0100 Received: from 1i5t5.duncan by ip68-231-22-224.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 22 Nov 2014 00:42:00 +0100 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: BTRFS messes up snapshot LV with origin Date: Fri, 21 Nov 2014 23:41:49 +0000 (UTC) Message-ID: References: <54699CC7.1050909@swiftspirit.co.za> <546A46A5.8030603@inwind.it> <27BDAC3B-789C-4477-B065-E703CE425F54@colorremedies.com> <546B68F8.6080008@ubuntu.com> <546BA96D.4050805@ubuntu.com> <2A57F99C-80AA-4FD4-AA41-57F02AD4E1A2@colorremedies.com> <546CB531.2060509@ubuntu.com> <20141121042814.GR17395@hungrycats.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Duncan posted on Fri, 21 Nov 2014 22:49:06 +0000 as excerpted: > Chris Murphy posted... >> That's not true for thin volume snapshots. They take up next to no >> space upon creation, they don't need space reserved in advance. > > Thus the mention of compression if necessary. Thin-volume snapshots are > effectively compression by another name, and a raw dd from them should > compress pretty much equally well, depending on compression method > chosen, of course. =:^) Oops, I mis-parsed "thin". Good point and thanks, Chris. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman