From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from len.romanrm.net ([91.121.75.85]:44466 "EHLO len.romanrm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751061AbdHVQpd (ORCPT ); Tue, 22 Aug 2017 12:45:33 -0400 Date: Tue, 22 Aug 2017 21:45:31 +0500 From: Roman Mamedov To: Ulli Horlacher Cc: linux-btrfs Subject: Re: netapp-alike snapshots? Message-ID: <20170822214531.44538589@natsu> In-Reply-To: <20170822142451.GI14804@rus.uni-stuttgart.de> References: <20170822132208.GD14804@rus.uni-stuttgart.de> <20170822142451.GI14804@rus.uni-stuttgart.de> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Tue, 22 Aug 2017 16:24:51 +0200 Ulli Horlacher wrote: > On Tue 2017-08-22 (15:44), Peter Becker wrote: > > Is use: https://github.com/jf647/btrfs-snap > > > > 2017-08-22 15:22 GMT+02:00 Ulli Horlacher : > > > With Netapp/waffle you have automatic hourly/daily/weekly snapshots. > > > You can find these snapshots in every local directory (readonly). > > > Example: > > > > > > framstag@fex:/sw/share: ll .snapshot/ > > > drwxr-xr-x framstag root - 2017-08-14 10:21:47 .snapshot/daily.2017-08-15_0010 > > > drwxr-xr-x framstag root - 2017-08-14 10:21:47 .snapshot/daily.2017-08-16_0010 > > > drwxr-xr-x framstag root - 2017-08-14 10:21:47 .snapshot/daily.2017-08-17_0010 > > > drwxr-xr-x framstag root - 2017-08-14 10:21:47 .snapshot/daily.2017-08-18_0010 > > > drwxr-xr-x framstag root - 2017-08-18 23:59:29 .snapshot/daily.2017-08-19_0010 > > > drwxr-xr-x framstag root - 2017-08-19 21:01:25 .snapshot/daily.2017-08-20_0010 > > > drwxr-xr-x framstag root - 2017-08-20 19:48:40 .snapshot/daily.2017-08-21_0010 > > > drwxr-xr-x framstag root - 2017-08-20 02:50:18 .snapshot/hourly.2017-08-20_1210 > > > drwxr-xr-x framstag root - 2017-08-20 02:50:18 .snapshot/hourly.2017-08-20_1610 > > > drwxr-xr-x framstag root - 2017-08-20 19:48:40 .snapshot/hourly.2017-08-20_2010 > > > drwxr-xr-x framstag root - 2017-08-21 00:42:28 .snapshot/hourly.2017-08-21_0810 > > > drwxr-xr-x framstag root - 2017-08-21 00:42:28 .snapshot/hourly.2017-08-21_1210 > > > drwxr-xr-x framstag root - 2017-08-21 13:05:28 .snapshot/hourly.2017-08-21_1610 > > btrfs-snap does not create local .snapshot/ sub-directories, but saves the > snapshots in the toplevel root volume directory. It is beneficial to not have snapshots in-place. With a local directory of snapshots, issuing things like "find", "grep -r" or even "du" will take an inordinate amount of time and will produce a result you do not expect. For some of those tools the problem can be avoided (by always keeping in mind to use "-x" with du, or "--one-file-system" with tar), but not for all of them. Personally I prefer to have a /snapshots directory on every FS, and e.g. timed snapshots of /home/username/src will live in /snapshots/home-username-src/. No point to hide it there with a dot either, as it's convenient to be able to browse older snapshots with GUI filemanagers (which hide dot-files by default). -- With respect, Roman