From owner-freebsd-hackers@FreeBSD.ORG Fri Sep 3 15:19:54 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1FFC216A4CE for ; Fri, 3 Sep 2004 15:19:54 +0000 (GMT) Received: from visp.engelschall.com (visp.engelschall.com [195.27.176.148]) by mx1.FreeBSD.org (Postfix) with ESMTP id 45A9343D41 for ; Fri, 3 Sep 2004 15:19:53 +0000 (GMT) (envelope-from rse@engelschall.com) Received: by visp.engelschall.com (Postfix, from userid 1005) id 2E8414CE5F8; Fri, 3 Sep 2004 17:19:52 +0200 (CEST) Received: by en1.engelschall.com (Postfix, from userid 10000) id 61F6128635; Fri, 3 Sep 2004 17:18:31 +0200 (CEST) Date: Fri, 3 Sep 2004 17:18:31 +0200 From: "Ralf S. Engelschall" To: freebsd-hackers@freebsd.org Message-ID: <20040903151831.GA84131@engelschall.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i Subject: Request for Review: UFS2 Snapshot Management Environment X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: rse@FreeBSD.org List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Sep 2004 15:19:54 -0000 Recently I was a little bit bored that ONTAP WAFL's .snapshot feature is such easy to use since years while on my FreeBSD 5 boxes the unprivileged users were not able to as easily use snapshots for retrieving old stages of their files. Hence I implemented a little snapshot management environment for FreeBSD around mount(8), mdconfig(8), amd(8) and cron(8) which lets me provide a similar environment than what people are used to from WAFL. To illustate the solution, let's give an example: On ONTAP WAFL filesystems users already can do: | $ cd /home/rse | $ echo "before" >foo.txt; sleep 3601 | $ echo "middle" >foo.txt; sleep 3601 | $ echo "after" >foo.txt | $ ls -la | fgrep .snapshot | $ cat .snapshot/hourly.1/foo.txt .snapshot/hourly.0/foo.txt foo.txt | before | middle | after On FreeBSD UFS2 filesystems users now also can do: | $ cd /home/rse | $ echo "before" >foo.txt; sleep 3601 | $ echo "middle" >foo.txt; sleep 3601 | $ echo "after" >foo.txt | $ ls -la /snap | grep hourly | $ cat /snap/home:hourly.1/rse/foo.txt /snap/home:hourly.0/rse/foo.txt foo.txt | before | middle | after Because it certainly is useful also for others, I've now packed the stuff together, added a little Makefile for ad-hoc "make install" and "make uninstall" and wrote both manual pages for the implemented commands plus a little summary and background article under http://people.freebsd.org/~rse/snapshot/ Now, enjoy happy snapshooting! And feel free to give me feedback, please... ;-) Yours, Ralf S. Engelschall rse@engelschall.com rse@FreeBSD.org