From owner-freebsd-fs@FreeBSD.ORG Wed Feb 26 15:38:19 2014 Return-Path: Delivered-To: fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DF26A9EB for ; Wed, 26 Feb 2014 15:38:19 +0000 (UTC) Received: from smtp.01.com (smtp.01.com [199.36.142.181]) by mx1.freebsd.org (Postfix) with ESMTP id AA85B16AB for ; Wed, 26 Feb 2014 15:38:18 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp-out-1.01.com (Postfix) with ESMTP id 30B083F6213 for ; Wed, 26 Feb 2014 09:38:12 -0600 (CST) X-Virus-Scanned: amavisd-new at smtp-out-1.01.com Received: from smtp.01.com ([127.0.0.1]) by localhost (smtp-out-1.01.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XvOoZvUNcp1d for ; Wed, 26 Feb 2014 09:38:12 -0600 (CST) Received: from smtp.01.com (localhost [127.0.0.1]) by smtp-out-1.01.com (Postfix) with ESMTP id 117F33F6214 for ; Wed, 26 Feb 2014 09:38:12 -0600 (CST) Received: from localhost (localhost [127.0.0.1]) by smtp-out-1.01.com (Postfix) with ESMTP id EEFAF3F6213 for ; Wed, 26 Feb 2014 09:38:11 -0600 (CST) X-Virus-Scanned: amavisd-new at smtp-out-1.01.com Received: from smtp.01.com ([127.0.0.1]) by localhost (smtp-out-1.01.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id y-_hfomrA7K3 for ; Wed, 26 Feb 2014 09:38:11 -0600 (CST) Received: from newman.zxcvm.com (unknown [38.109.103.138]) by smtp-out-1.01.com (Postfix) with ESMTPSA id 911E23F6211 for ; Wed, 26 Feb 2014 09:38:11 -0600 (CST) From: Jason Breitman Subject: Identify the ZFS Snapshot Disk Hog Message-Id: Date: Wed, 26 Feb 2014 10:38:09 -0500 To: fs@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 7.2 \(1874\)) X-Mailer: Apple Mail (2.1874) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.17 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Feb 2014 15:38:19 -0000 What is my best tool or set of command line scripts to find the snapshot = or snapshots that are the disk hogs? =20 I am familiar with the scripts zfs list -r -o space,refer -t snapshot tank/username and with the command below to identify the estimated space savings zfs destroy -nv tank/username@zfs-auto-snap_monthly-2013-11-01-03h00 When I go through and destroy the snapshots from oldest to the most = recent, I do not seem to reclaim any space and am forced to believe = there must be a better way. The users in questions are developers so there is churn causing the = snapshots to be larger than an average user which means I will need to = create a process I can use on a regular basis. I am using refquota for each user. OS: Freebsd 9.1 # zpool upgrade -v This system is currently running ZFS pool version 28. The following versions are supported: VER DESCRIPTION --- -------------------------------------------------------- 1 Initial ZFS version 2 Ditto blocks (replicated metadata) 3 Hot spares and double parity RAID-Z 4 zpool history 5 Compression using the gzip algorithm 6 bootfs pool property 7 Separate intent log devices 8 Delegated administration 9 refquota and refreservation properties 10 Cache devices 11 Improved scrub performance 12 Snapshot properties 13 snapused property 14 passthrough-x aclinherit 15 user/group space accounting 16 stmf property support 17 Triple-parity RAID-Z 18 Snapshot user holds 19 Log device removal 20 Compression using zle (zero-length encoding) 21 Deduplication 22 Received properties 23 Slim ZIL 24 System attributes 25 Improved scrub stats 26 Improved snapshot deletion performance 27 Improved snapshot creation performance 28 Multiple vdev replacements For more information on a particular version, including supported = releases, see the ZFS Administration Guide. # zfs upgrade -v The following filesystem versions are supported: VER DESCRIPTION --- -------------------------------------------------------- 1 Initial ZFS filesystem version 2 Enhanced directory entries 3 Case insensitive and filesystem user identifier (FUID) 4 userquota, groupquota properties 5 System attributes For more information on a particular version, including supported = releases, see the ZFS Administration Guide. Jason Breitman jbreitman@zxcvm.com