From owner-freebsd-fs@freebsd.org Tue Aug 11 10:42:14 2015 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 19E0D99E696 for ; Tue, 11 Aug 2015 10:42:14 +0000 (UTC) (envelope-from freebsd-listen@fabiankeil.de) Received: from smtprelay04.ispgateway.de (smtprelay04.ispgateway.de [80.67.31.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id CCD26A60 for ; Tue, 11 Aug 2015 10:42:13 +0000 (UTC) (envelope-from freebsd-listen@fabiankeil.de) Received: from [84.44.152.119] (helo=fabiankeil.de) by smtprelay04.ispgateway.de with esmtpsa (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.84) (envelope-from ) id 1ZP6xQ-0004KC-V7; Tue, 11 Aug 2015 12:39:01 +0200 Date: Tue, 11 Aug 2015 12:38:58 +0200 From: Fabian Keil To: Da Rock Cc: freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op Message-ID: <12ccbf2f.401bf1f3@fabiankeil.de> In-Reply-To: <55C9CC22.7060802@herveybayaustralia.com.au> References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl> <60563a3f.3d0a7128@fabiankeil.de> <55C9CC22.7060802@herveybayaustralia.com.au> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; boundary="Sig_/31b=w1ZlrYj=7m7F8sxH8K2"; protocol="application/pgp-signature" X-Df-Sender: Nzc1MDY3 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Aug 2015 10:42:14 -0000 --Sig_/31b=w1ZlrYj=7m7F8sxH8K2 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Da Rock wrote: > On 10/08/2015 20:34, Fabian Keil wrote: > > Willem Jan Withagen wrote: > > > >> On 10-8-2015 06:42, Da Rock wrote: > >>> I'm trying to move a pool from one system to another - exact same hdd > >>> and config, different in other areas. Both register same space > >>> available, and so should be no issue. The old system is quite full - > >>> still at least 5% free though. > >> Are the versions of your FreeBSD also equal? > >> > >> Because in newer version, the free space reservation is significantly > >> bigger. So if disks are equal size, then with newer FreeBSDs you have > >> less usable space available. > >> Don't know the exact SVN commit where it happened. But there are more > >> question on this topic in the list, and they all boil down to the same > >> thing: ZFS needs more reserved space to be able to do certain things > >> without freezing the system. > >> > >> I've not read any suggestions that you can circumvent this setting. > > You can increase the usable space by increasing vfs.zfs.spa_slop_shift: > > > > fk@r500 ~ $sysctl vfs.zfs.spa_slop_shift > > vfs.zfs.spa_slop_shift: 6 > > fk@r500 ~ $zfs list tank > > NAME USED AVAIL REFER MOUNTPOINT > > tank 190G 34.4G 136K /tank > > fk@r500 ~ $sudo sysctl vfs.zfs.spa_slop_shift=3D7 > > vfs.zfs.spa_slop_shift: 6 -> 7 > > fk@r500 ~ $zfs list tank > > NAME USED AVAIL REFER MOUNTPOINT > > tank 190G 36.2G 136K /tank > What version is that on? I don't have the OID. It's available in 11-CURRENT (obviously), 10-STABLE and will be in the 10.2 release: https://svnweb.freebsd.org/base?view=3Drevision&revision=3D275490 Fabian --Sig_/31b=w1ZlrYj=7m7F8sxH8K2 Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlXJ0LIACgkQBYqIVf93VJ0PLgCcC9VU0vNNVmELJWjq0DSMcXY7 470AoLWZlMIsjZU7rsH4Me8IRfAPUdsj =5JGF -----END PGP SIGNATURE----- --Sig_/31b=w1ZlrYj=7m7F8sxH8K2--