Date: Mon, 10 Aug 2015 12:34:53 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Willem Jan Withagen <wjw@digiware.nl> Cc: freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op Message-ID: <60563a3f.3d0a7128@fabiankeil.de> In-Reply-To: <55C863DE.3000200@digiware.nl> References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl>
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--Sig_/cdFuXofdsTrXI7cHWY/.W6B Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Willem Jan Withagen <wjw@digiware.nl> 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? >=20 > 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. >=20 > 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 Fabian --Sig_/cdFuXofdsTrXI7cHWY/.W6B Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlXIfkoACgkQBYqIVf93VJ3EnACgjF1IaDtJFAX3qxTVaUI202lW qdIAn0VKfJtTGMPSDsW8ouj69sumVl+j =Rhh7 -----END PGP SIGNATURE----- --Sig_/cdFuXofdsTrXI7cHWY/.W6B--
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