Date: Tue, 11 Aug 2015 12:38:58 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Da Rock <freebsd-fs@herveybayaustralia.com.au> 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>
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[-- Attachment #1 --] Da Rock <freebsd-fs@herveybayaustralia.com.au> wrote: > On 10/08/2015 20:34, Fabian Keil wrote: > > 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? > >> > >> 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=7 > > 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=revision&revision=275490 Fabian [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlXJ0LIACgkQBYqIVf93VJ0PLgCcC9VU0vNNVmELJWjq0DSMcXY7 470AoLWZlMIsjZU7rsH4Me8IRfAPUdsj =5JGF -----END PGP SIGNATURE-----home | help
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