Date: Mon, 10 Aug 2015 13:37:58 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: Fabian Keil <freebsd-listen@fabiankeil.de> Cc: freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op Message-ID: <55C88D16.8090700@digiware.nl> In-Reply-To: <60563a3f.3d0a7128@fabiankeil.de> References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl> <60563a3f.3d0a7128@fabiankeil.de>
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On 10-8-2015 12:34, 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 Ah, Really nice info... Bet that that is going to "rescue" some of the migrating ZFS users. --WjW
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