Date: Mon, 10 Aug 2015 07:55:13 -0500 From: Rick Romero <rick@havokmon.com> To: freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op Message-ID: <20150810075513.Horde.dA37JPvUlgePL8j1izaLPg7@www.vfemail.net> In-Reply-To: <55C872FD.1060608@herveybayaustralia.com.au> References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl> <55C872FD.1060608@herveybayaustralia.com.au>
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Quoting Da Rock <freebsd-fs@herveybayaustralia.com.au>: > On 10/08/2015 18:42, 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. >> >> Hi, >> >> Are the versions of your FreeBSD also equal? > > No. 9.1 to 10.1. >> 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. > > Crap. So I guess my best will be to compress as best I can for the > moment or something like that. >> As a second note I think is is more or less general understanding that a >> ZFS systeem needs a lot more space left free than 5% to actual be able >> to perform. >> Last number I remember as sensible maximum fill level is around 70%. >> If you go over it, your system is going to be busy with ZFS bookkeeping >> instead of data storage. > > Yeah, I noticed that. Something I'm working on... backlog of sorting > activities really :) Once I'm done it'll drop to well below 50% I'd say. >> (One of the things I remember from the ZFS lecture by Kirk McKusik, >> which I no longer can find on YouTube :( ) >> >> --WjW > > Thanks for the info - I owe you a beer! At least I know why now and > eases my growing headache from banging my head on the brick wall. Also check out ashift. I have hundreds of thousands of small files and the ashift change ate up 25% additional space. Rick
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