From owner-freebsd-fs@freebsd.org Mon Aug 10 09:46:46 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 BFC3E99813D for ; Mon, 10 Aug 2015 09:46:46 +0000 (UTC) (envelope-from freebsd-fs@herveybayaustralia.com.au) Received: from mail.unitedinsong.com.au (mail.unitedinsong.com.au [150.101.178.33]) (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 6F857A67 for ; Mon, 10 Aug 2015 09:46:46 +0000 (UTC) (envelope-from freebsd-fs@herveybayaustralia.com.au) Received: from [192.168.0.170] (laptop1.herveybayaustralia.com.au [192.168.0.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.unitedinsong.com.au (Postfix) with ESMTPSA id 2100061F85; Mon, 10 Aug 2015 19:46:40 +1000 (EST) Subject: Re: Urgently need some help solving lost space due to snapshots during receive op To: Willem Jan Withagen , freebsd-fs@freebsd.org References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl> From: Da Rock Message-ID: <55C872FD.1060608@herveybayaustralia.com.au> Date: Mon, 10 Aug 2015 19:46:37 +1000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <55C863DE.3000200@digiware.nl> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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: Mon, 10 Aug 2015 09:46:46 -0000 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. > >> I have done a recursive snapshot on the system and a send/receive over >> ssh. Near the end, it final croaks and says no space left. The snapshot >> it is sending is nowhere to be found on the receiving system. >> >> Ok, checked free space - should be enough - so I try a simple cp op on >> the last dataset, but then it again croaks no space near the end, but at >> least I have some data. >> >> Checking space again, it says free space of an expected value, but still >> won't allow further data. >> >> I can't seem to figure out why this is not working, I'm currently trying >> using compression on the dataset to see if it can't squeeze it on there, >> but I still have a couple of no space messages so far. >> >> Where has my space gone?! >> >> TIA >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"