From owner-freebsd-fs@freebsd.org Mon Aug 10 13:01:56 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 7808199D772 for ; Mon, 10 Aug 2015 13:01:56 +0000 (UTC) (envelope-from rcv-cmlja0BoYXZva21vbi5jb20AQDE0MzkyMTEzMTM=@vfemail.net) Received: from smtp101-5.vfemail.net (eightfive.vfemail.net [96.30.253.185]) (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 497A1848 for ; Mon, 10 Aug 2015 13:01:55 +0000 (UTC) (envelope-from rcv-cmlja0BoYXZva21vbi5jb20AQDE0MzkyMTEzMTM=@vfemail.net) Received: (qmail 30083 invoked by uid 89); 10 Aug 2015 12:55:13 -0000 Received: by simscan 1.4.0 ppid: 30076, pid: 30079, t: 0.0771s scanners:none Received: from unknown (HELO d3d3MTEwQDE0MzkyMTEzMTM=) (cmlja0BoYXZva21vbi5jb21AMTQzOTIxMTMxMw==@MTcyLjE2LjEwMC45MkAxNDM5MjExMzEz) by 172.16.100.61 with ESMTPA; 10 Aug 2015 12:55:13 -0000 Date: Mon, 10 Aug 2015 07:55:13 -0500 Message-ID: <20150810075513.Horde.dA37JPvUlgePL8j1izaLPg7@www.vfemail.net> From: Rick Romero To: freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl> <55C872FD.1060608@herveybayaustralia.com.au> In-Reply-To: <55C872FD.1060608@herveybayaustralia.com.au> User-Agent: Internet Messaging Program (IMP) H5 (6.2.2) X-VFEmail-Originating-IP: MTIuMzEuMTAwLjE0Ng== X-VFEmail-AntiSpam: Notify admin@vfemail.net of any spam, and include VFEmail headers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes Content-Transfer-Encoding: 8bit Content-Disposition: inline Content-Description: Plaintext Message X-Content-Filtered-By: Mailman/MimeDel 2.1.20 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 13:01:56 -0000 Quoting Da Rock : > 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