From owner-freebsd-stable@FreeBSD.ORG Sat Sep 13 04:14:55 2014 Return-Path: <owner-freebsd-stable@FreeBSD.ORG> Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 41724761; Sat, 13 Sep 2014 04:14:55 +0000 (UTC) Received: from ipmail05.adl6.internode.on.net (ipmail05.adl6.internode.on.net [150.101.137.143]) by mx1.freebsd.org (Postfix) with ESMTP id 99CF4403; Sat, 13 Sep 2014 04:14:53 +0000 (UTC) Received: from ppp118-210-249-247.lns20.adl6.internode.on.net (HELO leader.local) ([118.210.249.247]) by ipmail05.adl6.internode.on.net with ESMTP; 13 Sep 2014 13:44:52 +0930 Message-ID: <5413C4BA.7080302@ShaneWare.Biz> Date: Sat, 13 Sep 2014 13:44:50 +0930 From: Shane Ambler <FreeBSD@ShaneWare.Biz> User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Andriy Gapon <avg@FreeBSD.org>, freebsd-stable@FreeBSD.org, amvandemore@gmail.com, killing@multiplay.co.uk Subject: Re: Snapshots that won't delete [was: Re: ZFS on root booting...] References: <FE64613E-B083-436C-8A08-13923ED88797@icloud.com> <7F008C560B48412AB66A1EBD9382DDAE@multiplay.co.uk> <CC276D59-F83C-4C78-BD9B-84040D3DE3E4@icloud.com> <9315C209-701A-49EF-85D3-ACCCD1513EC3@icloud.com> <959C54D2C8EB4AC8983DC1DA3CE042E3@multiplay.co.uk> <9F24DD48FBEA46C39F98DF600D46DA1A@multiplay.co.uk> <B4A16726-142D-458A-9B3A-153BDD579A63@icloud.com> <BAB9F50F-9D2C-435C-8035-659E2B412FC7@icloud.com> <4450778127F4407EB6566A0FE11CD651@multiplay.co.uk> <090135D4-8B1F-42B4-82FC-6FD2F1DBDDA8@icloud.com> <20140911071233.GA50585@anubis.morrow.me.uk> <541280D8.9090500@ShaneWare.Biz> <541293D0.4080907@FreeBSD.org> In-Reply-To: <541293D0.4080907@FreeBSD.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-stable>, <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/> List-Post: <mailto:freebsd-stable@freebsd.org> List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, <mailto:freebsd-stable-request@freebsd.org?subject=subscribe> X-List-Received-Date: Sat, 13 Sep 2014 04:14:55 -0000 On 12/09/2014 16:03, Andriy Gapon wrote: > On 12/09/2014 08:12, Shane Ambler wrote: >> On 11/09/2014 16:42, Ben Morrow wrote: >>> Recently, though, my dump script has started having occasional problems >>> with snapshots that won't delete. Pending further investigation I have >>> been renaming them to allow the recursive delete to succeed, and (so >>> far) rebooting has always made it possible to get rid of them. >> >> I have seen that issue with 9.2 and at least one other person mentioned >> it as well. I currently have a snapshot that I accessed at least 3 weeks >> ago and renamed to keep rotations working and have not accessed since, >> it still won't delete as it is busy. I can only delete these snapshots >> after a reboot. >> >> The only cause I know is accessing the snapshot. >> I can simply ls .zfs/snapshot/daily.01/somefolder to prevent it being >> deleted. With a manual zfs destroy I get "dataset is busy" and have not >> found a way to find any process that has hold of it. > > Look for it in `mount` output. There is no entry in mount or df for the snapshot The zfs mounted property is only yes for real filesystems - all snapshots show as '-' On 12/09/2014 16:44, Adam Vande More wrote: > > What exactly have you tried and what were the results? zfs rename works zfs destroy fails both before and after rename with 'cannot destroy snapshot zrpleader/home/shane@daily.bad: dataset is busy' I can't find anything with fstat or lsof to indicate a process has anything open within the snapshot path. I haven't done a lot of digging for info so don't think I've tried anything else yet. On 12/09/2014 17:49, Steven Hartland wrote: > > Is there a hold on the snapshot? Don't know how to tell that. The first time I encountered this I think I sent xfe to the snapshot dir and opened a video with vlc. The one I have from a few weeks ago I did cp ~/.zfs/snapshot/daily.01/folder/file ~/folder/ from a terminal as a normal user. The original snapshots were created with zfs snapshot -r zrpleader@daily.01 I have manually destroyed each of the individual filesystem snapshots that I could and have two bad snapshots remaining, one from a few weeks ago and one from a few days ago. Both of these I can not access now. ls .zfs/snapshot/daily.bad says 'ls: .zfs/snapshot/daily.bad: Device busy' -- FreeBSD - the place to B...Serving Data Shane Ambler