From owner-freebsd-fs@FreeBSD.ORG Tue Mar 14 15:30:33 2006 Return-Path: <owner-freebsd-fs@FreeBSD.ORG> X-Original-To: freebsd-fs@FreeBSD.org Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9933916A5A4; Tue, 14 Mar 2006 15:30:33 +0000 (UTC) (envelope-from anderson@centtech.com) Received: from mh2.centtech.com (moat3.centtech.com [207.200.51.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1313943D64; Tue, 14 Mar 2006 15:30:31 +0000 (GMT) (envelope-from anderson@centtech.com) Received: from [10.177.171.220] (neutrino.centtech.com [10.177.171.220]) by mh2.centtech.com (8.13.1/8.13.1) with ESMTP id k2EFUUj0075140; Tue, 14 Mar 2006 09:30:30 -0600 (CST) (envelope-from anderson@centtech.com) Message-ID: <4416E193.30004@centtech.com> Date: Tue, 14 Mar 2006 09:30:27 -0600 From: Eric Anderson <anderson@centtech.com> User-Agent: Thunderbird 1.5 (X11/20060112) MIME-Version: 1.0 To: Robert Watson <rwatson@FreeBSD.org> References: <4411A43E.5080500@centtech.com> <20060311043658.GA39298@xor.obsecurity.org> <4412576E.2030505@centtech.com> <20060311053201.GB40172@xor.obsecurity.org> <4414FB7B.2050203@centtech.com> <20060314121908.G36625@fledge.watson.org> In-Reply-To: <20060314121908.G36625@fledge.watson.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV 0.87.1/1329/Mon Mar 13 18:22:03 2006 on mh2.centtech.com X-Virus-Status: Clean Cc: freebsd-fs@FreeBSD.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Snapshot ufs blocking X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems <freebsd-fs.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>, <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs> List-Post: <mailto:freebsd-fs@freebsd.org> List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>, <mailto:freebsd-fs-request@freebsd.org?subject=subscribe> X-List-Received-Date: Tue, 14 Mar 2006 15:30:33 -0000 Robert Watson wrote: > > On Sun, 12 Mar 2006, Eric Anderson wrote: > >>> Thanks. There is an uncommitted patch being circulated that is >>> believed to address all remaining problems. It relies on other >>> fixes in -CURRENT that are not yet merged, but if you're able to >>> test it let me know and I'll forward. >> >> I can definitely test it - I'm running 6-STABLE currently, but I >> suppose I could get -CURRENT on there for the testing.. > > FYI, Jeff Roberson just did a large scale merge of > UFS/VFS/snapshot/... bug fixes from HEAD to RELENG_6, see my HEADS UP > post on -stable a day or so ago. It would be very useful to know if > these help, and if not, you may want to drop e-mail to Jeff Roberson > with a detailed description, since he's actively working on tracking > down and fixing these issues. > > Robert N M Watson Well, updating to the latest RELENG_6, I see that progress is definitely being made. I don't seem to be deadlocked anymore. Commands like ls and such work fine, until I ls the snapshot file itself, which blocked for about 10 minutes before finally completing, and once that command blocked (ufs) other ls -al commands blocked (ufs) on the root (/) directory and subsequent subdirs down to the snapshot. A 'sync' also blocked during this time (blkrd?), but the difference this time is that they all completed. The snapshot completed within about 22 minutes (2Tb filesystem, very little on this one), and commands returned before the snapshot finished at about the 10 minute mark, and subsequent commands (again, ls -al, etc), completed when the snapshot completed. The machine in question is a dual Xeon 2.8GHz with 4Gb of memory, running SMP kernel (pretty much GENERIC), and was about 30% busy (cpu) mostly 'system' and 'io'. The disk being snapshotted was very busy though.. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------