From owner-freebsd-fs@FreeBSD.ORG Thu Mar 23 21:16:51 2006 Return-Path: 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 1248A16A423 for ; Thu, 23 Mar 2006 21:16:51 +0000 (UTC) (envelope-from julien.gabel@thilelli.net) Received: from smtp.thilelli.net (smtp.thilelli.net [62.212.120.94]) by mx1.FreeBSD.org (Postfix) with ESMTP id 05E5743D4C for ; Thu, 23 Mar 2006 21:16:49 +0000 (GMT) (envelope-from julien.gabel@thilelli.net) Received: from localhost (localhost [127.0.0.1]) by bento.thilelli.net (Postfix) with ESMTP id 842A02E061; Thu, 23 Mar 2006 22:16:48 +0100 (CET) Received: from bento.thilelli.net ([127.0.0.1]) by localhost (bento.thilelli.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 50613-05; Thu, 23 Mar 2006 22:16:47 +0100 (CET) Received: from webmail.thilelli.net (localhost [127.0.0.1]) by bento.thilelli.net (Postfix) with ESMTP id 680122E00D; Thu, 23 Mar 2006 22:16:47 +0100 (CET) Received: from 192.168.1.101 (SquirrelMail authenticated user jgabel) by webmail.thilelli.net with HTTP; Thu, 23 Mar 2006 22:16:47 +0100 (CET) Message-ID: <50319.192.168.1.101.1143148607.squirrel@webmail.thilelli.net> In-Reply-To: <007801c64eb9$3db4c050$1b12c055@genie> References: <20060322120033.E5B8916A44B@hub.freebsd.org> <007801c64eb9$3db4c050$1b12c055@genie> Date: Thu, 23 Mar 2006 22:16:47 +0100 (CET) From: "Julien Gabel" To: "Eugene" User-Agent: SquirrelMail/1.4.6 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-Virus-Scanned: amavisd-new at thilelli.net Cc: freebsd-fs@freebsd.org, Kris Kennaway Subject: Re: UFS2 Snapshots in 6.1-Beta4 - Confirmed Problems. X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 Mar 2006 21:16:51 -0000 > While we're on the topic of snapshots, I recently posted this follow-up to > the PR kern/66270 "[hang] dump causes machine freeze" >> I wonder what is the status of this PR? >> I seem to have the same problem with 5.3-RELEASE. >> >> Before this started, system worked nicely for more than a year and then >> it >> started to hang during dump (seemingly just after mksnap_ffs) first >> intermittently and now reproducibly (might increase in data size be a >> factor? though disk is only about 18% full). >> Originally it hanged and console had complains about increasing >> PMAP_SHPGPERPROC and maxproc. >> After some talk in freebsd-fs, I adjusted these parameters and now it >> just hangs without complaining =(( >> >> Any suggestions? > In addition to this PR, I found a couple of similar threads in different > lists but they all just have some initial talk and preliminary analysis, > and then it just stops. Was that snapshot problem fixed or is it the same > as we are talking now? I can't believe I am the only one in almost 2 > years who is (trying to be) doing automated backups... > So, if it was fixed, when (which version)? If not, then when it might be > and -- in the meantime -- is there any workaround for backups? (The system > is the production server on the colocation so doing backups in single-user > mode is not practical). Interesting. I used dump/restore without problem on i386 using a file system of 120Go. I swiched two weeks ago on amd64 using a file system of 260Go and encountered the very same behaviour (hang, freeze). Don't know if it is related to the new processor architecture or the bigger fs size, but i didn't observe this hang on smallest file system before. Because i am a big fan of dump, i currently choose to use it without the '-L' switch, back to the old (classical?) behaviour, i.e. not doing a snapshot before doing the dump. It is always better than not having complete system backup at all (YMMV, though). I am currently running 6.1-PRERELEASE build Wed Mar 22 03:55:42 CET 2006. -- -jpeg.