Date: Wed, 5 Nov 2014 12:13:53 +0100 (CET) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> To: Arthur Chance <freebsd@qeng-ho.org> Cc: freeBSD-Questions <freebsd-questions@freebsd.org> Subject: Re: zpool component names - gpt vs. gptid Message-ID: <alpine.BSF.2.11.1411051159030.1380@mail.fig.ol.no> In-Reply-To: <545A0067.1090005@qeng-ho.org> References: <5459E89F.7080801@qeng-ho.org> <alpine.BSF.2.11.1411051026360.1376@mail.fig.ol.no> <545A0067.1090005@qeng-ho.org>
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On Wed, 5 Nov 2014 10:48-0000, Arthur Chance wrote: > On 05/11/2014 09:27, Trond Endrestøl wrote: > > On Wed, 5 Nov 2014 09:06-0000, Arthur Chance wrote: > > > > > These days I use GPT labelled partitions (/dev/gpt/<label>) exclusively > > > when > > > creating zfs pools. However, on my latest box, where I have two pools each > > > with a single component, "zpool status" lists the components as > > > gptid/<uuid> > > > rather than gpt/<label> > > > > > > Is there any way to persuade zfs/zpool to use the GPT label devices rather > > > than the gptid devices? Failing that, how do you map gptid's back to the > > > underlying disk partitions? It's obvious in this case, but I'm building a > > > new > > > file server with eight identical disks in a raidz2 set up and am worried > > > how > > > I'll identify which disk has problems in the future. > > > > Look at: zpool import -d /dev/gpt some-zpool > > > > I tried that before (after exporting the zpool of course) and it failed. > Looking a bit harder, the /dev/gpt device had ceased to exist because the > corresponding /dev/gptid device was active. Retasting the disk brought the gpt > dive back, and importing with -d worked for one zpool. However, the other has > root on it and I'd have to do it from a live memory stick. > > However, none of this explains why zpool was using the gptid disks - I'd > created the pools using gpt labelled disks and that got lost over some reboot, > and I'd like to stop that happening again. The problem is that I don't know > why it happened. I recently started using boot environments in order to switch > from 10.1-RC3 to -RC4, but I'm not sure if that's connected - /boot and the > zfs cache are within the b.e. and should have been copied over. Hmm, I don't believe the cache file is used much these days, unless you: 1. Re-import all your zpools from a live memory stick: zpool import -d /dev/gpt -o cachefile=/tmp/zpool.cache zpool1 zpool import -d /dev/gpt -o cachefile=/tmp/zpool.cache zpool2 2. Copy /tmp/zpool.cache to your b.e.'s /boot/zfs/zpool.cache while still running from the live memory stick. 3. Enable the kernel to consult /boot/zfs/zpool.cache by having these three lines in /boot/loader.conf: zpool_cache_load="YES" zpool_cache_type="/boot/zfs/zpool.cache" zpool_cache_name="/boot/zfs/zpool.cache" -- +-------------------------------+------------------------------------+ | Vennlig hilsen, | Best regards, | | Trond Endrestøl, | Trond Endrestøl, | | IT-ansvarlig, | System administrator, | | Fagskolen Innlandet, | Gjøvik Technical College, Norway, | | tlf. mob. 952 62 567, | Cellular...: +47 952 62 567, | | sentralbord 61 14 54 00. | Switchboard: +47 61 14 54 00. | +-------------------------------+------------------------------------+ From owner-freebsd-questions@FreeBSD.ORG Wed Nov 5 14:27:05 2014 Return-Path: <owner-freebsd-questions@FreeBSD.ORG> Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 172C9C5E for <freebsd-questions@freebsd.org>; Wed, 5 Nov 2014 14:27:05 +0000 (UTC) Received: from mail-qc0-f172.google.com (mail-qc0-f172.google.com [209.85.216.172]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C8576177 for <freebsd-questions@freebsd.org>; Wed, 5 Nov 2014 14:27:04 +0000 (UTC) Received: by mail-qc0-f172.google.com with SMTP id i17so590485qcy.17 for <freebsd-questions@freebsd.org>; Wed, 05 Nov 2014 06:26:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=EKmtaNp9eBAnK4AggPLb0zHU9mZWT3YMMMA8o2qgkoE=; b=bLYXqNssGtnkDbKecBelTwmEPv7CkXUk2pdKG62wDgtoT/y4R+VZPrjulfGog3HFTT XfArvAC4q/iWyd545k2c17EJkkVoEiGKvpAJIlLhIaOGgb8aUGMrBUTg0yz6SFBGb/cT v3mLPyHKbCxI/kTdy861FhsKou/HdXen7XOoh4jRPucQjK6Ie6QT5xb1dPSXBLWo2Got j0diKJaTTVwV5auKkU846ZKpXB/ly2qdjX4xx+Qn6MbW34cyCKhZjsGOgsxyfAtf6Jo4 Y7emWJhyoIZ8ruL8HyyyBJOx9EeBxviP8mBaf4xv4Ewul3yqDaD9vC5G7P7p/1m6E9yJ JQOw== X-Gm-Message-State: ALoCoQno1baHpDDo73EmLjVII8pOSDvbQHZtsWBOWa9Ma2L9rfI4qT4l5S8XnRFo0G5LKK3GYJ+e X-Received: by 10.224.23.9 with SMTP id p9mr19981843qab.92.1415197125760; Wed, 05 Nov 2014 06:18:45 -0800 (PST) Received: from mbp-1.thecreativeadvantage.com (mail.thecreativeadvantage.com. [96.236.20.34]) by mx.google.com with ESMTPSA id z4sm3240765qal.6.2014.11.05.06.18.44 for <freebsd-questions@freebsd.org> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Nov 2014 06:18:45 -0800 (PST) Message-ID: <545A31C4.6010705@kraus-haus.org> Date: Wed, 05 Nov 2014 09:18:44 -0500 From: Paul Kraus <paul@kraus-haus.org> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Re: zpool component names - gpt vs. gptid References: <5459E89F.7080801@qeng-ho.org> In-Reply-To: <5459E89F.7080801@qeng-ho.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>; List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 05 Nov 2014 14:27:05 -0000 On 11/5/14 4:06, Arthur Chance wrote: > Is there any way to persuade zfs/zpool to use the GPT label devices > rather than the gptid devices? Failing that, how do you map gptid's back > to the underlying disk partitions? It's obvious in this case, but I'm > building a new file server with eight identical disks in a raidz2 set up > and am worried how I'll identify which disk has problems in the future. I have taken to putting a physical label on the outside of the disk bracket (I use hot or cold swap disk brackets) with the last four digits of the unique ID (usually based on drive S/N). I had managed lots of Fibre-Channel drives in a previous life and the _only_ drive ID there is the WWN, which better vendors included on the exterior mounting bracket. -- -- Paul Kraus paul@kraus-haus.org Co-Chair Albacon 2014.5 http://www.albacon.org/2014/
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