From owner-freebsd-questions@freebsd.org Thu Mar 22 01:26:31 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 07C42F57205 for ; Thu, 22 Mar 2018 01:26:31 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) Received: from relay2.tomsk.ru (mail.sibptus.tomsk.ru [212.73.124.5]) by mx1.freebsd.org (Postfix) with ESMTP id 535ED74487 for ; Thu, 22 Mar 2018 01:26:29 +0000 (UTC) (envelope-from vas@mpeks.tomsk.su) X-Virus-Scanned: by clamd daemon 0.98.5_1 for FreeBSD at relay2.tomsk.ru Received: from [212.73.125.240] (HELO admin.sibptus.transneft.ru) by relay2.tomsk.ru (CommuniGate Pro SMTP 5.1.16) with ESMTPS id 39961022; Thu, 22 Mar 2018 07:21:34 +0600 Received: from admin.sibptus.transneft.ru (sudakov@localhost [127.0.0.1]) by admin.sibptus.transneft.ru (8.15.2/8.15.2) with ESMTP id w2M1QOrG015967; Thu, 22 Mar 2018 08:26:26 +0700 (+07) (envelope-from vas@mpeks.tomsk.su) Received: (from sudakov@localhost) by admin.sibptus.transneft.ru (8.15.2/8.15.2/Submit) id w2M1QLpN015965; Thu, 22 Mar 2018 08:26:21 +0700 (+07) (envelope-from vas@mpeks.tomsk.su) X-Authentication-Warning: admin.sibptus.transneft.ru: sudakov set sender to vas@mpeks.tomsk.su using -f Date: Thu, 22 Mar 2018 08:26:21 +0700 From: Victor Sudakov To: Warren Block Cc: freebsd-questions@freebsd.org Subject: Re: Solved. Re: Dualboot and ZFS Message-ID: <20180322012621.GA15678@admin.sibptus.transneft.ru> References: <20180115144747.GA65526@admin.sibptus.transneft.ru> <20180115151526.GA66342@admin.sibptus.transneft.ru> <20180116034929.GB89443@admin.sibptus.transneft.ru> <20180131082738.GA46395@admin.sibptus.transneft.ru> <547e65d16ef16667f61d88463ca73079@roundcube.fjl.org.uk> <20180319025914.GA57490@admin.sibptus.transneft.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: AO "Svyaztransneft", SibPTUS X-PGP-Key: http://www.dreamwidth.org/pubkey?user=victor_sudakov X-PGP-Fingerprint: 10E3 1171 1273 E007 C2E9 3532 0DA4 F259 9B5E C634 User-Agent: Mutt/1.9.3 (2018-01-21) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Mar 2018 01:26:31 -0000 Warren Block wrote: > On Mon, 19 Mar 2018, Victor Sudakov wrote: > > > > sysctl kern.geom.debugflags=0x10 > > Please reconsider doing this without it being required. It means "allow > destroying mounted partitions" and is usually not necessary. It is recommended, or even required ("must") by the zfsboot(8) man page: EXAMPLES zfsboot is typically installed using dd(1). To install zfsboot on the ada0 drive: dd if=/boot/zfsboot of=/dev/ada0 count=1 dd if=/boot/zfsboot of=/dev/ada0 iseek=1 oseek=1024 If the drive is currently in use, the GEOM safety will prevent writes and must be disabled before running the above commands: sysctl kern.geom.debugflags=0x10 zfsboot can also be installed in an MBR slice: gpart create -s mbr ada0 gpart add -t freebsd ada0 gpart create -s BSD ada0s1 gpart bootcode -b /boot/boot0 ada0 gpart set -a active -i 1 ada0 dd if=/boot/zfsboot of=/dev/ada0s1 count=1 dd if=/boot/zfsboot of=/dev/ada0s1 iseek=1 oseek=1024 -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN AS43859