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Date:      Thu, 22 Mar 2018 08:26:21 +0700
From:      Victor Sudakov <vas@mpeks.tomsk.su>
To:        Warren Block <wblock@wonkity.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Solved. Re: Dualboot and ZFS
Message-ID:  <20180322012621.GA15678@admin.sibptus.transneft.ru>
In-Reply-To: <alpine.BSF.2.21.1803210626040.85475@wonkity.com>
References:  <VI1PR02MB1200C7F0066F361E60A6CBEDF6EB0@VI1PR02MB1200.eurprd02.prod.outlook.com> <20180115144747.GA65526@admin.sibptus.transneft.ru> <VI1PR02MB120018D174817F8FFB2981D5F6EB0@VI1PR02MB1200.eurprd02.prod.outlook.com> <20180115151526.GA66342@admin.sibptus.transneft.ru> <a7920f859b666cff48f4f73ee1b2f954@dweimer.net> <20180116034929.GB89443@admin.sibptus.transneft.ru> <20180131082738.GA46395@admin.sibptus.transneft.ru> <547e65d16ef16667f61d88463ca73079@roundcube.fjl.org.uk> <20180319025914.GA57490@admin.sibptus.transneft.ru> <alpine.BSF.2.21.1803210626040.85475@wonkity.com>

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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



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