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List:       freebsd-hackers
Subject:    gpart difficulties
From:       Christopher Bowman <crb () chrisbowman ! com>
Date:       2017-10-15 22:35:02
Message-ID: 8C14AA5A-FD78-4A83-8640-B6FE2D41EAA1 () chrisbowman ! com
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I have a home server with a fairly large amount of zfs disk space where I keep all of \
my persistent data.  As a result when new releases of FreeBSD come out I tend backup \
the root images of my machines to the zfs pool and, starting with the least important \
box, I blow away all the local partitions and reinstall from scratch.  Then I mount \
the server zfspool and restore config files and packages.  As a result my machines \
stay pretty up to date and clean.  Lately rather than burning DVDs I've decided that \
I will create a usb boot disks containing the entire DVD contents and simply go down \
the line and and install on one machine after the other.  My machine can now all boot \
off USB but don't all have DVD drives.

I have the following script below which I was using to try configure an MBR bootable \
memory stick.  The commented out lines are a reminder to myself of how to copy over \
the ISO contents to the slice I create (I only do this when there is a new release so \
I forget.)

gpart create -s MBR da0
gpart add -i 1 -t freebsd da0
gpart set -a active -i 1 da0
gpart bootcode -b /boot/mbr da0
gpart create -s BSD -n 8 da0s1
gpart add -t freebsd-ufs -i 1 da0s1
gpart bootcode -p /boot/boot -i 1 da0s1
# newfs da0s1a
# mount /dev/da0s1a /mnt/usb
# mdconfig -a -t vnode -f /u1/ISOs/FreeBSD/11.1/FreeBSD-11.1-RELEASE-amd64-dvd1.iso
# mount -t cd9660 /dev/md0 /mnt/dvd
# cp -pr /mnt/dvd/* /mnt/usb
# umount /mnt/usb

What I've found that's interesting is that the slice creation doesn't seem to be \
persistent.  By that I mean that if I run the above script (included the commented \
stuff.)  I can clearly see the /mnt/usb contents are the same as the DVD.  If I then \
unmount /mnt/usb and remove the stick when I put it back in gpart show doesn't seems \
to show the BSD label, just the MBR slice

If I reinsert and do the following:
gpart create -s BSD -n 8 da0s1
gpart add -t freebsd-ufs -i 1 da0s1
gpart bootcode -p /boot/boot -i 1 da0s1
fsck /dev/da0s1a
mount /dev/da0s1a /mnt/usb

Then the file system is there just as before.  The slice creation doesn't seem \
persistent.  Am I missing something?  Is there something I have to do to commit the \
slice?  Is this a bug?

I appreciate your help.

Christopher

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