Date: Tue, 17 Oct 2017 00:24:43 -0700 From: Christopher Bowman <crb@chrisbowman.com> To: =?utf-8?Q?Roberto_Fern=C3=A1ndez?= <roberfern@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: apart difficulties Message-ID: <212A072E-D083-4622-BCF0-9C2FD88BE396@chrisbowman.com> In-Reply-To: <CAJD3LUf6hOevrzbRmbEvO8_Vj%2BL4E5R9%2B1KCK1ppvtvxKOMK_w@mail.gmail.com> References: <FE9D0D6E-7107-4CAE-95D3-43A07E79DA61@chrisbowman.com> <CAJD3LUf6hOevrzbRmbEvO8_Vj%2BL4E5R9%2B1KCK1ppvtvxKOMK_w@mail.gmail.com>
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Roberto, I=E2=80=99m not sure all my machines can boot a gpt partition so = I wanted the least common denominator. I have a handful of these cheap = small flash sticks that I intend to use for various version and there = isn=E2=80=99t really a benefit to gpt (except that it might actually = work). I would look into the code but I haven=E2=80=99t a clue where = that would be and I figured someone else might be more of an expert in = this area and could find it faster. Thanks for the comments and the gpt suggestion, I may actually = try that. Christopher > On Oct 17, 2017, at 12:02 AM, Roberto Fern=C3=A1ndez = <roberfern@gmail.com> wrote: >=20 > Hi Cristopher, >=20 > before starting I was wandering why have you chose a MBR partitioning > scheme instead of a GPT one, but never the less, I will try to help > you with that. >=20 > 2017-10-17 6:13 GMT+02:00 Christopher Bowman <crb@chrisbowman.com = <mailto:crb@chrisbowman.com>>: >> 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=E2=80=99ve 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=E2=80=99t all have DVD drives. >>=20 >> 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.) >>=20 >> 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 >=20 > If you do here the following (instead of what you did above) should > work just fine: > gpart create -s GPT da0 > gpart add -i1 -s 256k -t freebsd-boot -b 40 da0 > gpart add -i2 -t freebsd-ufs da0 > gpart bootcode -b /boot/pmbr -p /boot/gptboot -i1 da0 >=20 > If you insist in having a BSD partitioning inside a MBR one, I should > took a deeper look into the code and analyze why it is not working as > it should. >=20 >> # 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 >>=20 >> What I=E2=80=99ve found that=E2=80=99s interesting is that the slice = creation doesn=E2=80=99t 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=E2=80= =99t seems to show the BSD label, just the MBR slice >>=20 >> 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 >>=20 >> Then the file system is there just as before. The slice creation = doesn=E2=80=99t seem persistent. Am I missing something? Is there = something I have to do to commit the slice? Is this a bug? >>=20 >> I appreciate your help. >>=20 >> Christopher >> _______________________________________________ >> freebsd-hackers@freebsd.org <mailto:freebsd-hackers@freebsd.org> = mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-hackers = <https://lists.freebsd.org/mailman/listinfo/freebsd-hackers>; >> To unsubscribe, send any mail to = "freebsd-hackers-unsubscribe@freebsd.org = <mailto:freebsd-hackers-unsubscribe@freebsd.org>"
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