ZFS: amd64, devd, root file system.
Pawel Jakub Dawidek
pjd at FreeBSD.org
Mon Apr 9 09:43:35 UTC 2007
On Mon, Apr 09, 2007 at 03:17:23AM +0200, Pawel Jakub Dawidek wrote:
> 3. It is now possible to have root file system on ZFS. You would still
> need UFS for your /boot/ file system.
Let me explain how this suppose to work.
You have ad0 disk. Create one slice covering entire disk:
# fdisk -BI /dev/ad0
# bsdlabel -wB /dev/ad0s1
Edit your label and create small (like 256MB-512MB) 'a' partition and
use the rest for 'd' partition:
# bsdlabel -e /dev/ad0s1
'd' partition will be used for ZFS:
# zpool create tank ad0s1d
Create UFS file system on /dev/ad0s1a and copy /boot/ directory in
# newfs /dev/ad0s1a
# mount /dev/ad0s1a /mnt/tmp
# cp -Rp /boot/* /mnt/tmp/
Note that there is no /boot/ directory on ad0s1a yet. This is one of the
two possibilities. You now need to create symlink:
# cd /mnt/tmp
# ln -s . boot
From what I checked our loader should handle symlinks just fine.
This will allow us to mount /dev/ad0s1a on /boot directory and use it as
Another option is to:
# cp -Rp /boot /mnt/tmp/
and in the future mount /dev/ad0s1a on eg. /bootdisk and create symlink:
# ln -s bootdisk/boot /boot
All in all, you should see your kernel when you do:
# ls -l /mnt/tmp/boot/kernel
Now don't forget to add zfs_load="YES" to /mnt/tmp/boot/loader.conf.
Ok, you also need to tell your loader where your root file system is.
You can do it by adding:
to /mnt/tmp/boot/loader.conf or you can create /mnt/tmp/etc/fstab file
with one entry only:
tank / zfs rw 0 0
On your ZFS file system, your /etc/fstab should contains the line above
/dev/ad0s1a /boot ufs rw 0 0
(and everything else, ie. your swap and other file systems)
Pawel Jakub Dawidek http://www.wheel.pl
pjd at FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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