Date: Wed, 6 Jul 2005 19:07:36 +0200 From: "Ruben Bloemgarten" <ruben@bloemgarten.demon.nl> To: "'Chris Roos'" <chris@seagul.co.uk>, <freebsd-questions@freebsd.org> Subject: RE: Migrating FreeBsd installation to another hard drive Message-ID: <20050706170753.4D6F543D46@mx1.FreeBSD.org> In-Reply-To: <42CC027B.7030808@seagul.co.uk>
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Hi there,
I had to do something similar i.e. change RAID levels, there is no need to
install anything. Just use the fixit CD. Here is my procedure :
Ofcourse you'll have to change disk[slice] names to what suits you. NOTE: I
used tar for the /usr slice as I had some size constraints and therefore
needed some compression ( I could have piped the dump to gzip ofcourse, but
didn't). In my opinion dump&restore is the best procedure. But dd works as
well.
Regards,
Ruben
1. boot from CD
2. goto fixit CD
3. create new mount point
--> # mkdir /new_mnt
4. mount external drive /new_mnt
--> # mount /dev/da0s1 /new_mnt
5. mount / on /mnt
# mount /dev/ar0s1a /mnt
6. backup fstab and bsdlabel
--> # cp /mnt/etc/fstab /new_mnt/fstab.BAK
# bsdlabel ar0s1 > /new_mnt/bsdlabel.BAK
7. dump /
--> # umount /mnt
# dump -0au -C 32 -f /new_mnt/root_dump /dev/ar0s1a
8. dump /var
--> # dump -0au -C 32 -f /new_mnt/var_dump /dev/ar0s1e
9. tar /usr ( or only those subsystems which contain userdata
(dbase,mail,etc)
--> # mount /dev/ar0s1f /mnt
# cd /mnt
# tar czf /new_mnt/usr_tar.tar.gz ./
10.unmount all mounted filesystems
--> # umount /mnt
# umount /new_mnt
11. exit fixit and boot CD
12. power down
13. replace disks
14. boot to RAID config tool
15. set array to RAID0
16. reboot to CD
17. exit to FIXIT
18. erase current disklabel & create new label with one slice
--> # dd if=/dev/zero of=/dev/ar0 bs=512 count=32
# fdisk -BI /dev/ar0
# dd if=/dev/zero of=/dev/ar0s1 bs=512 count=32
# bsdlabel -w -B da0s1
19. read disklabel & note c partition value
20. mount external disk & edit saved slice (step 6)
21. write edited label to disk
22. --> # bsdlabel -R /dev/ar0s1 /new_mnt
23. --> # newfs /dev/ar0s1[a,d,e,f)
24. --> # mount /dev/ar0s1d /tmp
25. --> # export TMPDIR=/tmp
26. mount & restore /
--> # mount /dev/ar0s1a /mnt
# cd /mnt
# restore rf [PATHNAME_TO_root_dump]
27. umounting / and mount & restore /var
--> # cd ..
# umount /mnt
# mount /dev/ar0s1e /mnt
# cd /mnt
# restore rf [PATHNAME_TO_var_dump]
28. extracting usr_tar.tar.gz into /usr
--> # cd ..
# umount /mnt
# mount /dev/ar0s1f /mnt
# cd /mnt
# tar xzvf [PATHNAME_TO_usrtar] ./
29. umount all open filesystems
--> # umount /tmp
# umount /mnt
# umount /new_mnt
30. exit single user mode and startup
-----Original Message-----
From: owner-freebsd-questions@freebsd.org
[mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Chris Roos
Sent: July 06, 2005 6:11 PM
To: freebsd-questions@freebsd.org
Subject: Migrating FreeBsd installation to another hard drive
Hi,
I've recently had the job of moving a FreeBsd installation to another
hard drive.
After quite a lot of reading I got round to following this article[1]
using a VMWare FreeBsd instance. In brief the article uses dump and
restore to move the data from one mounted partition to another in single
user mode. It also suggests that before you do this, you perform a
minimum install on the destination disk to ensure that it boots fine.
First time round, I did the minimum install and then followed the steps
(minus the MAKEDEV step as I'm running 5.3R) to backup the data to the
destination. This all worked fine.
Second time round, I didn't do a minimum install, rather I just set-up
the slice and partitions on the destination using sysinstall, and then
did the dump/restore. On booting from the destination disk this time,
nothing happened. I reasoned that it was because I had no boot manager
installed and so went ahead and used boot0cfg -B to install the FreeBsd
boot manager. The disk now boots; however, I would prefer to use the
equivalent of the 'Standard - Install a standard MBR (no boot manager)'
option from sysinstall as FreeBsd is the only OS on the disk and so I
don't need the option of booting to it or anything else. I'm guessing
that I would use fdisk to do this but if so am not entirely sure how.
In addition, is this safe to perform on a disk with data or would I need
to go through the dump/restore process again?
One final question is whether the dump/restore process is the best
approach in this instance? I have read about using dd but am not
entirely sure whether this would do what I need?
Thanks in advance for any help,
Chris
[1] http://bsdvault.net/sections.php?op=viewarticle&artid=121
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