Migrating FreeBsd installation to another hard drive
Ruben Bloemgarten
ruben at bloemgarten.demon.nl
Thu Jul 7 16:26:14 GMT 2005
That would be "# fdisk -BI /dev/ar0" "B" for bootable.
The FBSD boot manager is on slice *a which is left intact when using dump.
The reason I went to an intermediate drive is . . . I only had two slots
available on SATA backpane.
Oh and check out
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/boot-blocks.html
Good luck,
Ruben
-----Original Message-----
From: Chris Roos [mailto:chris at seagul.co.uk]
Sent: July 07, 2005 5:13 PM
To: ruben at bloemgarten.demon.nl
Cc: freebsd-questions at freebsd.org
Subject: Re: Migrating FreeBsd installation to another hard drive
Thanks for the time taken to detail all of the steps. I think I am
doing roughly the same thing except you are going via from _source_ to
_intemediary_ back to _source_ once the RAID is sorted. I am going
straight from _source_ to _destination_.
I may be wrong but do any of your steps below involve writing the
standard mbr (not the freebsd boot manager) to the drive?
Thanks for your help,
Chris
Ruben Bloemgarten wrote:
> 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 ar0s1
> 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 at freebsd.org
> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Chris Roos
> Sent: July 06, 2005 6:11 PM
> To: freebsd-questions at 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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