[gentoo-user] plain copy of root disk won't work

[gentoo-user] plain copy of root disk won't work

[Raffaele BELARDI]

I want to move the main disk contents (hda, PATA) to another, larger 
disk (sda, SATA).

hda contains 4 ext3 partitions (root, home, data, swap).
I created 4 ext3 partitions on sda and copied the data over from the 
corresponding hda partitions using 'cp -ax'.
Then I chroot into sda1, 'grub-install /dev/sda', grub-mkconfig and edit 
fstab to use sda instead of hda.
Reboot, from the non-UEFI bios change the disk boot order and try to 
boot from sda.
grub from the sda starts, loads the kernel from sda1, the kernel finds 
the root file system and mounts it RO but then the process stops at the 
end of the kernel boot. No kernel panic, just hangs there with the last 
kernel message before openrc. Openrc is not started.

What might I be missing?

thanks,

raffaele

Re: [gentoo-user] plain copy of root disk won't work

[Canek Peláez Valdés]

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On Fri, Nov 18, 2016 at 9:30 AM, Raffaele BELARDI <raffaele.belardi@st.com>
wrote:
>
> I want to move the main disk contents (hda, PATA) to another, larger
> disk (sda, SATA).
>
> hda contains 4 ext3 partitions (root, home, data, swap).
> I created 4 ext3 partitions on sda and copied the data over from the
> corresponding hda partitions using 'cp -ax'.
> Then I chroot into sda1, 'grub-install /dev/sda', grub-mkconfig and edit
> fstab to use sda instead of hda.
> Reboot, from the non-UEFI bios change the disk boot order and try to
> boot from sda.
> grub from the sda starts, loads the kernel from sda1, the kernel finds
> the root file system and mounts it RO but then the process stops at the
> end of the kernel boot. No kernel panic, just hangs there with the last
> kernel message before openrc. Openrc is not started.
>
> What might I be missing?

Perhaps some permissions and special files. I would use rsync for such a
task:

rsync -Pvas /source/directory/ /target/directory/

I've used that commend in the past for exactly the same motives as you. It
works; also, it's faster I think.

Regards.
--
Dr. Canek Peláez Valdés
Profesor de Carrera Asociado C
Departamento de Matemáticas
Facultad de Ciencias
Universidad Nacional Autónoma de México

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Re: [gentoo-user] plain copy of root disk won't work

[Константин]

On Fri, Nov 18, 2016 at 04:30:28PM +0100, Raffaele BELARDI wrote:
> I want to move the main disk contents (hda, PATA) to another, larger
> disk (sda, SATA).
>
> hda contains 4 ext3 partitions (root, home, data, swap).
> I created 4 ext3 partitions on sda and copied the data over from the
> corresponding hda partitions using 'cp -ax'.

Didn't you do this from working system on hda? In this case there
really could be troubles with special files etc. Imho live-cd better
for this purpose.

At any case imho it's better to split this task

0. Boot from live-cd.
1. Copy partitions from hda to sda (cp or rsync)
2. Edit fstab on sda.
3. Configure grub on HDA to see hda and sda systems,
4. Try to boot sda.
5. If all is good, configure grub on sda, and change BIOS boot order.

As Canek wrote rsync is great for this task, but beware - last '/' in
'/source/directory/' means!

#kstn

Re: [gentoo-user] plain copy of root disk won't work

[Fernando Rodriguez]

On Fri, Nov 18, 2016 at 04:30:28PM +0100, Raffaele BELARDI wrote:
> I want to move the main disk contents (hda, PATA) to another, larger 
> disk (sda, SATA).
> 
> hda contains 4 ext3 partitions (root, home, data, swap).
> I created 4 ext3 partitions on sda and copied the data over from the 
> corresponding hda partitions using 'cp -ax'.
> Then I chroot into sda1, 'grub-install /dev/sda', grub-mkconfig and edit 
> fstab to use sda instead of hda.
> Reboot, from the non-UEFI bios change the disk boot order and try to 
> boot from sda.

Do you have a reference to your root partition on /etc/default/grub that
you forgot to update before running grub-mkconfig?


> grub from the sda starts, loads the kernel from sda1, the kernel finds 
> the root file system and mounts it RO but then the process stops at the 
> end of the kernel boot. No kernel panic, just hangs there with the last 
> kernel message before openrc. Openrc is not started.
> 
> What might I be missing?
> 
> thanks,
> 
> raffaele

-- 
Fernando Rodriguez

Re: [gentoo-user] plain copy of root disk won't work

[Frank Steinmetzger]

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On Fri, Nov 18, 2016 at 10:20:13PM +0300, Константин wrote:
> On Fri, Nov 18, 2016 at 04:30:28PM +0100, Raffaele BELARDI wrote:
> > I want to move the main disk contents (hda, PATA) to another, larger
> > disk (sda, SATA).
> >
> > hda contains 4 ext3 partitions (root, home, data, swap).
> > I created 4 ext3 partitions on sda and copied the data over from the
> > corresponding hda partitions using 'cp -ax'.
> 
> Didn't you do this from working system on hda? In this case there
> really could be troubles with special files etc. Imho live-cd better
> for this purpose.
> 
> At any case imho it's better to split this task
> 
> 0. Boot from live-cd.

If I can’t be bothered with live CDs, I bind-mount the root partition. I use
that frequently to do root-backups. That way you can get the files within
/dev which are required even before /dev is populated (null and zero, IIRC).
This will, of course, not prevent files from being changed during the rsync
run, because the system is still live and kicking. So I usually run it
several times to see what has changed in the meantime.

mkdir /mnt/bindroot
mount --bind / /mnt/bindroot
rsync -ahXAHi --delete /mnt/bindroot/ /path/to/new/partition/

Since this is a bindmount, no need for -x. Use -A and -X if you use acls and
xattrs, respectively. But you definitely want -H. For example git installs
all its commands as hardlinks to a single binary.

-- 
Gruß | Greetings | Qapla’
Please do not share anything from, with or about me with any social network.

Idealism grows with the distance to the problem.

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Re: [gentoo-user] plain copy of root disk won't work - SOLVED

[Raffaele BELARDI]

Константин wrote:
> On Fri, Nov 18, 2016 at 04:30:28PM +0100, Raffaele BELARDI wrote:
>> I want to move the main disk contents (hda, PATA) to another, larger
>> disk (sda, SATA).
>>
>> hda contains 4 ext3 partitions (root, home, data, swap).
>> I created 4 ext3 partitions on sda and copied the data over from the
>> corresponding hda partitions using 'cp -ax'.
>
> Didn't you do this from working system on hda? In this case there
> really could be troubles with special files etc. Imho live-cd better
> for this purpose.
>

Yes, I was working from a live system. Using rsync and booting from live 
CD did the trick.

thanks,

raffaele