[gentoo-user] Moving linux system to another partition

[gentoo-user] Moving linux system to another partition

[Aleksey Kunitskiy]

Hi all,

Is it safe to move my linux system by using:
#>cp -rp /mnt/old_part /mnt/new_part
and approriate changes in grub.conf/fstab on new system location ?

-- 
best regards,
Aleksey V. Kunitskiy
-- 
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Re: [gentoo-user] Moving linux system to another partition

[Hemmann, Volker Armin]

On Freitag, 8. Juni 2007, Aleksey Kunitskiy wrote:
> Hi all,
>
> Is it safe to move my linux system by using:
> #>cp -rp /mnt/old_part /mnt/new_part
> and approriate changes in grub.conf/fstab on new system location ?

nope.

cp -a if you really want to use copy. But doesn't kill that the ctime/mtime 
making uninstalling things a pain?

When I moved around on harddisks some years ago, I followed some instructions 
found on the suse-hp. And they used tar.
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Re: [gentoo-user] Moving linux system to another partition

[Alan McKinnon]

On Friday 08 June 2007, Hemmann, Volker Armin wrote:
> On Freitag, 8. Juni 2007, Aleksey Kunitskiy wrote:
> > Hi all,
> >
> > Is it safe to move my linux system by using:
> > #>cp -rp /mnt/old_part /mnt/new_part
> > and approriate changes in grub.conf/fstab on new system location ?
>
> nope.
>
> cp -a if you really want to use copy. But doesn't kill that the
> ctime/mtime making uninstalling things a pain?

No.

cp -a is equivalent to cp -dpPR

and from the man page:

-p     same as --preserve=mode,ownership,timestamps

What the OP *will* have a problem with a copying /proc, /dev, /sys and 
other virtual filesystems. When I do this trick, I usually dd or tar or 
cp -a entire filesystems and then copy / with this trick:

mount -o bind / /some/tmp/dir
cp -a /some/tmp/dir /some/other/dir

This ensures that only files actually on-disk are copied

alan


-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Albert Hopkins]

On Fri, 2007-06-08 at 17:48 +0200, Alan McKinnon wrote:
> What the OP *will* have a problem with a copying /proc, /dev, /sys
> and 
> other virtual filesystems. When I do this trick, I usually dd or tar
> or 
> cp -a entire filesystems and then copy / with this trick:
> 
> mount -o bind / /some/tmp/dir
> cp -a /some/tmp/dir /some/other/dir
> 
> This ensures that only files actually on-disk are copied 

You could also pass, '-x' to cp and rsync or '--one-file-system' to tar.
 
--
Albert W. Hopkins

-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Aleksey Kunitskiy]

On Friday 08 June 2007 18:59, Albert Hopkins wrote:
> You could also pass, '-x' to cp and rsync or '--one-file-system' to tar.

Thanks. 

I found good howto [1], chapter #7 describes this problem

[1] http://www.tldp.org/HOWTO/Hard-Disk-Upgrade/

-- 
best regards,
Aleksey V. Kunitskiy
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Tim Allingham]

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On Fri, 2007-06-08 at 17:48 +0200, Alan McKinnon wrote:
> On Friday 08 June 2007, Hemmann, Volker Armin wrote:
> > On Freitag, 8. Juni 2007, Aleksey Kunitskiy wrote:
> > > Hi all,
> > >
> > > Is it safe to move my linux system by using:
> > > #>cp -rp /mnt/old_part /mnt/new_part
> > > and approriate changes in grub.conf/fstab on new system location ?
> >
> > nope.
> >
> > cp -a if you really want to use copy. But doesn't kill that the
> > ctime/mtime making uninstalling things a pain?
> 
> No.
> 
> cp -a is equivalent to cp -dpPR
> 
> and from the man page:
> 
> -p     same as --preserve=mode,ownership,timestamps
> 
> What the OP *will* have a problem with a copying /proc, /dev, /sys and 
> other virtual filesystems. When I do this trick, I usually dd or tar or 
> cp -a entire filesystems and then copy / with this trick:
> 
> mount -o bind / /some/tmp/dir
> cp -a /some/tmp/dir /some/other/dir
> 
> This ensures that only files actually on-disk are copied
> 
> alan
> 
> 
> -- 
> Optimists say the glass is half full,
> Pessimists say the glass is half empty,
> Developers say wtf is the glass twice as big as it needs to be?
> 
> Alan McKinnon
> alan at linuxholdings dot co dot za
> +27 82, double three seven, one nine three five

I generally prefer to do this with dd, from a remote environment

dd if=/dev/<source partition> of=/dev/<destination partition>

Tim Allingham
tim -at- datafirst-it.com.au

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Re: [gentoo-user] Moving linux system to another partition

[Hans-Werner Hilse]

Hi,

On Sat, 09 Jun 2007 02:43:23 +1000
Tim Allingham <deserted@westnet.com.au> wrote:

> I generally prefer to do this with dd, from a remote environment
> 
> dd if=/dev/<source partition> of=/dev/<destination partition>

"Remote Environment" probably means a) read-only mounted root FS or b)
a boot into another instance, e.g. a live-CD, right? If you're talking
about just SSH'ing into the machine: That will probably cause the copy
to be broken (if the machine has / still mounted r/w), at least an fsck
would be needed.

Also, this method will also need a bigger or equally sized new
partition. If it's bigger, one also needs to resize the filesystem
afterwards.

-hwh
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Re: [gentoo-user] Moving linux system to another partition

[Tim Allingham]

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On Fri, 2007-06-08 at 20:52 +0200, Hans-Werner Hilse wrote:
> Hi,
> 
> On Sat, 09 Jun 2007 02:43:23 +1000
> Tim Allingham <deserted@westnet.com.au> wrote:
> 
> > I generally prefer to do this with dd, from a remote environment
> > 
> > dd if=/dev/<source partition> of=/dev/<destination partition>
> 
> "Remote Environment" probably means a) read-only mounted root FS or b)
> a boot into another instance, e.g. a live-CD, right? If you're talking
> about just SSH'ing into the machine: That will probably cause the copy
> to be broken (if the machine has / still mounted r/w), at least an fsck
> would be needed.
> 
> Also, this method will also need a bigger or equally sized new
> partition. If it's bigger, one also needs to resize the filesystem
> afterwards.
> 
> -hwh

yeah that probably wasn't the best terminology to use, I was referring
to liveCD/alternate OS as opposed to remote access

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Re: [gentoo-user] Moving linux system to another partition

[Mick]

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On Friday 08 June 2007 19:52, Hans-Werner Hilse wrote:
> Hi,
>
> On Sat, 09 Jun 2007 02:43:23 +1000
>
> Tim Allingham <deserted@westnet.com.au> wrote:
> > I generally prefer to do this with dd, from a remote environment
> >
> > dd if=/dev/<source partition> of=/dev/<destination partition>
>
> "Remote Environment" probably means a) read-only mounted root FS or b)
> a boot into another instance, e.g. a live-CD, right? If you're talking
> about just SSH'ing into the machine: That will probably cause the copy
> to be broken (if the machine has / still mounted r/w), at least an fsck
> would be needed.
>
> Also, this method will also need a bigger or equally sized new
> partition. If it's bigger, one also needs to resize the filesystem
> afterwards.

How do you resize the fs? I was never comfortable trying this at home... but I 
have a feeling I might need to use it sooner or later.
-- 
Regards,
Mick

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Re: [gentoo-user] Moving linux system to another partition

[Hans-Werner Hilse]

Hi,

On Mon, 11 Jun 2007 08:24:00 +0100 Mick <michaelkintzios@gmail.com>
wrote:

> On Friday 08 June 2007 19:52, Hans-Werner Hilse wrote:
>
> > Also, this method will also need a bigger or equally sized new
> > partition. If it's bigger, one also needs to resize the filesystem
> > afterwards.
> 
> How do you resize the fs? I was never comfortable trying this at
> home... but I have a feeling I might need to use it sooner or later.

This is file system specific. There's e.g. resize2fs, xfs_growfs and
other programs for the other FS. Of course, there's no need to grow the
filesystem, but you won't have more space than before because file
systems don't usually adapt to partition size.

-hwh
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Re: [gentoo-user] Moving linux system to another partition

[Randy Barlow]

Hans-Werner Hilse wrote:
> Of course, there's no need to grow the
> filesystem, but you won't have more space than before because file
> systems don't usually adapt to partition size.

I am confused as to what you mean here.  It is my experience that
resizing a file system that has been dd'ed to a new, larger partition
will cause it to take up that entire new partition (which is desirable).
   Are you saying this is not the case?

R
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Alan McKinnon]

On Monday 11 June 2007, Randy Barlow wrote:
> Hans-Werner Hilse wrote:
> > Of course, there's no need to grow the
> > filesystem, but you won't have more space than before because file
> > systems don't usually adapt to partition size.
>
> I am confused as to what you mean here.  It is my experience that
> resizing a file system that has been dd'ed to a new, larger partition
> will cause it to take up that entire new partition (which is
> desirable). Are you saying this is not the case?

No, he's saying that you don't *have* to resize the fs, but then all 
that happens is you have a (say) 60GB fs on a 100GB partition, wasting 
40GB of disk space. He also say it would be nice to have an fs that 
dynamically resizes itself if it finds it's not using all of the 
partition, but that's not the usual way it works (if at all).

Hans-Werner's post is correct but also in convulted language with a 
triple negative. Your original understanding is correct.

alan

-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Hans-Werner Hilse]

Hi,

On Mon, 11 Jun 2007 10:18:27 -0500 Randy Barlow
<randy@electronsweatshop.com> wrote:

> Hans-Werner Hilse wrote:
> > Of course, there's no need to grow the
> > filesystem, but you won't have more space than before because file
> > systems don't usually adapt to partition size.
> 
> I am confused as to what you mean here.  It is my experience that
> resizing a file system that has been dd'ed to a new, larger partition
> will cause it to take up that entire new partition (which is
> desirable). Are you saying this is not the case?

Nope, I was merely saying that resizing is *not* a necessity, except
you want to use the (larger) space of the partition. A filesystem
doesn't really care for the size of the partition. That's what I wanted
to express... just that it doesn't happen automatically, and on the
other hand is not necessary in order to use the old data.

-hwh
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Re: [gentoo-user] Moving linux system to another partition

[Dale]

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Alan McKinnon wrote:
> On Friday 08 June 2007, Hemmann, Volker Armin wrote:
>   
>> On Freitag, 8. Juni 2007, Aleksey Kunitskiy wrote:
>>     
>>> Hi all,
>>>
>>> Is it safe to move my linux system by using:
>>> #>cp -rp /mnt/old_part /mnt/new_part
>>> and approriate changes in grub.conf/fstab on new system location ?
>>>       
>> nope.
>>
>> cp -a if you really want to use copy. But doesn't kill that the
>> ctime/mtime making uninstalling things a pain?
>>     
>
> No.
>
> cp -a is equivalent to cp -dpPR
>
> and from the man page:
>
> -p     same as --preserve=mode,ownership,timestamps
>
> What the OP *will* have a problem with a copying /proc, /dev, /sys and 
> other virtual filesystems. When I do this trick, I usually dd or tar or 
> cp -a entire filesystems and then copy / with this trick:
>
> mount -o bind / /some/tmp/dir
> cp -a /some/tmp/dir /some/other/dir
>
> This ensures that only files actually on-disk are copied
>
> alan
>
>
>   


This is something I have done several times.  This is how I do it.  Boot
the Gentoo CD or some other live CD, Knoppix should work.  After you get
booted up, mount the partitions, old and new, then use this command:  cp
-av /path/to/old /path/to/new and sit back and watch it all scroll by. 
It may take a good while depending on how much stuff you have to copy.

I'm not saying that someone else doesn't have a better idea.  I have
seen where people tar the stuff then untar it to the new drive.  To me,
it is a useless step.  What I use has worked for me every time and I
have done it quite a bit.

I hope that helps.

Dale

:-)  :-)  :-)  :-)

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Re: [gentoo-user] Moving linux system to another partition

[Mauro Faccenda]

On Friday 08 June 2007 12:39, Aleksey Kunitskiy wrote:

> > When I moved around on harddisks some years ago, I followed some
> > instructions found on the suse-hp. And they used tar.
>
> Any helpful suggestions(links?) ?

if you are doing it between different filesystems, keep in mind that some 
doesn't store the same informations about the files...

and would be better if the filesystem from where you will copy, is mounted in 
read-only mode.

if you are only aware about permissions, you can use "tar -p" but, if the 
destination filesystem is the same or unix-like (not vfat or ntfs) i'd prefer 
using "rsync -a" to doing this job.

but if you have any doubt... the manual is your friend. ;)

man tar
man rsync
man cp

[]'s
	.m
-- 
gentoo-user@gentoo.org mailing list

Re: [gentoo-user] Moving linux system to another partition

[Albert Hopkins]

On Fri, 2007-06-08 at 18:05 +0300, Aleksey Kunitskiy wrote:
> Hi all,
> 
> Is it safe to move my linux system by using:
> #>cp -rp /mnt/old_part /mnt/new_part
> and approriate changes in grub.conf/fstab on new system location ?

'cp -a' (or better rsync -a) is probably better than 'cp -rp' for that
purpose.  But what I usually do is 'tar -c ... | tar -x ...'.  I don't
really know if it's better or not than using 'cp'. I just do it out of
habit.


--
Albert W. Hopkins

-- 
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Re: [gentoo-user] Moving linux system to another partition

[Mauro Faccenda]

On Friday 08 June 2007 12:54, Albert Hopkins wrote:
> On Fri, 2007-06-08 at 18:05 +0300, Aleksey Kunitskiy wrote:
> > Hi all,
> >
> > Is it safe to move my linux system by using:
> > #>cp -rp /mnt/old_part /mnt/new_part
> > and approriate changes in grub.conf/fstab on new system location ?
>
> 'cp -a' (or better rsync -a) is probably better than 'cp -rp' for that
> purpose.  But what I usually do is 'tar -c ... | tar -x ...'.  I don't
> really know if it's better or not than using 'cp'. I just do it out of
> habit.

if you do tar in this way, is better to use "tar -pc ... | tar -px ..."

[]'s
	.m
-- 
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Re: [gentoo-user] Moving linux system to another partition

[Benno Schulenberg]

Mauro Faccenda wrote:
> On Friday 08 June 2007 12:54, Albert Hopkins wrote:
> > On Fri, 2007-06-08 at 18:05 +0300, Aleksey Kunitskiy wrote:
> > > Is it safe to move my linux system by using:
> > > #>cp -rp /mnt/old_part /mnt/new_part
> >
> > 'cp -a' (or better rsync -a) is probably better than 'cp -rp'
> > for that purpose.  But what I usually do is 'tar -c ... | tar
> > -x ...'.
>
> if you do tar in this way, is better to use 
> "tar -pc ... | tar -px ..."

The -p option only does something when extracting an archive, so 
that first -p is pointless.  Better use 'tar' instead of 'cp -a', 
though, as it's much faster when copying many little files.

  cd /sourcedir && tar -cf - .  |  (cd /destdir; tar -xpvf -)

Benno
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[gentoo-user] Re: Moving linux system to another partition

[Remy Blank]

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Aleksey Kunitskiy wrote:
> Is it safe to move my linux system by using:
> #>cp -rp /mnt/old_part /mnt/new_part
> and approriate changes in grub.conf/fstab on new system location ?

I have used "rsync -avH" in the past (-H preserves hardlinks), and with
more recent versions of rsync (and if you have ACLs or XATTRs), I would
use "rsync -avHAX".

And yes, do ensure that nothing writes to the partition while you're
copying, so the best thing is probably to do that from a LiveCD, where
the source partition is mounted read-only.

- -- Remy
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Re: [gentoo-user] Moving linux system to another partition

[Vladimir Rusinov]

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On 6/8/07, Aleksey Kunitskiy <alexey.kv@gmail.com> wrote:
>
> Is it safe to move my linux system by using:
> #>cp -rp /mnt/old_part /mnt/new_part
> and approriate changes in grub.conf/fstab on new system location ?
>

cp -ax / /mnt/newroot
cp -ax /dev/ /mnt/newroot

Is always works for mine. Second line required in order to boot.


-- 
Vladimir Rusinov
GreenMice Solutions: IT-решения на базе Linux
http://greenmice.info/

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