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Old 04-13-2008, 11:07 AM   #1
geoff3
LQ Newbie
 
Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
Posts: 29

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Howto move /home to 2nd disk


Hi,
I've just added a 2nd larger disk and would like to transfer /home to it.
I've tried this:
mkdir /mnt/newhome
mount -t ext3 /dev/sdb1 /mnt/newhome
cd /home
cp -ax * /mnt/newhome
unmount /mnt/newhome
up to now everthing is perfect.
mv /home /old_home
gives me:
mv: cannot move `/home' to `/old_home': Device or resource busy
I've tried doing:
init 3 and then repeating the move cmd but I get the same result, what am I doing wrong?
Geoff
 
Old 04-13-2008, 12:00 PM   #2
Slokunshialgo
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Registered: Jan 2006
Distribution: Ubuntu 9.04, Fedora 10
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Not 100% sure, but a couple things that could be causing it are that you could still be in the home directory (check your present working directory to make sure you're in /, not /home/...), or there could be a user logged in who's home is in /home (anybody but root). Try going down to runlevel 1, as runlevel 3 is normally the same as 5 but without a GUI, which could be causing interference. 1 is single-user, meaning only root can do anything.

As a final note, don't forget to edit your /etc/fstab file to auto-mount sdb1 as your /home. This line should work:
Code:
/dev/sdb1        /home            ext3        defaults         1   2
 
Old 04-13-2008, 12:04 PM   #3
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
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This might help.
This is my situation at the moment:
[root@localhost geoff]# df
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 15G 8,1G 5,8G 59% /
/dev/sda7 49G 16G 34G 32% /home
/dev/sdb1 199G 16G 176G 9% /mnt/newhome
 
Old 04-13-2008, 12:16 PM   #4
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
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Same thing (I am an single user)

[root@localhost usr]# cd /
[root@localhost /]# dir
bin initrd opt trash.desktop
boot lib proc upgrade.desktop
dead.letter libjavaplugin_oji.so register.desktop usr
dev lost+found root var
etc media sbin Welcome.desktop
home media.desktop sys
Home.desktop mnt tmp
[root@localhost /]# mv /home /old_home
mv: cannot move `/home' to `/old_home': Device or resource busy

Do I have to create old_home with mkdir before hand?
 
Old 04-13-2008, 12:47 PM   #5
Tischbein
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Registered: Oct 2006
Distribution: debian
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If you boot from knoppix you can be pretty certain that home isn't being used or, worse, is changing under you. But I think that is not the problem. /home is likely to be a partition. Look in /etc/fstab to confirm or run "mount". If so, edit /etc/fstab so that /home points at the new partition instead. Maybe also make a directory /mnt/old_home and add a line to /etc/fstab to automatically mount that. Reboot for the new settings to take effect.

You could unmount /home whilst running on the system, but that might go horribly wrong. If you are logged in as root and no-one else is logged in you might be OK, otherwise I think this is just asking for trouble big time. Maybe not . Root's home is not (usually) in /home.

Before starting - Make a backup of /etc/fstab and have a working knoppix disk to hand in case you find yourself locked out!

Have fun, Entenbein.

p.s. try to keep a log of everything you do - copy it to a file (and keep saving the file) or write it down so that we can help you if anything goes wrong.

Last edited by Tischbein; 04-13-2008 at 12:50 PM.
 
Old 04-13-2008, 01:08 PM   #6
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
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This is what I have in fstab:

/dev/sda1 / ext3 relatime 1 1
/dev/sda7 /home ext3 relatime 1 2
/dev/cdrom /media/cdrom auto umask=0022,users,iocharset=utf8,noauto,ro,exec 0 0
none /proc proc defaults 0 0
/dev/sda5 swap swap defaults 0 0
/dev/sda6 swap swap defaults 0 0

"edit /etc/fstab so that /home points at the new partition instead"
not sure how to do that, I can't call the new partition /home yet until I get rid of the old one.

I've checked on the new disk by mounting it as /newhome that my data is there.
 
Old 04-13-2008, 01:44 PM   #7
lazlow
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Registered: Jan 2006
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Logged in as root (not just su).

umount /home

Edit fstab so the /home points to the new drive.

mount -a

Try logging into user and make sure that the shuffle worked. If it did you can delete the /home partition on the old drive and expand one of the other partition to regain the space.
 
Old 04-13-2008, 03:02 PM   #8
geoff3
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Location: south of France, Perpignan
Distribution: Mandriva 2010
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Smile

Magic, ca marche!! (that means it works)

thanks to all, Slokunshialgo, Tschbein, and lazlow

Geoff
 
Old 04-16-2008, 03:03 PM   #9
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
Posts: 29

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Hi, I'm back with more pbs
To recover the space used by /home I deleted the old partition on sda.
I expected to be able to extend the / partion with gparted but no, for some reason when I booted the CD it could not find my screen (pbs with xorg?).
So, seeing as I had backed-up everything I re-installed Mandriva 2008 from my DVD. This obviously gives me back a /home on sda which I don't want.
Question:
how do I install Linux on sda without /home so that it will use the /home on sdb.
Geoff
 
Old 04-16-2008, 03:55 PM   #10
bigrigdriver
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Registered: Jul 2002
Location: East Centra Illinois, USA
Distribution: Debian Squeeze
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During installation you should be prompted for the location to install the OS. I haven't used Mandriva, but other distros I have used offered the opportunity to select where to install /, /home, or any other directory to it's own partition.

So, during installation, elect to install / to sda and /home to sdb.

Last edited by bigrigdriver; 04-16-2008 at 03:57 PM.
 
Old 04-17-2008, 01:05 AM   #11
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
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Quote:
Originally Posted by bigrigdriver View Post
So, during installation, elect to install / to sda and /home to sdb.
Will this not wipe-out my data in /home on sdb?
 
Old 04-17-2008, 09:44 AM   #12
geoff3
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Registered: Sep 2006
Location: south of France, Perpignan
Distribution: Mandriva 2010
Posts: 29

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In response to my own question, if you don't ask for the partition (/home) to be formatted you don't loose your data.
Easy when you know
 
  


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