[linux-lvm] How to migrate data from one Hard Drive to a new one

[linux-lvm] How to migrate data from one Hard Drive to a new one

[Luca Da Col]

Hello Linux LVM list, 

I apologize if my question has been already answered.The search engines 
didn't answer to an issue I'm dealing with...

My actual Hard Drives configuration is the following 
(FS is ext3 for both ones - I'm running Red Hat 9):


Disk /dev/hda: 6448 MB, 6448619520 bytes
255 heads, 63 sectors/track, 784 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1   *         1        13    104391   83  Linux
/dev/hda2            14        77    514080   8e  Linux LVM
/dev/hda3            78       784   5678977+  8e  Linux LVM

for my first disk, where I've also installed LILO, and 


Disk /dev/hdb: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdb1             1      2550  20482843+  8e  Linux LVM
/dev/hdb2          2551      3700   9237375   8e  Linux LVM
/dev/hdb3   *      3701      4865   9357862+  39  Plan 9

for the second one. 


I finally decided to upgrade my old 6.5G HD to a new 120G HD; is the procedure described in
http://www.tldp.org/HOWTO/LVM-HOWTO/removeadisk.html  a safe way to migrate all my data 
from the former to the 120G? I mean, my case is slightly different from the one described 
because of /boot partition and LILO in the MBR...

I've found that some programs would easily upgrade HDs. Does anyone know how 
they work with LVM and how safe would be the upgrade with those kind of tools?


Thanks in advance for your help and apologize if this question does not fit into this mailing list. 

Rgds,
Luca

-- 
Luca Da Col <luca.dacol@tiscali.it>

Re: [linux-lvm] How to migrate data from one Hard Drive to a new one

[Jon Bendtsen]

Luca Da Col wrote:

[cut]

> I finally decided to upgrade my old 6.5G HD to a new 120G HD; is the procedure described in
> http://www.tldp.org/HOWTO/LVM-HOWTO/removeadisk.html  a safe way to migrate all my data 
> from the former to the 120G? I mean, my case is slightly different from the one described 
> because of /boot partition and LILO in the MBR...

yes, but if you are worried, you can do it like this:
mount the new "partition" (real or LV) to /mnt
cd /the_source, eg. /usr /var /home ...
find -xdev | cpio -pm /mnt
umount /mnt
repeat for the next source.

The process is described in the software raid howto.
Remember to edit the new /etc/fstab and new /etc/lilo.conf,
and run lilo with lilo -r /mnt



JonB

Re: [linux-lvm] How to migrate data from one Hard Drive to a new one

[Luca Da Col]

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Hello LVM mailing list, 

thank you very much for your reply. I could be able to upgrade to a new
120G HD. My second goal was to create 2 new partitions and extend my
/home directory: 

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1   *         1        13    104391   83  Linux
/dev/hda2            14        77    514080   8e  Linux LVM
/dev/hda3            78       784   5678977+  8e  Linux LVM

New partitions: 

/dev/hda4           785     14593 110920792+   5  Extended
/dev/hda5           785     13500 102141238+  8e  Linux LVM
/dev/hda6         13501     14593   8779491   86  NTFS volume set


Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/Volume00/LogVol00
                       6047492   4196432   1543860  74% /
/dev/hda1               101089     27212     68658  29% /boot
/dev/Volume00/LogVol02
                      28759040  24646092   2652112  91% /home
none                    386184         0    386184   0% /dev/shm

I then performed: 

1) pvcreate /dev/hda5
2) vgextend Volume00 /dev/hda5
3) lvextend  --size +97.4g /dev/Volume00/LogVol02 /dev/hda5

but my /home is still 28G

I was wondering if it's a  file system issue, because /dev/hda5 has not
been formatted and mke2fs. By the way, I cannot make2fs
/dev/Volume00/LogVol02 because I would destroy all my /home. 

Any idea? 

Thanks 
Rgds,

Luca




On Sun, 2003-08-31 at 11:26, Jon Bendtsen wrote:
> Luca Da Col wrote:
> 
> [cut]
> 
> > I finally decided to upgrade my old 6.5G HD to a new 120G HD; is the procedure described in
> > http://www.tldp.org/HOWTO/LVM-HOWTO/removeadisk.html  a safe way to migrate all my data 
> > from the former to the 120G? I mean, my case is slightly different from the one described 
> > because of /boot partition and LILO in the MBR...
> 
> yes, but if you are worried, you can do it like this:
> mount the new "partition" (real or LV) to /mnt
> cd /the_source, eg. /usr /var /home ...
> find -xdev | cpio -pm /mnt
> umount /mnt
> repeat for the next source.
> 
> The process is described in the software raid howto.
> Remember to edit the new /etc/fstab and new /etc/lilo.conf,
> and run lilo with lilo -r /mnt
> 
> 
> 
> JonB
> 
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
-- 
Luca Da Col <luca.dacol@tiscali.it>

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[root@candido lvmgui-0.4]# vgdisplay -v
--- Volume group ---
VG Name               Volume00
VG Access             read/write
VG Status             available/resizable
VG #                  0
MAX LV                256
Cur LV                3
Open LV               3
MAX LV Size           255.99 GB
Max PV                256
Cur PV                5
Act PV                5
VG Size               131.63 GB
PE Size               4 MB
Total PE              33697
Alloc PE / Size       33693 / 131.61 GB
Free  PE / Size       4 / 16 MB
VG UUID               iS2cXG-EbA3-PfjC-MFLO-39iZ-fhkz-Id9jMF

--- Logical volume ---
LV Name                /dev/Volume00/LogVol00
VG Name                Volume00
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 1
LV Size                5.86 GB
Current LE             1500
Allocated LE           1500
Allocation             next free
Read ahead sectors     1024
Block device           58:0

--- Logical volume ---
LV Name                /dev/Volume00/LogVol02
VG Name                Volume00
LV Write Access        read/write
LV Status              available
LV #                   2
# open                 1
LV Size                125.27 GB
Current LE             32068
Allocated LE           32068
Allocation             next free
Read ahead sectors     1024
Block device           58:1

--- Logical volume ---
LV Name                /dev/Volume00/LogVol01
VG Name                Volume00
LV Write Access        read/write
LV Status              available
LV #                   3
# open                 1
LV Size                500 MB
Current LE             125
Allocated LE           125
Allocation             next free
Read ahead sectors     1024
Block device           58:2


--- Physical volumes ---
PV Name (#)           /dev/hda2 (1)
PV Status             available / allocatable
Total PE / Free PE    124 / 0

PV Name (#)           /dev/hda3 (2)
PV Status             available / allocatable
Total PE / Free PE    1385 / 0

PV Name (#)           /dev/hda5 (5)
PV Status             available / allocatable
Total PE / Free PE    24935 / 0

PV Name (#)           /dev/hdb1 (3)
PV Status             available / allocatable
Total PE / Free PE    4999 / 0

PV Name (#)           /dev/hdb2 (4)
PV Status             available / allocatable
Total PE / Free PE    2254 / 4


[root@candido lvmgui-0.4]# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE   PV "/dev/hda2" of VG "Volume00" [496 MB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda3" of VG "Volume00" [5.41 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/hda5" of VG "Volume00" [97.40 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/hdb1" of VG "Volume00" [19.53 GB / 0 free]
pvscan -- ACTIVE   PV "/dev/hdb2" of VG "Volume00" [8.80 GB / 16 MB free]
pvscan -- total: 5 [131.66 GB] / in use: 5 [131.66 GB] / in no VG: 0 [0]


lvextend -- rounding relative size up to physical extent boundary
lvextend -- extending logical volume "/dev/Volume00/LogVol02" to 125.27 GB
lvextend -- doing automatic backup of volume group "Volume00"
lvextend -- logical volume "/dev/Volume00/LogVol02" successfully extended

Re: [linux-lvm] How to migrate data from one Hard Drive to a new one

[Wolfgang Weisselberg]

Luca Da Col wrote 199 lines:

> 1) pvcreate /dev/hda5
> 2) vgextend Volume00 /dev/hda5

Ok, the Volume Group now has /dev/hda5 added.

> 3) lvextend  --size +97.4g /dev/Volume00/LogVol02 /dev/hda5

> but my /home is still 28G

Well, of course!
You have increased the partition (/dev/Volume00/LogVol02).
You have *not* increased the filesystem /home.

Instead of lvextend you should have used e2fsadm which runs both
lvextend and resize2fs (or ext2resize), and fsck, in the correct
order.  It's a good idea, generally, to umount /home first.

Please read the manpages of e2fsadm, resize2fs and ext2resize
for more information.

-Wolfgang