CentOS / RHEL : How to move a Volume Group from one system to another

To move a whole volume group from one system to another, the vgexport and vgimport commands can be used. Below example involves the steps to move a volume group named “data_vg” from one system to another. The logical volume from this volume group is initially mounted at /data01.

1. Un-mount the file system

If required switch to “rescue” mode. Make sure that no users are accessing files on the active volume.

# umount /data01

2. Mark the volume group inactive

Marking the volume group inactive removes it from the kernel and prevents any further activity on it.

 
# vgchange -an data_vg

vgchange -- volume group "data_vg" successfully deactivated

3. Export the volume group

This prevents it from being accessed on the “old” host system and prepares it to be removed.

# vgexport data_vg

vgexport -- volume group "data_vg" successfully exported

4. Un-present the Disk

Once the Disk has been unplugged from the server, it can be shutdown. The Disk can now be presented to the new Server on which VG data_vg has to be discovered.

5. Present the Disk to the new Server

When plugged into the new system it becomes /dev/sdb so an initial pvscan shows as below:

# pvscan 
pvscan -- reading all physical volumes (this may take a while...) 
pvscan -- inactive PV "/dev/sdb1" is in EXPORTED VG "data_vg" [996 MB / 996 MB free] 
pvscan -- inactive PV "/dev/sdb2" is in EXPORTED VG "data_vg" [996 MB / 244 MB free] 
pvscan -- total: 2 [1.95 GB] / in use: 2 [1.95 GB] / in no VG: 0 [0]

6. Import the Volume Group

If importing on an LVM 2 system, run below command:

# vgimport data_vg 

Volume group "data_vg" successfully imported

Else if importing on an LVM system, add the PVs that need to be imported:

# vgimport data_vg /dev/sdb1 /dev/sdb2

vgimport -- doing automatic backup of volume group "data_vg"

vgimport -- volume group "data_vg" successfully imported and activated

7. Activate the volume group

# vgchange -ay data_vg

8. Mount the file system

# mkdir -p /data01
# mount /dev/data_vg/lv_data01 /data01


####

ls /sys/class/scsi_device/ | while read scsidev ; do echo 1 > /sys/class/scsi_device/$scsidev/device/rescan ; done

echo "- - -" > /sys/class/scsi_host/host0/scan*


umount /filesystem

echo "offline" > /sys/block/OLD_DISK/device/state
echo "1" > /sys/block/OLD_DISK/device/delete

vgchange -an vg_group

vgexport vg_group
vgimport vg_group /dev/sde (next disk)

vgchange -ay vg_group

mount /dev/mapper/vg_group_lv /filesystem

cd /filesystem

####


0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
20 IPtables Examples For New SysAdmins
Viewed 1119 times since Fri, May 15, 2020
How do I add ethtool settings to a network device permanently?
Viewed 4763 times since Mon, May 21, 2018
Epoch & Unix Timestamp Conversion Tools
Viewed 30445 times since Fri, Jun 22, 2018
Easily Find Bugs In Shell Scripts With ShellCheck
Viewed 1379 times since Thu, Apr 18, 2019
FIO (Flexible I/O) – a benchmark tool for any operating system
Viewed 18032 times since Wed, Jul 25, 2018
RHEL: What is "SysRq key" and how to use it
Viewed 2845 times since Sat, Jun 2, 2018
O’Reilly’s CD bookshelf
Viewed 7606 times since Wed, Jun 27, 2018
awk printf
Viewed 11456 times since Wed, Aug 19, 2020
Oracle Linux 7 – How to audit changes to a trusted file such as /etc/passwd or /etc/shadow
Viewed 1811 times since Wed, Jul 25, 2018
Method 2 – Use shell scripts How to install yum cron on a CentOS/RHEL 6.x/7.x
Viewed 1262 times since Tue, Dec 4, 2018