topic Re: Vgexport & Vgimport in Operating System - HP-UX

Vgexport & Vgimport

susee_sundar — Tue, 20 Jun 2006 23:42:18 GMT

Hi ,

What is the use of vgexport & vgimport command in LVM.Can anybody share the scenerio of using this commands.

Re: Vgexport & Vgimport

Chauhan Amit — Wed, 21 Jun 2006 00:02:14 GMT

vgexport - export an LVM volume group and its associated logical volumes.

vgimport - import an LVM volume group onto the system

Scenarios:

a)vgexport can be used to remove a volume group definitions from the system

b)Support you want to Import the volume group /dev/vg01 that is located on physical disks /dev/dsk/c0t1d0 , u need to use vgimport

c)you can also Import the volume group using the mapfile that was previously specified by the vgexport command on another
system.

-Amit

Re: Vgexport & Vgimport

Chauhan Amit — Wed, 21 Jun 2006 00:03:06 GMT

Another Scenario can be to move volume groups from one system to other systems within a high availability cluster.
This is pretty useful in ServiceGuard environment.

-AMit

Re: Vgexport & Vgimport

Arunvijai_4 — Wed, 21 Jun 2006 00:03:37 GMT

Hi Susee,

You can take a look at man pages,

http://docs.hp.com/en/B2355-60103/vgexport.1M.html
http://docs.hp.com/en/B2355-60103/vgimport.1M.html

-Arun

Re: Vgexport & Vgimport

Chauhan Amit — Wed, 21 Jun 2006 00:05:07 GMT

using vgexport the volume group will be removed without modifying the logical volume
information found on the physical volumes.
The volume group identified by vg_name is removed from the /etc/lvmtab
file, and the associated device files including the vg_name directory and group file are removed from the system.
The volume group information and data is untouched on the physical volume. These disks can be imported to other system with the vgimport command .

-Amit

Re: Vgexport & Vgimport

susee_sundar — Wed, 21 Jun 2006 00:32:22 GMT

HI

I got Few things But not so clear

COnsider:-

If I want to Shift my disk from

SERVER1:-

/dev/dsk/c2t5d0 --> /dev/vg02/lvol3
--> /dev/vg02/lvol5
--> /dev/vg02/lvol4

TO SERVER2..How can I access these logical volumes from the SERVER2.

The SERVER2 is sensing the disk ad

/dev/rdsk/c6t5d0--->

How can I access the Logical volumes ??

lvol3 ..?
lvol4 ..
lvol5 ..

Is it possible....& Share me if so...

Re: Vgexport & Vgimport

Chauhan Amit — Wed, 21 Jun 2006 00:40:55 GMT

Follow the below steos:

Server1:
vgexport -m vgname.mapfile /dev/vgname

*copy the file "vgname.mapfile" to /tmp in server2

Server2:
vgimport -v -m /tmp/vgname.mapfile /dev/vgname /dev/dsk/c6t5d0

you will be able to see the logical volumes on server2 without any issues

Keep in mind following things:
a)Ensure backup before proceeding with any such activity
b) LV shouldn't span to any other disk , otherwise you will not be able to recover that LV

-Amit

Re: Vgexport & Vgimport

harsr — Wed, 21 Jun 2006 00:55:20 GMT

Vgexport command creates a map file which contains the LVM information of the volume group on which the command is executed . This command is used in high availability clusters to present the shared vg's to other nodes . Further the map file that was created can be referenced with the vgimport command to import the LVM information of the volume group

Re: Vgexport & Vgimport

Albert_31 — Wed, 21 Jun 2006 20:25:12 GMT

One more thing.. it is used when you want to change the volume group names as well.

Re: Vgexport & Vgimport

susee_sundar — Mon, 26 Jun 2006 04:01:43 GMT

Closing the thread...