topic Re: Recover old Volume Group in Operating System - HP-UX

Recover old Volume Group

Tonatiuh — Thu, 27 Nov 2008 13:10:17 GMT

HP-UX 11.11.

2 disks in my system. One volume group, one in each disk. I reinstalled OS using only the disk 1.

How can I recover my old volume group (with its logical volumes) still existing in the disk 2?

Re: Recover old Volume Group

unixguy_1 — Thu, 27 Nov 2008 13:18:12 GMT

Hi Tonatiuh,

I thing this is not possible,becuase if u r going to add a new disk,it will be automatically formated,

so you are not able to recover the VG.

Regards,
Unixguy.

Re: Recover old Volume Group

Wim Rombauts — Thu, 27 Nov 2008 13:21:57 GMT

Unless disk 2 contains a second copy of an OS, which has correct knowledge of the VG-configuration of disk 1, you cannot recover your VG.

And even if you recover your VG, you will need a backup to restore the data.

Re: Recover old Volume Group

likid0 — Thu, 27 Nov 2008 13:22:25 GMT

yes, it's still there.

You have 2 options, import the vg with the names of the lvols or with the default name lvols

with name of lvols:

Do you still have a map from the vg?

or a cfg2html, somewhere where you can look at the names of the lvols?

if you have you can import with:
vgimport -m vgmapfile /dev/vgname /dev/dsk/disk

if not you have to import:
vgimport /dev/vgname /dev/dsk/disk

and the names of the lvols will be lvol1,lvol2,etc

Just mount them to guess what where their names, and change then with a mv

Re: Recover old Volume Group

likid0 — Thu, 27 Nov 2008 13:24:58 GMT

If i understand this:

2 disks in my system. One volume group, one in each disk. I reinstalled OS using only the disk 1.

It means you had to independent VG's, 1 in each disk, then it is posible to get your data from the disk that doesn't have the os

Re: Recover old Volume Group

unixguy_1 — Thu, 27 Nov 2008 13:27:49 GMT

Hi,

yes Orange adm is correct,

if u have a map file for that VG,
it will be going recover it.

use the below mentioned commands

#vgimport -s -p -m /tmp/vg01.map /dev/vg01

the above mentioned commands is going to recover a VG.

but if u don't have it's not possible to do it.

Regards,
Unixguy.

Re: Recover old Volume Group

Ganesan R — Thu, 27 Nov 2008 13:28:29 GMT

Hi,

You can recover the volume group with the help of vgimport command

Just issue the below commands.

#mkdir /dev/vgnew
#mknod /dev/vgnew/group c 64 0x030000
#vgimport /dev/vgnew
#vgimport /dev/vgnew /dev/dsk/c0t5d0

#vgchange -a y /dev/vgnew
#vgdisplay -v /dev/vgnew

It will list the available logical volumes

Mount the logical volumes and access the data.

Re: Recover old Volume Group

Analyst — Thu, 27 Nov 2008 13:32:35 GMT

If I understood your query,

Yes you can recover it using the map files, if exists.

After exporting/importing.
go for vgscan command.
there is possibilities to get the configurations back.

Re: Recover old Volume Group

Tonatiuh — Thu, 27 Nov 2008 14:58:40 GMT

I already have tried importing the vg and does not work.

Any other idea?

Re: Recover old Volume Group

Ganesan R — Thu, 27 Nov 2008 15:08:27 GMT

Hi Tonatiuh,

Post the error you received when you try to import. That will help us to provide more solutions..

Other than vgimport, I don't think anyway you can import the data.

Re: Recover old Volume Group

Tonatiuh — Thu, 27 Nov 2008 15:09:14 GMT

Due to the failed tries (and my schedule), my need has changed.

I want to be able to create a new filesystem in that disk 1, but it shows me an error, I think because the importing filed.

pvcreate: The physical volume "/dev/dsk/c2t2d0" in the "/etc/lvmtab" file.

Any secure idea aboout it?

Re: Recover old Volume Group

Tonatiuh — Thu, 27 Nov 2008 15:10:52 GMT

The correct error text whtn I try to create a new lvol in disk 1:

pvcreate: The physical volume "/dev/dsk/c2t2d0" is already recorded in the "/etc/lvmtab" file.

Re: Recover old Volume Group

Ganesan R — Thu, 27 Nov 2008 15:59:09 GMT

Hi Tonatiuh,

Either export the vg from /etc/lvmtab or recreate the /etc/lvmtab file

1.Export the /etc/lvmtab

#strings /etc/lvmtab --> note down the imported vgname.
#vgexport -v /dev/vgname

2. Recreate the lvmtab file.

#mv /etc/lvmtab /etc/lvmtab.old
#vgscan -av

This will remove the entry from lvmtab. Now you can create pvcreate on that disk.

Re: Recover old Volume Group

Tonatiuh — Thu, 27 Nov 2008 16:55:53 GMT

Thank you Ganesan R.