recovering Data

[himacs]

Hi Admins,

Let me tell the scenario..

One of my server is down..and has 1HDD with some data..
i want to recover the data
since server is down , vgexport/import is not possible..

how can i recover the data with connecting to another server..

Actually this is not happened,one of my friend asked the doubt..


Regards,
himacs

[Pete Randall]

If you can attach the HDD to another server, it can be vgimported - there is no need to vgexport prior to vgimport.


Pete

[Torsten.]

Was the disk configured with LVM? Was this disk the only member of a certain VG? If yes, connect it to another server and use vgimport.

[himacs]

Hi Pete,Torsten

Thanx for the reply..


<>

Plz tell me the exact steps to be performed..

If that HDD has VG00 and existing one also having VG00..how to proceed..


regards
himacs

[Ganesan R]

Hi Himacs,

If you are connecting the HDD to another server, the only concern is device file get changed.

What you need to do is, boot the server into maintanance mode, export the root VG and reimport it, which will import the VG with new device files.

[Ganesan R]

Hi Again,

Look at this document. "Appendix J" gives the exact steps you need to perform for this activity.

http://docs.hp.com/en/5991-1236/When_Good_Disks_Go_Bad_WP.pdf

[himacs]

Hi Ganesan,

Thanx for the reply..

<<7.
To create the volume group and the group file to be used for the vgimport command, enter: # mkdir /dev/vg00 # mknod /dev/vg00/group c 64 0x000000

OK.. let me explain the scenario again..

The new server already has VG00..etc
I want to recover the data from HDD of old server(which is down now) with connecting to new server..I dont want to use the HDD with new server.Just i want to recover the data..
And i dont have any /etc/lvmtab details of old server.

regards
himacs

[Mel Burslan · Accepted solution]

Himacs,

No, the VG you will import does NOT have to bear the same name as it was originally named. So, your vg00 coming from the dead server can be named as any vg on the running system. Make sure the vg name/number is unique on the new and running server.

mkdir /dev/vg09 # assuming vg09 did not exist
mknod /dev/vg09/group c 64 0x090000
vgimport /dev/vg09 /dev/dsk/cXtXdX # modify cXtXdX according to your condition

since you will not have a mapfile, the logical volumes may ne named randomly but the contents of these volumes should still be in there. It is just a game og hunt and peck from this point on.

[Ganesan R]

Hi Himacs,

We understood the scenerio now. You want to to connect the root HDD to another running server and want to recover the data.

1.Connect the HDD
2.#ioscan -fnC disk
3.#insf -e -v (if need)
4.#mkdir /dev/vg00old
5.#mknod /dev/vg00old/group c 64 0x090000(assuming 0x090000 not being used already)
6.#vgimport /dev/vg00old 7.#vgchange -a y /dev/vg00old
8.#vgdisplay -v /dev/vg00old
9.#mount

Hope this helps...

[himacs]

Hi Ganesan,Mel..

Thanx for ur response..

So no need to go LVM maintenance mode..

After connecting and rebooting we can perform the steps..


regards
himacs