topic Re: Activate LVM in Operating System - HP-UX

Activate LVM

Gnananandhan — Fri, 24 May 2002 12:38:09 GMT

Hi leads,
I would like to like to activate a VGxx which is currently in deactivated status. I am not able to do so,
My requriement is even if I loose the data I want to configure the disk in the same VGxx, which is currently not possible because it say VGxx already exists.

How to solve the problem.

Thanks,
Gnana A.

Re: Activate LVM

Frederic Sevestre — Fri, 24 May 2002 12:43:43 GMT

Hi,

What is the error message when you try to activate the vgxx ?

Is it part of a cluster ?

Fr??d??ric

Re: Activate LVM

Sebastian Galeski_1 — Fri, 24 May 2002 12:44:12 GMT

I dont know if i understood You well but:
to activate vg gropu use:
#vgchange -a y vg_name
to add disk to greoup use:
#vgextend vg_name /dev/dsk/cxtxdx

If You want to create new group do
1. mkdir /dev/vg03
2. mknod /dev/vg03/group c64 0x030000
3. pvcreate -f /dev/rdsk/cxtxdx
4. vgcreate /dev/vg03 /dev/dsk/cxtxdx

To remove vg do
vgexport vg_name

hope it help

Re: Activate LVM

James R. Ferguson — Fri, 24 May 2002 12:44:36 GMT

Hi:

Please provide some more specific information of what led to the state you are in.

For instance, are you trying to 'vgimport'?

Check for a duplicate minor device number (i.e. one already present):

# ls -l /dev/vg*/group

Regards!

...JRF...

Re: Activate LVM

Martin Burnett_2 — Fri, 24 May 2002 12:47:55 GMT

Hello,

If your are trying to activate a VG use the following:

# vgchange -a y /dev/vg##

If your are trying to save data that is on a disk where the VGRA has become corrupted check the /etc/lvmconf/vg##.conf to see if it is correct:

# strings /etc/lvmconf/vg##.conf

If it appears to be correct you can use the command:
# vgcfgrestore /dev/vg## /dev/dsk/c#t#d#

This will restore the LVM data structures.

If you are trying to blow away the old VG so that it can be rebuilt:

# vgexport /dev/vg##
# pvcreate -f /dev/rdsk/c#t#d# <-THIS WILL DESTROY DATA!
# mkdir /dev/vg##
# mknod /dev/vg##/group c 64 0x##0000
# vgcreate /dev/vg## /dev/dsk/c#t#d#

Thanks for participating in the forums,

Martin
Chaos reigns within. Reflect, repent, and reboot. Order shall return.

#

Re: Activate LVM

PIYUSH D. PATEL — Fri, 24 May 2002 12:51:21 GMT

Hi,

first of all you need to find out the device file group exists in /dev/vg01 or not

ll /dev/vg01

If it does exists then

vgdisplay -v /dev/vg01
This will tell you if any disks are there in the vg or not

strings /etc/lmtab can also tell you.

You can always export this volume group and the import it back and still you will get the same vg01

Give other details also

vgchange -a y /dev/vg01
Are you using clustering ??

Piyush

Re: Activate LVM

MANOJ SRIVASTAVA — Fri, 24 May 2002 12:59:29 GMT

Hi Gnananandhan

The way to activate is vgchange -a y /dev/vgxx. But I think yuo are getting errros in doing so ,the errors can vary from missing PV's to stale volumes etc . In case yuo are getting some missing PV's try restoring the PV with vgcfgrestore , and then activate the volume group. Please do post the errors you get.

Manoj Srivastava

Re: Activate LVM

Gnananandhan — Fri, 24 May 2002 13:06:10 GMT

Thanks leads,
Anyway I had found the solution. I exported the volume group and recreated the same. By way of exporting- it removed all my VGxx directories and updated the /etc/lvmtab file.

I am saved. Thanks again. Definetly I will assign points whoever is near to the solution.