topic Cannot export volume group without entry in /etc/lvmtab in Operating System - HP-UX

Cannot export volume group without entry in /etc/lvmtab

Damien Lass — Sat, 27 Jul 2002 05:22:44 GMT

Hello all,
I am attempting to destroy a volume group using vgexport. The volume group does not have an entry in /etc/lvmtab. When I attempt to vgexport the volume group I receive the following error:
vgexport: Volume group "/dev/vgNN" does not exist in the "/etc/lvmtab" file.
vgexport: Couldn't export volume group "/dev/vgNN".

I need to export this volume group before I can re-import a new mapfile (with additional LVs) in its place. It Does anyone have any suggestions on how to get past this?

I have read a couple notes about re-building the /etc/lvmtab with a vgscan -v. Would this add back the volume group entry that is missing?

Any help would be greatly appreciated. Thanks in advance!

Re: Cannot export volume group without entry in /etc/lvmtab

A. Clay Stephenson — Sat, 27 Jul 2002 05:57:30 GMT

Yes, first mv /etc/lvmtab /etc/lvmtab.sav and then do a vgscan.

Re: Cannot export volume group without entry in /etc/lvmtab

George Petrides_1 — Sat, 27 Jul 2002 06:59:50 GMT

Vgexport removes the volume group entry from the /etc/lvmtab file and deletes the /dev/vgXX directory. If you need to use the vgexport command to create the mapfile, then maybe you are better off creating it manually. I think the format is
1 lvol1
2 lvol2

George

Re: Cannot export volume group without entry in /etc/lvmtab

Fragon — Sat, 27 Jul 2002 07:03:46 GMT

1. Using vgscan -v to rebuild your /etc/lvmtab file;
2. How about using "vgreduce and vgremove" to achieve your task?

-Gerald-

Re: Cannot export volume group without entry in /etc/lvmtab

Damien Lass — Sat, 27 Jul 2002 08:33:12 GMT

All,
I ran a 'vgscan -a -v' and created a new /etc/lvmtab. This didn't fix my problem. The volume group (and associated disks) I want to replace does not show up in the /etc/lvmtab. Is there any way I can manually remove my /dev/vgNN from /dev with the following steps:
1) # cd /dev/vgNN
2) # rm -R * (to remove the 'group')
3) # cd ../
4) # rmdir vgNN
5) # vgimport -m vgNN.mapfile -v /dev/vgNN /dev/dsk/ctd
(where vgNN.mapfile is the mapfile I want to move in)

Is this a valid option to export a volume group? If so, is there anything else I need to do or watch out for?

Any other suggestions are welcome!

Thanks!

Re: Cannot export volume group without entry in /etc/lvmtab

Damien Lass — Sat, 27 Jul 2002 09:16:36 GMT

To add to the message above... After reviewing my potential steps, I realized I am missing a couple steps. To add:

4)
5) mkdir /dev/vgNN
6) mknod /dev/vgNN/group c 64 0xNN00
THEN
7) vgimport -m vgNN.mapfile -v /dev/vgNN /dev/dsk/ctd

Sorry for the confusion!

Re: Cannot export volume group without entry in /etc/lvmtab

A. Clay Stephenson — Sat, 27 Jul 2002 10:14:16 GMT

When you make the group node for this vg, make absolute certain then the minor device number is unique. Look at the value in all the /dev/vgXX/groups and make sure that there is no conflict or absolute chaos will will.

e.g. mknod /dev/vg05/group c 64 0x050000 - 0x050000 should not be used anywhere else. By convention, vg05 uses 0x050000, vg02 uses 0x020000, etc. but that is not required (or may not be possible if already in use).

Re: Cannot export volume group without entry in /etc/lvmtab

Damien Lass — Sat, 27 Jul 2002 16:50:48 GMT

I ended up following the steps outline in my message(s) above. It worked out fine. A reference to the volume group was added back to the original /etc/lvmtab once I re-imported and activated the new volume group.

Thanks everyone for your input.