Vg recreation after booting from tape

[Evert Jan van Ramselaar]

Hello,

I have booted a HP9000 with a HP/UX1020 boottape created with Ignite/UX. However, when I want to create the vg's (except vg00), I get an error indicating that device files exist. Furthermore, the vg's are already mentioned in /etc/lvmtab.

How do I recreate the vg's and lv's after booting from tape?

Evert Jan

[Andreas Voss]

Hi,

you can re-create the /etc/lvmtab with the command:

vgscan

Greetings

Andrew

[Evert Jan van Ramselaar]

Tnx 4 your reply.

I guess this will not work when using completely new disks? This happens to be so in our case.

Evert Jan

[Andreas Voss]

Hi,

could you please give me more detailed information on what errors you get.

Andrew

[Alan Riggs]

IF I understand properly you have rebuilt a machine with an Ignite tape and have fresh disks on the server. You now want to build your volume groups (apart from vg00) and are being denied. To correct this:

mv /etc/lvmtab /etc/lvmtab.bak
vgscan -av

That should give you a new lvmtab which registers only the disks in vg00. You may now create your volume groups as normal.

One note: you probably have group files and dev/vg* directories which match those on the system you cloned. You may wish to remove and recreate these if they do not match the planned architecture for this system.

[Evert Jan van Ramselaar]

We called HP Tech Support for this problem. It seems to be a know problem with some versions of Ignite. Solution was to vgremove the vg's and then delete the /dev/vg??.

Evert Jan

[Denver Osborn]

You wouldnt be able to vgremove the vg's if the pv's are not there. recreate the lvmtab file and remove the /dev/vg?? directories for the non-existing vg's. Then you'll be able to make the new vg directories and group files you need or do it via SAM.

[Shyam Kishore]

Hi,

If I could understand the quostion correctly, you are looking for recreation of VGs afresh. for that first you move the /etc/lvmtab to /etc/lvmtab.old then pvcreate using #pvcreate -f option to create the PVs forcefully (be sure to use the Proper device files).

All the best.

-Shyam

[Shyam Kishore]

Hi,

If I could understand the quostion correctly, you are looking for recreation of VGs afresh. for that first you move the /etc/lvmtab to /etc/lvmtab.old then pvcreate using #pvcreate -f option to create the PVs forcefully (be sure to use the Proper device files).

All the best.

-Shyam

[Cheryl Griffin]

I just had a similar issue with a system recovered by a make_recovery tape. We received an error when trying to mount the filesystem:

vxfs mount: I/O error
vxfs mount: cannot mount /dev/vg01/apps

fsck, vgreduce did not resolve the problem.
We vgexported the filesystem, recreated it and recovered it from another backup.

[Anthony Goonetilleke]

HI,
We came across a similar situation in a disaster recovery project, wheat you can do is use the existing /dev/vg*/group files and simply recreate the volume groups as normal with the new disks.

i.e
1 ) remove /etc/lvmtab
2) do a vgscan you should now only have vg00 in the lvmtab
3) skip the mknod part and do the rest of the steps to create the volume group.

hope this helps