Re: How to fix two disks with the same Volume Group?
- From: Da Rock <rock_on_the_web@xxxxxxxxxxxxx>
- Date: Thu, 20 Mar 2008 20:58:04 +1000
On Thu, 2008-03-20 at 10:22 +0000, Luciano Rocha wrote:
On Thu, Mar 20, 2008 at 08:12:05PM +1000, Da Rock wrote:
On Thu, 2008-03-20 at 08:48 +0000, Chris G wrote:
I have just had Fedora 7 re-installed on my work desktop as the old
disk drive was slowly failing.
I need to access the old disk if I can, it's still in the system and
visible but the person who installed it didn't change volume groups so
I have two disk drives with the same volume group. How do I change the
name of the old disk's volume group so I can mount it and see it?
Running vgscan returns:-
Reading all physical volumes. This may take a while...
WARNING: Duplicate VG name VolGroup00: Existing
P6sqp0-rIos-JYmi-8L32-ymtN-LzB4-g5BdLL (created here) takes precedence
over TdWFKp-H4tw-UrVq-Jmre-26hv-zmyE-IZXQLI
Found volume group "VolGroup00" using metadata type lvm2
Found volume group "VolGroup00" using metadata type lvm2
--
Chris Green
Actually its a real pain the ***. Bee there, done that. For future
reference- when installing change the name of the fs to the machine
name. Saves these sorts of issues, I found this out the hard way and
came across this gem on the net.
Forgive me for going into a taboo area, but the way I fixed it (vgrename
won't work in this case I reckon- please try though) was to throw an
Ubuntu live disk in the cdrom and boot, download lvm2 from the Ubuntu
repo (Debian won't work- although if Debian make a live disk then use
their repo). Run update software and run the vgrename from there. If you
need root password then (it seems a little redundant but anyway... it
works for me...) go to administration and users and change the root
password there.
You can use the install/recovery disc for Fedora. On the command line,
you'll have to prefix the lvm commands with lvm, like this:
lvm pvscan
lvm vgscan
lvm vgchange
...
Good to know- a shortcut. Is this under repair on the install cd?
Seeing you can't have both disks with the same name at the same time,
you'll need to change the name of your current disk. If you reboot it
will fail once you've renamed, so make sure you change your grub, init
file, and mount your main lvm partition and change your inittab file to
match your new name.
You mean:
1. edit grub.conf, change root= to the new name
2. edit etc/fstab, change swap, root, etc. to use new name
3. re-create initrd, as it has the vg name hardcoded:
mkinitrd -f -v /boot/initrd-`uname -r`.img `uname -r`
You can do this while the system is running, and then reboot. No need
for recovery/lice cd (if everything goes fine; you'll need it if the
system no longer boots).
Surely not if you've just changed the name using the repair disk? But
very succinctly put- I've only done this once and it took several hours
following from instructions on a page. I had trouble remembering the
exact steps myself.
This is very involved, I know, so ensure you have an instruction web
page up there to follow from. Run a google search on how to use Ubuntu
to rectify an lvm. If you find the right one, it'll have all the
instructions you need- except for the inittab: found that out the hard
way. If you don't fix that, you get a selinux error and it won't boot
properly.
I think you're confusing inittab with fstab (or initrd). The inittab
file has no reference to the root device.
Yes, I do apologise for the confusion. I rectified that in a later
email.
Good luck
Yeah, that's always needed.
I'd suggest that new Fedora releases create a random name for the VG and
that their initrd/nash support getting the vg from the root= kernel
command line.
Regards,
Luciano Rocha
You don't think setting it to the machine name is any good? Given
current install procedures, what do you suggest to prevent this?
Obviously something manually.
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