Re: How to fix two disks with the same Volume Group?


On Thu, 2008-03-20 at 11:38 +0000, Luciano Rocha wrote:
On Thu, Mar 20, 2008 at 08:58:04PM +1000, Da Rock wrote:

On Thu, 2008-03-20 at 10:22 +0000, Luciano Rocha wrote:
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?

Yes, or you can boot to the installation screen, then switch to the 2nd
console (ctrl+alt+f2), where you'll find a command prompt.

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.

Yes, if the change was made in the repair disk, the kernel version will
probably be different, and the paths are relative to the system's root.

But the rename can be done while the system is running, so only the
followin pass is missing:
0. vgrename ...

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.

Currently the filesystem is defined before the network (and, thus, the
hostname). Also, you might have two different installations with the
same hostname (like a new install to a new set of hard disks).

But I do use the hostname as the VG, so I think that's best, probably
with current date appended (like: hostname080320).

Regards,
Luciano Rocha

Good to know. Thanks

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