lvm re-install strategy

François Patte francois.patte at
Fri Feb 1 16:05:35 UTC 2008

Hash: SHA1

Le 01.02.2008 16:39, Adam Hough a écrit :
> If I am reading this right you still have unallocated space on /dev/sda?
> Option 1:
> If that is the case then with the DVD install just create a new logical
> volume (ie /dev/VGNAME/rootf8lv) to install Fedora 8 into that logical
> volume.  You can tell the install to use /dev/sdb1 as your /boot again
> and tell the installer to not format that device which will preserve the
> old Fedora 6 kernel files. (You might have to manually edit the
> grub.conf to add Fedora 6 as a boot option afterwards.

Thanks for answering. I think that I will follow option1; but what is
unclear for me is: how will I access logical volumes from volume group

My idea is to devote sda to the system, so one vg on sda2 with logical
volume usr, swap, tmp, opt, var,  and use vg sdb2+sdc1 for data,
including home.

Right now, home is on /dev/mapper/fedora-home and mounted from /dev
which is on sdb1.

As soon as the new install will be booted, this /dev won't exist no
more, because is it created if you boot with the "/"  partition on sdb1,
for the new system, it will be on sda1

There something there that I do not understand, so I might be unclear


> On Tue, 2008-01-29 at 12:16 +0100, François Patte wrote:
> Timothy Murphy a écrit :
> | François Patte wrote:
> |
> |> I have an fc6 install with LVM and want install f8.

> |
> |> I have 3 hdd: sda, sdb, sdc.
> |>
> |> sda has 1 partition: sda1 LVM
> |>
> |> sdb has 2 partitions: sdb1 ext3
> |>                       sdb2 LVM
> |>
> |> sdc has 1 partition: sdc1 LVM
> |>
> |> sdc1 and sdb2 are in the same volume group.
> |>
> |> System in living in sdb and sdc and sda is practically free.
> |>
> |> The root partition / is on sdb1 and all other vital partitions (/usr,
> |> swap, /var, /opt, /tmp and /home) are logical volumes on sdc1.
> |>
> |> My idea is to perform the new install on sda: sda1 will be the root
> |> partition /, and build a volume group sda2 for /usr, swap, /opt /tmp and
> |> /var; /home will be left where it is.
> |>
> |> Here begins my problem: I would like, after install retrieve (almost)
> |> all files from fc6 install. For /home, there is no problem, I think
> |> that, at install time, I will be be asked if I want to keep my /home
> |> volume wherever it is. But for other volumes (/var where my dns config
> |> is...) or /opt (where my texmf and some other out of standard are) I
> |> don't know how to get them once the new system will be installed.
> |>
> |> How could I access to these partitions for, now, they are mounted on
> |> /dev/mapper/.... but these devices are created at boot time in the /dev
> |> which is on sdb1 and, even if I mount /dev/sdb1 from the fresh install,
> |> I will be unable to access them because the new system is mounted on
> |> sda.....

- --
François Patte
UFR de mathématiques et informatique
Université Paris Descartes
45, rue des Saints Pères
F-75270 Paris Cedex 06
Tél. +33 (0)1 44 55 35 61
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