lvm re-install strategy

[François Patte]

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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
sdb2+sdc1?

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
myself....

<snip>

> 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
http://www.math-info.univ-paris5.fr/~patte
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