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Old 02-01-2008, 02:39 PM
Adam Hough
 
Default lvm re-install strategy

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.

Option 2:
If you can move the data that is on /dev/sda to some other location (and
do not forget to exportvg or removevg it from you Fedora 6 install).
then you can repartition /dev/sda so that it has 2 partitions which are
a /boot ext3 partition and a LVM partition. During the install have
Fedora 8 installed to a new logical volume in the new volume group (you
could add /dev/sda to the old volume group as well to have all the
drives in the same volume group) on /dev/sda. You will have to edit the
grub.conf in /dev/sda1 to setup chain loading to /dev/sdb1.


On Tue, 2008-01-29 at 12:16 +0100, François Patte wrote:
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> Timothy Murphy a écrit :
> | François Patte wrote:
> |
> |> I have an fc6 install with LVM and want install f8.
> |
> | I don't see any problem.
>
> If this refers to the preceeding, I agree....
> |
> |> 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.....
> |
> | I haven't understood the details of your setup.
> | But couldn't you run Knoppix (or one of the other Linux-on-a-CD's)
> | and activate your LVM partitions with "vgchange -a y" (as root)?
>
> This I don't know, I think that I could do something like this using the
> rescue cd.
>
> | Won't "lvdisplay" then tell you the names of the corresponding devices?
>
> The problem is there:
>
> ~ ~]# lvdisplay
> ~ --- Logical volume ---
> ~ LV Name /dev/fedora/usr
> <snip>
>
> This /dev is the one which is currently working on the fc6 (so, in sdb1
> partition).
>
> Once f8 will be installed on sda, there will be a /dev for f8 on sda1
> but even if I mount /dev/sdb1 (which an ext3 partition, the "/dev" of
> this fc6 partition will be empty because the device "fedora" is created
> during the fc6 boot....
>
> So, I don't know how to mount the "old" logical volumes.
>
>
> |
> |> Another (related) question: is it possible, through grub, to have the 2
> |> systems (f8 and fc6) working? I mean, not at the same time but possibly
> |> choosen at boot time? what are the magic command to give before
> |> installing the bootloader, during the installation of f8, in order to
> |> get this possibility.
> |
> | Again, I'm not sure of your exact question,
> | but it is certainly possible to have grub stanzas
> | corresponding to different versions of Fedora.
>
> Yes, of course.
>
> |
> | Personally, I would not rely on the Fedora installation
> | to setup things as I desire.
> | I would install F8, and then re-write grub.conf
> | to contain one or more entries for FC-6.
> | You shouldn't need to re-install grub, as far as I can see.
>
> I was just wondering if I could write some "grub.conf" at install time...
>
> Thanks for your answer.
>
> - --
> François Patte
> UFR de mathématiques et informatique
> Université Paris Descartes
> Tél. +33 (0)1 44 55 35 61
> http://www.math-info.univ-paris5.fr/~patte
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--
Adam Hough <adam@gradientzero.com>

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