[linux-lvm] [Fwd: boot from lvm volume]

[linux-lvm] [Fwd: boot from lvm volume]

[Michael Marxmeier]

Forwarded message from Michael Nittmann <corporate@ncincwi.com>

-------- Original Message --------
Subject: boot from lvm volume
Date: Sat, 08 Jul 2000 00:07:03 -0500
From: Michael Nittmann <corporate@ncincwi.com>
Organization: NCinc, Inc.
To: linux-lvm-approval@msede.com

Is it yet possible to boot from an LVM volume?
A big advantage of LVM is the live resizing of volumes. Especially
after
installing I would like to collapse / and have as many directories in
fact as file systems on LVMs as possible.
The big advantage is a very fast recovery time, and also a quick
change
of the kernel, e.g. keeping all /etc config files in place (production
/etc/ mounted over sysgen /etc after sysgen/etc is merged into
production /etc).
I like also mirrored / .

Is anyone working on a logical volume manager that supports Raid 1-5?
(well, raid0 is the lvm itself, concatenation across physical media).

I am not on the list, please copy me in.

Thanks

Mike

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Re: [linux-lvm] [Fwd: boot from lvm volume]

[Rolf Jakob]

Hello,

> Is it yet possible to boot from an LVM volume?
AFAIK no. I use a small partition for the kernel, an initrd image and
the lilo.conf which is later mounted as /boot.
So when the system is up the / filesystem is a logical volume and can
be resized online like all the other filesystems I use.
Lilo boots the kernel from that partition, loads an initial ramdisk
and executes the linuxrc script. In this script the needed modules are
loaded (ide.o or the SCSI modules and the lvm module), the volume group
is activated and by writing the major/minor number of the boot logical
volume ( I use the first logical volume as the root LV ) to
/proc/sys/kernel/real-root-dev the kernel will mount that one as the
new root filesystem.
I use that for five different systems now. My plannings were to use the
boot partition as a rescue system as well but I did it only on one
system (proof of concept, but I found out that rescue floppies are enough
for me).

> I like also mirrored / .
Hmm, that would mean that the master boot record should be mirrored as well,
otherwise you would loose your installed lilo. I haven't tried that yet.

Rolf
-- 
Rolf Jakob at home (rjakob@duffy1.franken.de)
WWW : http://www.franken.de/users/duffy1/rjakob (KDE-Utils and CCS)

Re: [linux-lvm] [Fwd: boot from lvm volume] Is ther

[Philippe Lefèvre]

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Hello,

I'm very interested in using LVM for the root partitions (I use Redhat 6.2) as
I can do with IBM AIX.

I would like to make a rootvg containing some LVs with /var /tmp /bin /usr
/home for example, then make a datavg for SGBD, datas and so on.

As I plan to update my production system running 2.2.16 to 2.4.0 as soon this
new kernel is available, I did some tests with the new kernel-2.4.0.test2 and
lvm-0.8final patched. It seems to work perfectly but I was unable to find a way
to put rootvg under LVM.

I understood that you use the initrd way to getting up your first VG but before
that, how can you do to put /var /usr /sbin etc... under LVM. I mean, changing
the filesystem tag (-> 0x8e) then creating PV, VG and LVs will distroy all
datas on disk !!

Is there any way to create LVs before installing my RH distribution ?

Did I missed something ? Is there any documentation that could explain how to
do this ?


NB: LVM is integrated into my kernel and is not a module.


Could you please help me on that subject ?

Thank you in advance,

PhiL


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