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From: Herbert Rosenau 
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@Date: Mon, 13 Oct 2003 20:10:57 +0200
Subject: Re: New installation/recovery
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Klaus Roeckerath, M.D. wrote:
> ** Reply to message from Herbert Rosenau  on
Wed, 08 Oct 2003
> 20:00:40 +0200
> 
> 
>>Regarding LVM: Will it work to restore my
>>
>>>current partitions on the new drive once eCS is installed?
>>
>>When the backup is a logical copy (not an dumb image): yes.
>>When it is an image you have to use LVM to assign a drive letter to it 
>>after you've copied it onto disk.
> 
> 
> What do you mean by "logical copy"? 
> 
> The problem (or maybe it is no problem) I imagine is that my old system, once
> transferred to the new disk, will not recognize
"partitions", as what is
> vreated by eCS are "volumes". What I don't understand so far
is: *What* do I
> create with LVM and what will my old partitions do with it?

When you boots up eCS 1.1 and your OLD system is NOT LVM aware you 
have to use LVM to make it LVM aware. As this actions does nothing 
with the data but writes some extended information on some unused with 
fdisk places it is harmless.

In that way you creates volumes from partiton already existent. A 
volume is nothing than new logical level on top of the physical level 
you knows as partiton. When asked for a volume type you'll answer 
always compatible here because as the partiton already exist it should 
be compatible to your old system.

The trick is: you can hide any partiton you don't need access to 
currently. You unhides it again when you assignes again a drive letter 
(any from the list of free ones).

As your OLD system is NOT LVM aware it will still ignore the drive 
letters and even the new hide mechanism, as FDISK is not informed 
about that.

On other hand when you boots up the old system you may get trouble 
when the new disk is mounted and has primary partitons on it! That is 
because the old system will find any primary partiton on any disk 
attached and assign it a drive letter.

The new system (eCS) has no mechanism to assign drive letters 
automagically. So hiding partitons or assigning drive letters of your 
choice on them does not affect anything - except that a partiton that 
is hidden from eCS is not shown. So C: on the second disk shows as C: 
anyway, C: primary on the first disk is NOT shown when it is hidden 
from OS/2.

Be sure that your NEW disk is mounted as the first (the bootable) disk 
before you tries to install wincrap or linux! Because both knows 
nothing about the new scheme LVM uses to assign drive letters.

On the eCS CDs are not only readmes but an LVM.INF. You should read 
that before you starts to work with LVM. You may even boot from CD 1 
and go through the installer to the point where it will fire up its 
(mini)lvm and then when it is up press F1 and start reading.

LVM and MINILVM are designed in a way that you can even play around 
with it without changing anything on disk until you gets asked for:
When you ends LVM you will be asked if you are willing to save the 
changes. When you here says NO then not a single change gets written 
to disk.

Then don't wounder when no reboot is required. That is because LVM can 
do many things with the disk without reboot fdisk was unable to do.
-- 
Tschau/Bye

Herbert Rosenau
EDV Beratung & Programmierung
Lindelbrunnstr. 53a
76767 Hagenbach

Tel: 49-7273-919416
Fax: 49-7273-93072                     http://www.dv-rosenau.de/


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