[linux-lvm] once again about 2.6 kernel

[linux-lvm] once again about 2.6 kernel

[Valentine Kouznetsov]

Hi,
I had a look at lvm mailing list about kernel 2.6
questions. So far I understood that in order to run
2.6 kernel with LVM2 on a system which previously run
2.4 kernel with LVM1 you need
1) patch 2.4 kernel with device-mapper patch
2) use new LVM2 tools (LVM2.2.00.07) which need to be
installed separetly on the system to allow
simulteneously use LVM1 and LVM2

Is it correct?

I have only two additional questions. Does it
necessary to patch 2.4 kernel (I found only 2.4.21
patches not 2.4.22)? Is any way to remove existing
LVM1, come back to usual situation without LVM on 2.4
system, install 2.6 and create a new LVM. 

Thanks,
Valentine.


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Re: [linux-lvm] once again about 2.6 kernel

[Mike Williams]

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On Wednesday 15 October 2003 14:08, Valentine Kouznetsov wrote:
> Hi,
> I had a look at lvm mailing list about kernel 2.6
> questions. So far I understood that in order to run
> 2.6 kernel with LVM2 on a system which previously run
> 2.4 kernel with LVM1 you need
> 1) patch 2.4 kernel with device-mapper patch
> 2) use new LVM2 tools (LVM2.2.00.07) which need to be
> installed separetly on the system to allow
> simulteneously use LVM1 and LVM2
>
> Is it correct?

Not from what little I know.
LVM2 can read LVM1 metadata, and convert it to LVM2. I've done this myself 
too, so I know it works! :)
Take a look at vgconvert.
The only problem you may have if you convert the metadata is not being able to 
go back to 2.4 without the patching you mention.

- -- 
Mike Williams
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[linux-lvm] Re: once again about 2.6 kernel

[Måns Rullgård]

Valentine Kouznetsov <vkuznet@yahoo.com> writes:

> I had a look at lvm mailing list about kernel 2.6
> questions. So far I understood that in order to run
> 2.6 kernel with LVM2 on a system which previously run
> 2.4 kernel with LVM1 you need
> 1) patch 2.4 kernel with device-mapper patch
> 2) use new LVM2 tools (LVM2.2.00.07) which need to be
> installed separetly on the system to allow
> simulteneously use LVM1 and LVM2

LVM2 doesn't require any changes to the disks.  It will understand the
LVM1 metadata.  You don't need to patch your 2.4 kernel to use
device-mapper in 2.6, either.  They can both peacefully coexist, as
long as your boot scripts run the right version of the tools.  A
somewhat ugly solution is to run both version, since only one of them
will do anything anyway.

-- 
M�ns Rullg�rd
mru@users.sf.net