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LVM over software RAID

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Tony Lawrence

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Nov 25, 2002, 5:57:05 AM11/25/02
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I started playing with LVM in RedHat 8.0. It's very nice that you can
configure this during the install, but what wasn't immediately obvious
was that you can do it on top of software raid, too. Basically, you
create your raid device(s) as usual, but instead of putting an ext3 fs
on /dev/md0 etc, you choose Physical Volume instead. Then you click LVM
and make the real filesystems on the Volume Group.

I wrote it up in detail at http://aplawrence.com/Linux/lvm.html for
those who are interested.


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Tony Lawrence
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sc...@_nospam_scottsavarese.com

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Nov 25, 2002, 9:16:20 AM11/25/02
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Tony Lawrence <to...@pcunix.com> wrote:
> I started playing with LVM in RedHat 8.0. It's very nice that you can
> configure this during the install, but what wasn't immediately obvious
> was that you can do it on top of software raid, too. Basically, you
> create your raid device(s) as usual, but instead of putting an ext3 fs
> on /dev/md0 etc, you choose Physical Volume instead. Then you click LVM
> and make the real filesystems on the Volume Group.

Last I heard you were not able to put /boot on an LVM volume. Is that still
the case?

Also, have you tried making your / volume and LVM volume as well. When I
did the setup using slackware I was told that it is a bad idea since
most emergency boot disks don't have lvm support and you will not have
access to your data.

Scott

Tony Lawrence

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Nov 25, 2002, 12:57:46 PM11/25/02
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scott@_nospam_scottsavarese.com wrote:
> Tony Lawrence <to...@pcunix.com> wrote:
>
>>I started playing with LVM in RedHat 8.0. It's very nice that you can
>>configure this during the install, but what wasn't immediately obvious
>>was that you can do it on top of software raid, too. Basically, you
>>create your raid device(s) as usual, but instead of putting an ext3 fs
>>on /dev/md0 etc, you choose Physical Volume instead. Then you click LVM
>>and make the real filesystems on the Volume Group.
>
>
> Last I heard you were not able to put /boot on an LVM volume. Is that still
> the case?

Yes.

>
> Also, have you tried making your / volume and LVM volume as well. When I
> did the setup using slackware I was told that it is a bad idea since
> most emergency boot disks don't have lvm support and you will not have
> access to your data.

You can put / into the LVM (and I did for the test machine) but for the
reasons you state, I wouldn't recommend it.

Markku Kolkka

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Nov 26, 2002, 8:35:18 AM11/26/02
to
scott@_nospam_scottsavarese.com writes:
> Last I heard you were not able to put /boot on an LVM volume. Is that still
> the case?

Yes.



> Also, have you tried making your / volume and LVM volume as well. When I
> did the setup using slackware I was told that it is a bad idea since
> most emergency boot disks don't have lvm support and you will not have
> access to your data.

The Red Hat 8 install disc rescue mode supports / in LVM.

--
Markku Kolkka
markku...@iki.fi

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