[Fwd: Partitionable RAID support in Breezy]

[Fabio Massimo Di Nitto]

Hi Jane and Daniel,

Jane Weideman wrote:
> Hi all,
> 
> Can you respond to this person please?

sure.

> 
> -------- Forwarded Message --------
> From: Daniel Swarbrick <daniel at pressure.net.nz>
> To: janew at ubuntu.com
> Subject: Partitionable RAID support in Breezy
> Date: Sun, 26 Jun 2005 02:02:31 +1200
> 
> Hello,
> 
> I hope you can direct my suggestion to the appropriate person (and that
> it doesn't get filtered as junk!).
> 
> I've just read how Breezy intends to push LVM2, and suspect that many
> people already run LVM2 to achieve the end result of being able to
> partition an MD device. I think relatively few people realise that the
> 2.6 kernel can already partition an MD device. Since this results in a
> much cleaner set up than having multiple MD devices, one for each
> partition, without the overhead and complexity of LVM2, I think it would
> be a good idea for Ubuntu.

The idea of partitioning raid is ok, but there are different usecases for LVM2
that RAID cannot easily cover (like partition resize).
Performing these kind of operation (like shrink/grow) can be much more difficult
and prone to errors than with LVM.

Also LVM can span across devices of different sizes without any problem, while RAID
(other than linear/raid0) can't. So you are limited on what you can aggregate.

Fabio

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