Re: [PATCH 000 of 5] md: Introduction

[Heinz Mauelshagen]

On Sat, Jan 21, 2006 at 01:13:11AM +0100, Lars Marowsky-Bree wrote:
> On 2006-01-21T01:08:06, Heinz Mauelshagen <mauelshagen@xxxxxxxxxx> wrote:
> 
> > > A dm-md wrapper would give you the same?
> > No, we'ld need to stack more complex to achieve mappings.
> > Think lvm2 and logical volume level raid5.
> 
> How would you not get that if you had a wrapper around md which made it
> into an dm personality/target?

You could with deeper stacking. That's why I mentioned it above.

> 
> Besides, stacking between dm devices so far (ie, if I look how kpartx
> does it, or LVM2 on top of MPIO etc, which works just fine) is via the
> block device layer anyway - and nothing stops you from putting md on top
> of LVM2 LVs either.
> 
> I use the regularly to play with md and other stuff...

Me too but for production, I want to avoid the
additional stacking overhead and complexity.

> 
> So I remain unconvinced that code duplication is worth it for more than
> "hark we want it so!" ;-)

Shall I remove you from the list of potential testers of dm-raid45 then ;-)

> 
> 

-- 

Regards,
Heinz    -- The LVM Guy --

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
Cluster and Storage Development                   56242 Marienrachdorf
                                                  Germany
Mauelshagen@xxxxxxxxxx                            +49 2626 141200
                                                       FAX 924446
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