Re: [PATCH 000 of 5] md: Introduction

[Heinz Mauelshagen]

On Mon, Jan 23, 2006 at 11:26:01AM +0100, Lars Marowsky-Bree wrote:
> On 2006-01-23T10:44:18, Heinz Mauelshagen <mauelshagen@xxxxxxxxxx> wrote:
> 
> > > 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.
> 
> Ok, I still didn't get that. I must be slow.
> 
> Did you implement some DM-internal stacking now to avoid the above
> mentioned complexity? 
> 
> Otherwise, even DM-on-DM is still stacked via the block device
> abstraction...

No, not necessary because a single-level raid4/5 mapping will do it.
Ie. it supports <offset> parameters in the constructor as other targets
do as well (eg. mirror or linear).

> 
> 
> Sincerely,
>     Lars Marowsky-Brée
> 
> -- 
> High Availability & Clustering
> SUSE Labs, Research and Development
> SUSE LINUX Products GmbH - A Novell Business	 -- Charles Darwin
> "Ignorance more frequently begets confidence than does knowledge"

-- 

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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