Re: [PATCH 000 of 5] md: Introduction

[Heinz Mauelshagen]

On Fri, Jan 20, 2006 at 11:57:24PM +0100, Lars Marowsky-Bree wrote:
> On 2006-01-20T19:36:21, Heinz Mauelshagen <mauelshagen@xxxxxxxxxx> wrote:
> 
> > > Then 'dmraid' (or a similar tool) can use 'dm' interfaces for some
> > > raid levels and 'md' interfaces for others.
> > Yes, that's possible but there's recommendations to have a native target
> > for dm to do RAID5, so I started to implement it.
> 
> Can you answer me what the recommendations are based on?

Partner requests.

> 
> I understand wanting to manage both via the same framework, but
> duplicating the code is just ... wrong.
> 
> What's gained by it?
>
> Why not provide a dm-md wrapper which could then
> load/interface to all md personalities?
> 

As we want to enrich the mapping flexibility (ie, multi-segment fine grained
mappings) of dm by adding targets as we go, a certain degree and transitional
existence of duplicate code is the price to gain that flexibility.

> 
> 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"

Warm 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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