[maemo-developers] [maemo-developers] Re: Span filesystem across both SD cards?

[From: Jon Smirl]

On 2/1/07, Neil MacLeod <gmane at nmacleod.com> wrote:
> Jon Smirl wrote:
> > The ability already exists in Linux. You need to turn on device mapper
> > in your kernel and then use LVM2 or  EVMS.
> >
>
> Great! :) Unfortunately that's way over my head :)
>
> When you say "turn on" device mapper in the kernel, do you mean compile the kernel with device mapper enabled (or can it already be turned on somehow)? And is LVM2 or EVMS already available on the N800? And just what is device mapper?

My N800 isn't here yet. But you will probably need to build a new
kernel and turn on the config for device mapper. Or just look at the
modules on your current system, I think it is called dm.ko, it may
already be there. I haven't noticed any one building LVM2 or EVMS for
the Nokia.

Once you merge the cards with device mapper you will always have to
use them together. They will be useless individually.

Most people won't bother with all this work and limitations and just
buy 2GB or 4GB cards.

If you don't have to have files that are larger than a single volume,
you can just use a symlink to logically merge them any way you want.

-- 
Jon Smirl
jonsmirl at gmail.com