Re: Subject: [001/002 ] raid0 reshape

[Goswin von Brederlow <goswin-v-b@web.de>]

Greg Freemyer <greg.freemyer@gmail.com> writes:

> ==> What I mean by raid equivalent levels
>
> More and more arrays allow the user to simply say "give me a 100 GB
> logical volume with Raid 5 equivalent protection.  The array then
> looks at the drives it has available and puts together the necessary
> pieces.  As drives are added, removed it moves the data around under
> its own control, but maintains the raid equivalent protection.
>
> Especially when working with dozens of drives and lots of logical
> volumes it makes life much easier.  Admittedly it may come at a cost
> of not being able to specify raid levels with the specificity that
> mdraid currently allows.
>
> ==>
>
> The reason I ask if this is the goal is that doing so may factor into
> decisions about how reshaping is implemented.
>
> Greg

That really seems to scream for LVM to support more raid levels. It
already has linear, raid0 and raid1 support (although I have no idea
how device mapper raid1 compares to md raid1).

Those should be fleshed out more and also support raid 4/5/6 for what
you ask.

MfG
        Goswin