Re: raid1 mdadm v's lvm

On Thu, Oct 18, 2007 at 03:19:50PM +0200, Martin Marcher wrote:
> 2007/10/18, Alex Samad <alex@samad.com.au>:
> > On Thu, Oct 18, 2007 at 01:39:21PM +0200, Martin Marcher wrote:
>
> > > IMHO lvm mirroring is useless. if I do LVM (on servers) I have
> > > multiple drives and i tend to trust mdadm more in this field than LVM
> > > (don't ask me why - I couldn't logically say why).
> >
> > it would be good to here from somebody that uses lvm mirroring. I would like
> > to access some of that extra space that would be made available if I did
> > mirroring at the lvm level instead of the md level.
>
> wouldn't that defeat the purpose of mirror?
There is some data I would like on raid1 and some I don;t care about, ie ripped music, video's, stuff I backup off computer and offsite, if I lose a days worth of stuff who cares, or if I have to re rip it who cares. Hopefully HD smart will warn me of a failing disk and I can use lvm to more the lv to another pv.

For the important stuff I do want raid1.

LVM just seems more flexible to cutting up and managing raw space than mdadm, with the later I have to create to pools of space raid1 and raid0 and I have to define it at the initial setup, with lvm all the space goes to a vg and I can define it at creation of the lv

>
> I think if I do mirror my data I _want_ it to be redundantent (how do
> you spell that?). I wouldn't want to risk something by gaining a few %
> of space, rather I'd like to be assured that if a disk dies I can
> simply replace it and LVM will not even take care about that (hotplug
> with mdadm) - on the other hand I never looked into mirroring LVM
> because mdadm is just made for that. Correct me if I'm wrong.

yep, it seems like lvm is slower (!?) than mdadm mirroring, so I will stick with raid1 under lvm

>
> martin
>
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