Re: [gentoo-user] grub and what happens exactly when booting.

[Alan McKinnon]

On Mon, 19 Sep 2011 13:51:03 +0700
Pandu Poluan <pandu@××××××.info> wrote:

> On Sep 19, 2011 11:12 AM, "Dale" <rdalek1967@×××××.com> wrote:
> >
> > Peter Humphrey wrote:
> >>
> >> On Saturday 17 September 2011 12:34:54 Dale wrote:
> >>
> >>
> >> > Does LVM make the heads move around more or anything like that?
> >> > I'm
> >>
> >> > just thinking it would depending on what lv are on what drives. I
> >>
> >> > dunno, just curious.
> >>
> >>
> >> I haven't thought about that, but my first impression is that LVM
> >> won't
> make any great difference. The data get stored where the data get
> stored, if you see what I mean. How they're organised is in the
> implementation layers. (Am I making sense? It's getting late here.)
> >>
> >>
> >> --
> >>
> >> Rgds
> >>
> >> Peter Linux Counter 5290, 1994-04-23
> >>
> >>
> >
> >
> > Yea, I see the point.  I was even thinking that if LVM is on
> > multiple
> drives and the a lv was spanned across two or more drives, then it
> could even be faster.  Data spanned across two or more drives could
> result in it reading more data faster since both drives are
> collecting data at about the same time.
> >
> > But then again, it depends on how the data is spread out too.  I
> > guess it
> is six of one and half a dozen of the other.
> >
>
> I'm not sure if LVM by itself implement striping. Most likely not
> because LVM usually starts with 1 HD then gets additional PVs added.
> Plus there's the possibility that the second PV has a different size.
>
> I might be wrong, though, since all my experience with LVM involves
> only one drive.


LVM does do striping according to the man page. I've never tried it,
mostly because LVM is the wrong place to do that IMHO.

Use RAID for that instead and leave LVM to do what it's good at -
managing storage volumes


-- 
Alan McKinnnon
alan.mckinnon@×××××.com