Re: [linux-lvm] Mirroring

[Chris Anderson <chris@alwan.com>]

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A James Lewis wrote:

> What you're asking is can LVM be used in conjunction with MD, and is this
> the correct solution or is LVM/MD going to merge or LVM duplicate MD's
> work??

What is MD and where can I get it?  And why would we not want LVM to do this?
That is what a logical volumne manager is for? Yes?

Please note that it a month veritas will be out for linux.  It will have these
options, I think maybe we should think about what options they have and maybe make
some plans for lvm.  I say "we" because I would love to help were I could.

>
>
> I'd like those answers too!!!!
>
> On Fri, 11 Feb 2000, Chris Anderson wrote:
>
> > Harald Milz wrote:
> >
> > > Chris Anderson <chris@alwan.com> wrote:
> > > > I have looked through the doc and I see that LVM stripes but how do you
> > > > setup a true mirror?  One hard dive mirrored to another hard drive (1 to
> > > > 1).
> > >
> > > It's more like one partition or logical volume mirrored against another
> > > one (not necessarily disks - you seem to be familiar with Novell). LVM
> > > can't do this. Use MD.
> >
> > I know veritas.  It has a SubDisk, Plex Volume setup.  A subdisk is part of a
> > disk and one or more subdisk make a Plex and one or more plexes make a
> > volume.  And a volume can be used as a mount point or whatever.
> >
> > So if a disk goes bad only plexes with use a subdisk from that disk are
> > down.  And if a volume has two plex only one need to be up to run.  Later the
> > plex can be re-joined back to the volume and the data is synched back to the
> > other plex.
> >
> > In a nut shell what happens when one disk goes down with LVM?  Can it be
> > setup to keep the volume up and alive and run and if so what is the best way?
> >
> > >
> > >
> > > --
> > > If you sit down at a poker game and don't see a sucker, get up.  You're
> > > the sucker.
> >

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