[linux-lvm] FW: LVM

[Heinz J . Mauelshagen]

On Tue, Jun 25, 2002 at 02:11:39PM +0000, James Hawtin wrote:
> On Tue, 25 Jun 2002 bscott at ntisys.com wrote:
> 
> > On Tue, 25 Jun 2002, at 8:58am, Montgomery Mouw wrote:
> > > I was just wondering if I mount 5 drives using LVM and say the forth drive
> > > dies, do I lose the data only on that forth drive or do I lose the data on
> > > the whole mount (all 5 drives data)?
> >
> >   In general, you will lose everything.
> >
> >   Technically: A drive is used to create a PV (Physical Volume).  One or
> > more PVs is used to create an LV (Logical Volume).  If the drive containing
> > a PV fails, that PV becomes unavailable.  If an LV needs a PV, and that PV
> > is unavailable, the LV will become unavailable as well.
> >
> 
> I thought changes were planned or done so that if a PV failed the vg could
> be force mounted and only the lvs on the unavailable PV would not be
> available....

As Alasdair said that support will show up later in LVM2.
It is in unstable LVM1.1 already.

See the other RAID > 0 thread on this list if you want to have disk redundancy
in order to avoid such SPOFs.

BTW: LVM2 will support mirroring directly later this year.

> 
> James
> 
> 
> 
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen at Sistina.com                           +49 2626 141200
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