[linux-lvm] Mirror between different SAN fabrics

[Matt P]

I guess I should have tested the functionality out before I made the
comment. It seems the ability to add a mirror after the fact is still
not available (in lvconvert or otherwise). I'm sure someone will
correct me if I wrong on that.

I did figure out a crazy way you could do it, but it's messy, even
with small number of PVs. It would impact performance and is probably
not feasible in reality.

I think the proper way would be to use mdadm. Setup software RAID1
prior to getting LVM involved...

On 12/27/06, mathias.herzog at postfinance.ch
<mathias.herzog at postfinance.ch> wrote:
>
> > From: linux-lvm-bounces at redhat.com
> > [mailto:linux-lvm-bounces at redhat.com] On Behalf Of Matt P
>
> > I can't think of any Volume Manager that would let you mirror
> > disks from 2 separate VGs...
> Maybe not from 2 separate VGs but they add an additional level to group
> PVs together. With HP-UX you can use "lvcreate -m -s g" to use different
> PV-groups for the mirror. With Tru64 as far as I know you can use a Plex
> to create a PV-group (should be similar with Veritas)
>
> > But other than that I wouldn't see why you couldn't use 2
> > different fabrics, they're just disks to LVM... If you're
> > having trouble managing 200+ PVs, just build the LV first
> > using only disks from 1 fabric, then make the second fabric
> > available/visible, and add a mirror using only those disks...
> > I think that would work...
> That's an idea, but when I'm adding 4 more disks (eg. disk1 and disk2
> from fabric1, disk3 and disk4 from fabric2), how can I tell LVM to
> mirror Disk1,2 to Disk3,4 and not to mirror Disk1 to Disk2?
>
> Regards Mathias
>
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