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Re: [linux-lvm] Mirror between different SAN fabrics

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 postfinance ch
<mathias herzog postfinance ch> wrote:

> From: linux-lvm-bounces redhat com
> [mailto:linux-lvm-bounces 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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