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From: "Matt P" <slarty.tj@gmail.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Mirror between different SAN fabrics
Date: Wed, 27 Dec 2006 14:47:51 -0600	[thread overview]
Message-ID: <859a78260612271247m7b14c247n7f420c7ebea5b906@mail.gmail.com> (raw)
In-Reply-To: <4339128.1167221745260.JavaMail.mailer@post.ch>

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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> _______________________________________________
> linux-lvm mailing list
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>

  reply	other threads:[~2006-12-27 20:47 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-20 14:01 [linux-lvm] Mirror between different SAN fabrics mathias.herzog
2006-12-22 15:51 ` Matt P
2006-12-27 12:15   ` mathias.herzog
2006-12-27 20:47     ` Matt P [this message]
2006-12-28  8:12       ` mathias.herzog
2006-12-28  8:49         ` Christian.Rohrmeier
2006-12-28 10:13           ` mathias.herzog
2006-12-28 10:55             ` Christian.Rohrmeier
2006-12-28 11:09               ` Graham Wood
2006-12-28 11:31                 ` Christian.Rohrmeier
2006-12-28 11:42                   ` Graham Wood
2006-12-28 11:52                     ` mathias.herzog
2006-12-28 18:19                       ` Ty! Boyack
2006-12-28 19:30                         ` Matt P
2006-12-28 22:02                           ` Ty! Boyack
2006-12-28 23:24                             ` Matt P
2007-01-03 16:30                               ` mathias.herzog
2007-01-05 12:27                               ` mathias.herzog
2006-12-29 13:10                             ` [linux-lvm] Filter the Swap Partition berthiaume_wayne

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