From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx2.redhat.com (mx2.redhat.com [10.255.15.25]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id kBRKlq2l028847 for ; Wed, 27 Dec 2006 15:47:52 -0500 Received: from wx-out-0506.google.com (wx-out-0506.google.com [66.249.82.236]) by mx2.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id kBRKlp6L030785 for ; Wed, 27 Dec 2006 15:47:51 -0500 Received: by wx-out-0506.google.com with SMTP id s11so5377331wxc for ; Wed, 27 Dec 2006 12:47:51 -0800 (PST) Message-ID: <859a78260612271247m7b14c247n7f420c7ebea5b906@mail.gmail.com> Date: Wed, 27 Dec 2006 14:47:51 -0600 From: "Matt P" Subject: Re: [linux-lvm] Mirror between different SAN fabrics In-Reply-To: <4339128.1167221745260.JavaMail.mailer@post.ch> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <859a78260612220751n3f0570abgdf4e865fabeb90d5@mail.gmail.com> <4339128.1167221745260.JavaMail.mailer@post.ch> Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development 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 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 > > Sicherheitshinweis: > Dieses E-Mail von PostFinance ist signiert. Weitere Informationen finden Sie unter: > https://www.postfinance.ch/e-signature. > Geben Sie Ihre Sicherheitselemente niemals Dritten bekannt. > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > >