From emayoral at arsys.es Fri Nov 3 08:15:17 2017 Content-Type: multipart/mixed; boundary="===============0165329729735789432==" MIME-Version: 1.0 From: Eduardo Mayoral To: users at ovirt.org Subject: Re: [ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers Date: Fri, 03 Nov 2017 09:15:14 +0100 Message-ID: In-Reply-To: CAAq+RfYZT9nYvPh3NttwrRu1JRb+1qhzihGi+WETrO8+vFcEng@mail.gmail.com --===============0165329729735789432== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------54D2274BE68ED5ED9B86230D Content-Type: text/plain; charset=3Dutf-8 Content-Transfer-Encoding: 8bit Exporting the VMs to an export storage domain on the first server, copying the files to another export storage domain on the second server and importing it should work. What kind of problem did you find? As for the order of doing things, my first oVirt lab was a 3-node setup with gluster (oVirt version 4.0). I found this guide helpful: https://www.ovirt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluste= r-storage/ I see there is a new version of it: https://www.ovirt.org/blog/2017/04/up-and-running-with-ovirt-4.1-and-gluste= r-storage/ If I understand correctly you plan to re-use the server you already have. I think you will probably find it much easier have to export your VMs, re-deploy and import your VMs back. It means some downtime, but you seem very constrained on the hardware available and there is not much room to manouver... Good luck! Eduardo Mayoral Jimeno (emayoral(a)arsys.es) Administrador de sistemas. Departamento de Plataformas. Arsys internet. +34 941 620 145 ext. 5153 On 03/11/17 08:39, Artem Tambovskiy wrote: > Thanks Eduardo! > > I think I can find a third server to build a glusterFS storage. So the > first step will be to install a self-hosted engine on the new server > and start building a glusterFS storage. IS there any easy way to > migrate existing 5 VM's running on the second bare-metal oVirt host, > right? I found a little bit tricky moving oVirt backups between the > hosts (at least I failed to replicate the existing VM's on the second > server). > > Regards, > Artem > > > > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral > wrote: > > For HA you will need some kind of storage available to all the > compute nodes in the cluster. If you have no external storage and > few nodes, I think your best option for storage is gluster , and > the minimum number of nodes you will need for HA is 3 (the third > gluster node can be metadata-only, but you still need that third > node to give you quorum, avoid split-brains and have something > that you can call "HA" with a straight face. > > Eduardo Mayoral Jimeno (emayoral(a)arsys.es ) > Administrador de sistemas. Departamento de Plataformas. Arsys interne= t. > +34 941 620 145 ext. 5153 > > On 03/11/17 08:10, Artem Tambovskiy wrote: >> Looking for a design advise on oVirt provisioning. I'm running a >> PoC lab on single bare-metal host (suddenly it was setup with >> just Local Storage domain) and=C2=A0 >> no I'd like to rebuild the setup by making a cluster of 2 >> physical servers, no external storage array available. That are >> the options here? is there any options to build cheap HA cluster >> with just 2 servers?=C2=A0 >> >> Thanks in advance! >> >> Artem >> >> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> > > --------------54D2274BE68ED5ED9B86230D Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 8bit

Exporting the VMs to an export storage domain on the first server, copying the files to another export storage domain on the second server and importing it should work. What kind of problem did you find?

As for the order of doing things, my first oVirt lab was a 3-node setup with gluster (oVirt version 4.0). I found this guide helpful:

https://www.o= virt.org/blog/2016/08/up-and-running-with-ovirt-4-0-and-gluster-storage/

I see there is a new version of it:

https://www.o= virt.org/blog/2017/04/up-and-running-with-ovirt-4.1-and-gluster-storage/

If I understand correctly you plan to re-use the server you already have. I think you will probably find it much easier have to export your VMs, re-deploy and import your VMs back. It means some downtime, but you seem very constrained on the hardware available and there is not much room to manouver...

Good luck!

Eduardo Mayoral Jimeno (emayora=
l(a)arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 03/11/17 08:39, Artem Tambovskiy wrote:

Thanks Eduardo!

I think I can find a third server to build a glusterFS storage. So the first step will be to install a self-hosted engine on the new server and start building a glusterFS storage. IS there any easy way to migrate existing 5 VM's running on the second bare-metal oVirt host, right? I found a little bit tricky moving oVirt backups between the hosts (at least I failed to replicate the existing VM's on the second server).

Regards,

Artem
On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral <emayoral(a)arsys.es> wrote:
For HA you will need some kind of storage available to all the compute nodes in the cluster. If you have no external storage and few nodes, I think your best option for storage is gluster , and the minimum number of nodes you will need for HA is 3 (the third gluster node can be metadata-only, but you still need that third node to give you quorum, avoid split-brains and have something that you can call "HA" with a straight face.
Eduardo Mayoral Jimeno (emayoral(a)arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153
On 03/11/17 08:10, Artem Tambovskiy wrote:
Looking for a design advise on oVirt provisioning. I'm running a PoC lab on single bare-metal host (suddenly it was setup with just Local Storage domain) and=C2=A0

no I'd like to rebuild the setup by making a cluster of 2 physical servers, no external storage array available. That are the options here? is there any options to build cheap HA cluster with just 2 servers?=C2=A0

Thanks in advance!

Artem

=
_______________________________________________
Users mailing list
Users(a)ovirt=
.org
http://lists.ovirt.org/mailman/listinfo/users

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