[ovirt-users] Re: [ovirt-devel] Re: oVirt HCI point-to-point interconnection

Hi Alex, I have evaluated this approach using the latest version of oVirt Node. In principle I would like to follow the guidelines of oVirt development team, and adopt its best practices, trying to limit excessive customizations. So I installed oVirt Node on 3 hosts and I manually configured the two additional interfaces for the point-to-point interconnections on which then I configured Gluster. This was done very easily, and it works! I know that SDN is supported by oVirt, even if by default it is bridging to the outside. I have no experience with the SDN, but I realized that the VxLAN or maybe Geneve was the way to go, and now I also have your confirmation. Creating Geneve L3 point-to-point tunnels between the nodes, on which then configure an L2 overlay network shared by oVirt pool hosts and on which then move all internal oVirt communications. In first analysis this intervention seems structural, not trivial, I think it would be better to evaluate it carefully, and if interesting, write a best practice or better integrate the functionality in the solution. At the end the system must be stable and above all upgradable with traditional procedures. Stefano. Stefano Zappa IT Specialist CAE - TT-3 Technical Department Industrie Saleri Italo S.p.A. Phone:+39 0308250480 Fax:+39 0308250466 This message contains confidential information and is intended only for rightkicktech(a)gmail.com, ykaul(a)redhat.com, devel(a)ovirt.org, users(a)ovirt.org, sabose(a)redhat.com, sbonazzo(a)redhat.com, stirabos(a)redhat.com. If you are not rightkicktech(a)gmail.com, ykaul(a)redhat.com, devel(a)ovirt.org, users(a)ovirt.org, sabose(a)redhat.com, sbonazzo(a)redhat.com, stirabos(a)redhat.com you should not disseminate, distribute or copy this e-mail. Please notify Stefano.Zappa(a)saleri.it immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Stefano Zappa therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. If verification is required please request a hard-copy version. ________________________________________ Da: Alex K <rightkicktech(a)gmail.com&gt; Inviato: giovedì 28 giugno 2018 21:34 A: Stefano Zappa Cc: Yaniv Kaul; devel; users(a)ovirt.org Oggetto: Re: [ovirt-users] Re: [ovirt-devel] Re: oVirt HCI point-to-point interconnection Hi, Network virtualization is already here and widely used. I am still not sure what is the gain of this approach. You can do the same with VxLANs or Geneve. And how do you scale this? Is it only for 3 node clusters? Alex On Thu, Jun 28, 2018, 11:47 Stefano Zappa <Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it>> wrote: Hi Yaniv, no, the final purpose is not to save a couple of ports. The benefit is the trend to convergence and consolidation of the networking, as already done for the storage. The external interconnection is a critical element of the HCI solution, a configuration without switches would give more soundness and more independence. If we think about HCI as the transition of IT infrastructure from hardware-defined to software-defined, the first step was virtualization of the servers, the second step was storage virtualization, the third step will be virtualization of networking. Of course this also has an economic benefit, reduce the total cost of ownership and traditional data-center inefficiencies. We suppose a very traditional and simple external uplink, we can use the interfaces integrated into the motherboard. This will not be critical for the integrity of the our HCI solution, this will not require broad bandwidth and low latency, this will be used exclusively to interconnect the solution with the outside world, then with a traditional ethernet switch. We suppose to give more attention to the point-to-point interconnection of the three nodes, using 100 or 200 GbE cards for direct interconnection without switches. The hypothetical purchase of these 3 cards will not be cheaper, sure, but it will be twenty times less than introducing expensive switches that will certainly have more ports than necessary. Thanks for your attention, Stefano. Stefano Zappa IT Specialist CAE - TT-3 Technical Department Industrie Saleri Italo S.p.A. Phone:+39 0308250480 Fax:+39 0308250466 This message contains confidential information and is intended only for ykaul@redhat.com<mailto:ykaul@redhat.com>, sabose@redhat.com<mailto:sabose@redhat.com>, sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>, devel@ovirt.org<mailto:devel@ovirt.org>, users@ovirt.org<mailto:users@ovirt.org>. If you are not ykaul@redhat.com<mailto:ykaul@redhat.com>, sabose@redhat.com<mailto:sabose@redhat.com>, sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>, devel@ovirt.org<mailto:devel@ovirt.org>, users@ovirt.org<mailto:users@ovirt.org> you should not disseminate, distribute or copy this e-mail. Please notify Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it> immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Stefano Zappa therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. If verification is required please request a hard-copy version. ________________________________________ Da: Yaniv Kaul <ykaul@redhat.com<mailto:ykaul@redhat.com>> Inviato: mercoledì 27 giugno 2018 16:20 A: Stefano Zappa Cc: Sahina Bose; Sandro Bonazzola; devel@ovirt.org<mailto:devel@ovirt.org>; users@ovirt.org<mailto:users@ovirt.org> Oggetto: Re: [ovirt-devel] Re: [ovirt-users] oVirt HCI point-to-point interconnection On Wed, Jun 27, 2018 at 11:26 AM, Stefano Zappa <Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it><mailto:Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it>>> wrote: The final purpose is strictly targeted to your HCI solution with 3-node gluster replication. Can you explain to me what the benefit is? You need a switch anyway (for uplink), so the 'cost saving' is that you can use a 4 port (?) switch and do not need 6 ports? Y. Stefano Zappa IT Specialist CAE - TT-3 Technical Department Industrie Saleri Italo S.p.A. Phone:+39 0308250480 Fax:+39 0308250466 This message contains confidential information and is intended only for sabose@redhat.com<mailto:sabose@redhat.com><mailto:sabose@redhat.com<mailto:sabose@redhat.com>>, sbonazzo@redhat.com<mailto:sbonazzo@redhat.com><mailto:sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>>, stirabos@redhat.com<mailto:stirabos@redhat.com><mailto:stirabos@redhat.com<mailto:stirabos@redhat.com>>, users@ovirt.org<mailto:users@ovirt.org><mailto:users@ovirt.org<mailto:users@ovirt.org>>, devel@ovirt.org<mailto:devel@ovirt.org><mailto:devel@ovirt.org<mailto:devel@ovirt.org>>. If you are not sabose@redhat.com<mailto:sabose@redhat.com><mailto:sabose@redhat.com<mailto:sabose@redhat.com>>, sbonazzo@redhat.com<mailto:sbonazzo@redhat.com><mailto:sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>>, stirabos@redhat.com<mailto:stirabos@redhat.com><mailto:stirabos@redhat.com<mailto:stirabos@redhat.com>>, users@ovirt.org<mailto:users@ovirt.org><mailto:users@ovirt.org<mailto:users@ovirt.org>>, devel@ovirt.org<mailto:devel@ovirt.org><mailto:devel@ovirt.org<mailto:devel@ovirt.org>> you should not disseminate, distribute or copy this e-mail. Please notify Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it><mailto:Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it>> immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Stefano Zappa therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. If verification is required please request a hard-copy version. ________________________________________ Da: Sahina Bose <sabose@redhat.com<mailto:sabose@redhat.com><mailto:sabose@redhat.com<mailto:sabose@redhat.com>>> Inviato: mercoledì 27 giugno 2018 10:15 A: Sandro Bonazzola Cc: Stefano Zappa; Simone Tiraboschi; users@ovirt.org<mailto:users@ovirt.org><mailto:users@ovirt.org<mailto:users@ovirt.org>>; devel@ovirt.org<mailto:devel@ovirt.org><mailto:devel@ovirt.org<mailto:devel@ovirt.org>> Oggetto: Re: [ovirt-users] oVirt HCI point-to-point interconnection The point to point interconnect is something we have not explored - I think this limits the solution from scaling out to more nodes. On Wed, Jun 27, 2018 at 1:22 PM, Sandro Bonazzola <sbonazzo@redhat.com<mailto:sbonazzo@redhat.com><mailto:sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>><mailto:sbonazzo@redhat.com<mailto:sbonazzo@redhat.com><mailto:sbonazzo@redhat.com<mailto:sbonazzo@redhat.com>>>> wrote: Simone, Sahina, can you please have a look? 2018-06-07 9:59 GMT+02:00 Stefano Zappa <Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it><mailto:Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it>><mailto:Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it><mailto:Stefano.Zappa@saleri.it<mailto:Stefano.Zappa@saleri.it>>>>: Good morning, I would like to kindly ask you a question about the feasibility of defining a point-to-point interconnection between three ovirt nodes. Initially with the idea of optimizing the direct communications between the nodes and especially the gluster communications, and so it would seem quite easy, then evaluating a more complex configuration, assuming to create an overlay L2 network on the three L3 point-to-point, using techniques like geneve, of which at the moment I have no mastery. If the direct routing of three nodes to interconnect the public network with the private overlay network was not easily doable, we could leave the private overlay network isolated from the outside world and connect the VM hosted engine directly to the two networks with two adapters. This layout with direct interconnection of the nodes without switches and a shared L2 overlay network between the nodes may in future be contemplated in future releases of your HCI solution? Thank you for your attention, have a nice day! Stefano Zappa. [cid:609f1f14-f74e-489f-b86d-08647efc6d1c] Stefano Zappa IT Specialist CAE - TT-3 Industrie Saleri Italo S.p.A. 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