But GRE encapsulation decreases speed of VMs' communication and decreases CPU utilization of the Compute and Controller nodes. Correction: Increases CPU utilization.
On Thu, May 22, 2014 at 11:24 AM, Andrey Danin <[email protected]> wrote: > Nova-network is a simple legacy network manager. It can operate with > predefined Private IP spaces only. > If you don't want to split your VMs to an isolated groups (tenants) you > can choose Nova-network with FlatDHCP. In this case you will have one big > tenant for all VMs. > If you want use multiple tenants and all of them contain approximately the > same number of VMs you can use Nova-network with VLANManager. In this case > the number of the tenants will be predefined and all the tenants will have > equal size of Private IP space. You must decide about these two numbers > (max number of tenants and Private IP space size) before starting > deployment. Also you must set up appropriate VLANs on your underlying > network equipment. > > Neutron is a modern and more complicated network manager. It can not only > separate tenants but decrease requirements for underlying network (physical > switches and topology) and gives a great flexibility in Private IP spaces > manipulation. You can create Private IP spaces with different size and > manipulate them on the fly. > Neutron with VLAN like Nova-network with VLANManager requires a predefined > max number of tenants value and underlying network equipment configuration. > With Neutron with GRE you are not restricted with max number of VLANs and > you can spawn a realy huge number of tenants. But GRE encapsulation > decreases speed of VMs' communication and decreases CPU utilization of the > Compute and Controller nodes. So if don't need realy fast interconnections > between VMs, don't want to predetermine max number of tenants, and don't > want to configure your network equipment you can choose Neutron + GRE. > > > On Wed, May 21, 2014 at 9:41 AM, Meg McRoberts <[email protected]>wrote: > >> Does anyone have notes about "considerations" for choosing >> between nova-network, neutron, and the two topologies each >> supports? >> >> Similarly, what can we tell people about choosing between CentOS >> and Ubuntu for the host OS on the nodes? >> >> I'm trying to do a quick save on the "Planning Guide" for 5.0. I'm >> sure we can improve on everything when we have more time... >> >> Thanks again, >> Meg >> >> -- >> Mailing list: https://launchpad.net/~fuel-dev >> Post to : [email protected] >> Unsubscribe : https://launchpad.net/~fuel-dev >> More help : https://help.launchpad.net/ListHelp >> >> > > > -- > Andrey Danin > [email protected] > skype: gcon.monolake > > -- > Mailing list: https://launchpad.net/~fuel-dev > Post to : [email protected] > Unsubscribe : https://launchpad.net/~fuel-dev > More help : https://help.launchpad.net/ListHelp > > -- *Kind Regards* *Miroslav Anashkin**L2 support engineer**,* *Mirantis Inc.* *+7(495)640-4944 (office receptionist)* *+1(650)587-5200 (office receptionist, call from US)* *35b, Bld. 3, Vorontsovskaya St.* *Moscow**, Russia, 109147.* www.mirantis.com [email protected]
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