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
