fuel-dev team mailing list archive

[Andrey Danin <adanin@xxxxxxxxxxxx>]

Thank you, Miroslav.


On Thu, May 22, 2014 at 4:19 PM, Miroslav Anashkin
<manashkin@xxxxxxxxxxxx>wrote:

> 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 <adanin@xxxxxxxxxxxx>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 <mmcroberts@xxxxxxxxxxxx>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
>>>
>>> --
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>>>
>>>
>>
>>
>> --
>> Andrey Danin
>> adanin@xxxxxxxxxxxx
>> skype: gcon.monolake
>>
>> --
>> Mailing list: https://launchpad.net/~fuel-dev
>> Post to     : fuel-dev@xxxxxxxxxxxxxxxxxxx
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>> More help   : https://help.launchpad.net/ListHelp
>>
>>
>
>
> --
>
> *Kind Regards*
>
> *Miroslav Anashkin**L2 support engineer**,*
> *Mirantis Inc.*
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>
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>
>


-- 
Andrey Danin
adanin@xxxxxxxxxxxx
skype: gcon.monolake