[vnfpool] 答复: Virtualized vs. physical network functions

[Zongning <[e-mail]>]

Thanks, Linda and Pedro. I will put some words in PS draft to reflect this.

-Ning

发件人: vnfpool [mailto:[e-mail]] 代表 PEDRO ANDRES ARANDA GUTIERREZ
发送时间: 2014年5月28日 20:04
收件人: Linda Dunbar; [e-mail]
主题: Re: [vnfpool] Virtualized vs. physical network functions

Hi Linda,

Yes, it would do it!

Best,
/PA
Dr. Pedro A. Aranda Gutiérrez

Technology Exploration -
Network Innovation & Virtualisation

mailto:[e-mail]
Telefónica, Investigación y Desarrollo
C/ D. Ramón de la Cruz,84
28006 Madrid, Spain

Fragen sind nicht da, um beantwortet zu werden.
Fragen sind da, um gestellt zu werden.
Georg Kreisler

De: Linda Dunbar <[e-mail]<mailto:[e-mail]>>
Fecha: martes, 27 de mayo de 2014 23:20
Para: PEDRO ANDRES ARANDA GUTIERREZ <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Asunto: RE: [vnfpool] Virtualized vs. physical network functions

Pedro,

I see your point. Do you think adding the following sentence at the end of the Section 1 can address the issues you brought up?

"It worth noting that the proposed mechanism also works for unprotected hardwarebased service functions."


Linda
-----Original Message-----
From: vnfpool [mailto:[e-mail]] On Behalf Of PEDRO ANDRES ARANDA GUTIERREZ
Sent: Saturday, May 10, 2014 2:00 AM
To: [e-mail]<mailto:[e-mail]>
Subject: Re: [vnfpool] Virtualized vs. physical network functions

Hi Linda,
Congratulations for reading through a coding mess :-) Answers inline,

Best, /PA

Dr. Pedro A. Aranda Gutiérrez

Technology Exploration -
Network Innovation & Virtualisation

mailto:[e-mail]
Telefónica, Investigación y Desarrollo
C/ D. Ramón de la Cruz,84
28006 Madrid, Spain

Fragen sind nicht da, um beantwortet zu werden.
Fragen sind da, um gestellt zu werden.
Georg Kreisler



El 10/05/14 00:40, "Linda Dunbar" <[e-mail]<mailto:[e-mail]>> escribió:

>Pedro,
>
>Are you saying that the physical boxes also have chance to fail, why
>VNFpool emphasizes so much on Virtualized Network Functions?

Yes, physical boxes also tend to fail (in the worst possible moment, if you believe in Murphy’s law :-) )

>Here is my take on this issue:
>
>It is very likely that the physical devices, either compute or storage
>devices, have embedded restoration & protection mechanism.

OK, but at what price? If you want to keep costs at a reasonable level, you will probably go to a virtualised environment, with HW that is more cost effective and with simpler mechanisms for resilience.

>Take your storage example, many storage arrays have their own embedded
>protection mechanism. When a server write/read from a storage array, it
>doesn't know if the data is from stand-by devices.

Once again, I agree. But while many do, not all have it necessarily. This is also a question of costs. Thus we can’t take protection for granted in ‘discrete’ boxes.

>Whereas, in the virtualized environment, functions instantiated on
>virtual mechanism doesn't have its own protection mechanism. Therefore,
>the "high availability" requires the "coordination" among all the other
>instances, hopefully in the standard way.

Completely agree. And hopefully we can use the same standard mechanisms in cost effective physical (as opposed to virtualised) devices, too.

>Linda

My point is that I see network functions independently of the device that implements them and whether this is a physical device or a virtualised function. IMHO, hybrid environments tend to have the advantage of lowering the entry barrier: continue using what you have deployes and press the last dime out of it while introducing next-gen solutions in a virtualised environment that is more cost-effective than your current system. This ‘soft’ introduction also alleviates the pressure of having to cope with something completely new on network admins.

Best,/PA


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