Re: Distribution CPG Protocol

[Eric Dean <eric@crystalballinc.com>]

I believe that capacity management is a function of the CDN provider.  If
a CDN peer consistently is unable to deliver content with sufficient QoS
then you stop peering with them...or with that portion of the CDN.

QoS mechanisms have been hammered out within the IETF and rarely
implemented except for some internal traffic engineering.  I have never
seen a bilat (contract or protocol) that has QoS properties.  
 
Exchanging capabilities and exchanging capacity are two completely
different considerations.  It will also make for extremely chatty
protocols because content will continuously shift.  
 
In addition, disk capacity is rarely a determining factor.  I/O, CPU,
memory are much more of a determining factor and are micro-dynamic.
   
On Wed, 10 Jan 2001, Oliver Spatscheck wrote:

> 
> 
> 
> Eric Dean writes:
>  > 
>  > I also concur that QoS is an offline process...if even quantifed at all.  
>  > 
> 
> 
> Eric,
> 
> 	please clarify for me. Do you mean with QoS something as simple
> as space or bandwidth reservation or do you mean something as complicated
> as the detailed properties reserved bandwidth has to adhere to?
> 
> I am in complete agreement with you that the "properties of reserved
> bandwidth" should be negotiated off line. However, the availability
> and reservation should be an online process.
> 
> Oliver
> 

Eric Dean
President, Crystal Ball Inc.
W 703-322-8000
F 703-322-8010 
M 703-597-6921