Varnish ICP?

[Andreas Røsdal]

On Fri, 11 May 2007, Poul-Henning Kamp wrote:
> In message <20070511165155.D37842 at verden.pvv.ntnu.no>, =?ISO-8859-1?Q?Andreas_R
> =F8sdal?= writes:
>
>> Hello!  Is ICPv2 included in the plans for varnish 2.0?
>
> No.
>
> Our thinking on ICP in general is that a two-layer setup is a better
> use of HW-resources.

It would be interesting to know a little more about how to configure 
Varnish in a two-layer setup. I guess this would be of interest to others 
deploying varnish as well.

Would such a two-layer setup be comparable to a squid cache hierarchy in 
surrogate mode?

For instance, if you had four servers with equal hardware resources to 
use as Varnish caches, how should these be optimally configured?

- A two-layer setup would mean a hierarchy with two siblings in 
two layers.
- An one layer setup would mean four siblings in one layer.

If I understand this correctly, the two-layer setup would have a lower 
mean time before failure, but a higher cache hit ratio, than the one layer 
setup.



  - Andreas