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Salvatore, Horms,
Thank you very much for your help ! I now have all what I need to start working,
and I will tell you if I encounter any problem or even for saying all is working
well.
Many thanks again for your greats job and advices,
best regards,
Laurent.
Horms wrote:
On Thu, Jan 22, 2004 at 02:19:00PM -0500, Salvatore D. Tepedino wrote:
On Thu, 2004-01-22 at 05:46, Laurent Neiger wrote:
An additional question : could you tell me if according to you it is a bad idea
to have such an architecture in production ? Versus HA w/ LB, there is twice
less machines, decreasing total cost and possible hardware failures, space
required, heat production, ... Am I wrong ?
There are other topologies that scale better, but for most sites it
should work fine. I believe it was one of the people that know this much
better (Horms?) that said that separate directors would give better
throughput. He'd have to explain the specifics of that, but I'm sure
he's correct. I find the 'streamlined' config works best for people that
don't want to spring for the extra machines for directors. I used
separate directors in my last project as the client's machines were
windows boxes, plus I can now use these directors as directors for other
clients clusters with almost no setup required.
The best advice I can give is to test the configuration under load and
see if it meets your needs.
Horms would be much better at giving the reasons why one config would be
better than the other. He wrote the page, after all.
The only thing that you really need to consider is capacity.
If you have 2 nodes and one goes down then will that be sufficient
untill you can bring the failed node back up again? If so go for it.
Obviously the more nodes you have the more capacity you have -
though this also depends on the capacity of each node.
My thinking is that for smallish sites having the linux dierctor
as a machine which is also a real server is fine. The over head
in being a linux director is typically much smaller than that
of a real server. But once you start pushing a lot of traffic
you really want a dedicated pair of linux directors.
Also once you have a bunch of nodes it is probably easier to manage
things if you you know that these servers are real servers and
those ones are linux directors, and spec out the hardware as appropriate
for each task - e.g linux-directors don't need much in the way of
storgage, just CPU and memory.
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