[CentOS] Server to server communication

[D Steward]

> How often does the data change and how critical is it to have real-time 
> results.  Web sites often have thousands of people getting copies of the 
> same thing, or at least computed from the same values even if they are 
> the same only for a short period of time. 
The servers will exchange sensitive data hopefully with a latency of <
50ms.
Ping time between them is 20ms.

> One approach is to put 
> memcached between your web application and the database for extremely 
> fast repeated access to the same data. It is just a cache layer, though, 
> you still need a persistent database underneath. 
> http://www.danga.com/memcached/
> 
Ahh, thanks. I forgot about memcached. I am presently using some
in-memory MySQL tables, but I'll have to benchmark this against
memcached.
But the 2nd server was procured to relieve the CPU load on the main one.
Even with a 16-way Opteron, this situation would have had to be faced
eventually.

It looks to me like OpenAMQ will be the ultimate solution
I'm amazed that RedHat with a finger in almost every opensource pie
hasn't backed this or come out with their own competing option, since it
appears to tie in very nicely with clusters.