Cluster on freeBSD 5.3

[BSD]

Hello,

One of my clients want a high performance computer with a high level of 
redundancy.

I was thinking of two solutions :

#######################
1. Installing 2 high perf computers :
#######################

This will involve buying 2 servers with the same level of disks, 
hardware RAID array, and software.
Regarding FreeBSD, I would install the software I need and sync the 
/etc and other vital soft using rsync.


#####################
2. Installing a high perf cluster :
#####################

There is a question regarding how to setup this cluster with a 
redundancy on every part of the system (hardware + software).
Has someone already been producing a high level cluster with FreeBSD ?
What hardware have you been using ?
What are the problems you are facing ?
Any pointer ?

---

The second question will be which of the two system will you use ?


Thanks for your answers.


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