i have heard of people having "issues" with 64 bit centos 5 and cpanel. although i have heard none for centos 4 64 bit.
i was going to choose 5 but i was recommended not to.
although i only got 4gb of ram.
i think it would be better off having a single system than multiple to make one system..
its like adding 3 hard drives to your pc and raid 0 them with your current hd.
each hard drive you add increases the risk one will fail. (and if one fails they all fail)
not sure if a cluster can sustain failure of one whole machine. or parts of multiple machines or not....
but it just sounds so complicated... and usually most simple method is better.....
as for the hard drives...
what do you plan on doing with them?
like a few in raid 1/5/10 for main drive. then a few large in raid 1 for backup or like 6-8 of them in raid 10 for the entire thing?
and budget? (personally id just go with raptors....)
as my debate in the other thread about raptors vs 15k sas drives....
for the price of 2 15k sas drives. you can get like 5.5 150gb raptors..... so round that up to 6.
raid 1 the sas drives. (mirror = no gain in performance really. just redundancy..)
raid 10 the 6 raptors. (3 for mirror 3 for stripe)
you get redundancy just like the sas. but you get the benefit of the stripe as well.
(1v1 the sas will win.)
but if you compare prices. when you can get like 3 raptors for price of one sas 15k..... there is no point in it really. you would be better off with the raptor.