Question for a first install

Hello,

I've joined the wpmudev premium community.
I have 2 questions about the multi-db :

I have actually 600 blogs (but only 100 active max). Should I choose 16 or 256 ?

define ('DB_SCALING', '16');

How can I find these parameters ? What is the class c ? Everything will be on my one and only dedicated server.

//------------------------------------------------------------------------//
//---DC IPs---------------------------------------------------------------//
//------------------------------------------------------------------------//
// Usage: add_dc_ip(IP, DC)
// EX: add_dc_ip('123.123.123.', 'dc1');
add_dc_ip('123.123.123.', 'dc1');

Thanks for your help