Some good tutorial about DNS, where?

now I have 2 web servers and I have problem with my DNSs, when my 1. web server down I have also 2. web server down Some good tutorial about DNS, where? something is not good in my DNS setup, this is not good, when one of my servers down other servers must work normal!

Now I have 2 web servers and I have:
1. server:
ns1.mydomain.com
ns2.mydomain.com

2. server:
ns3.mydomain.com
ns4.mydomain.com

- both of my servers use same domain for DNSs!

This is problem now when I have only 2 web servers what will be when I buy more servers Some good tutorial about DNS, where? I must fix this now!

Somebody know some pages where I can find good tutorial about this problem, about DNSs and DNS solutions or somebody can write here about that?

On my servers I use cPanel!

Thanks.

 

 

 

 

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