Nameservers & maxing uptime by using different ones

Hi,

I've got a site that i'd like to have on two servers therefore if one goes down the other one can kick in.

if i set my nameservers as

Primary: ns1.hostA.com
Secondary: ns1.hostB.com


will this work, to my understanding if primary ns fails it goes to secondary.

If this will work will there be any problems with emails
how do i define that serverA handles all email

thanks,

Shaun

 

 

 

 

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