Quote:
Originally posted by Gruntled
Micha,
When the host starts to grow very large, all of the domain lookups are going to the primary DNS machine, where the secondary machine is sitting around, twiddling its thumbs. So, many people like to swap their DNS to use the secondary first, hoping to get their surfers to the site slightly faster.
HTH
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Once more -- it is not true. Secondary nameserver is not a backup nameserver. Both nameservers (or more) are replying the queries because they are queried randomly -- depends on the algorithm of resolver library on the client side, which one is queried the first. So if you run two nameservers and the secondary nameserver is not running you are in troubles because some clients queried secondary nameserver first.
It can be simply proved. If you have access to both -- primary and secondary nameserver which are authoritative for the same zone, turn the query logs on and compare them. You will see that the secondary nameserver is getting decent percentage of the clients' queries directly -- independently on the fact if primary nameserver is running or not.