BIND primary + secondary, how and how many

[Iñaki Martínez]

HI!!!

 Well the subject is a bit confused....... sorry.....

 I have 4 servers (each in a diferent location and network), each of
them have a domain with Web (apache), ftp, mail (sendmail) and bind.

 NOW *each* server has configured Bind with its own domain as primary
and the rest of domains (of the other three servers) as slaves.

 Then each server is primary of the domain it owns and is secondary of
the rest os the domains.

 More graphically (NOW):

 Server     primary    slaves
 ---------  ---------  -------------------------
 Server1    domain1    domain2, domain3, domain4
 Server2    domain2    domain1, domain3, domain4
 Server3    domain3    domain1, domain2, domain4
 Server4    domain4    domain1, domain2, domain3


 Well, my question is:

 Is this an optimal configuration???

 Or it is better to configure ONE server to be primary of ALL domains
and the rest of the servers to configure them as secondary domain
servers.

 Server     primary    slaves
 ---------  ---------  -------------------------
 Server1    domain1    
 Server2               domain1, domain2, domain3, domain4
 Server3               domain1, domain2, domain3, domain4
 Server4               domain1, domain2, domain3, domain4



 Another question is:

 What about if a primary server (any server first case and server1
second one) is down???

 How do the secondaries respond or are been accessed????


 Thanks in advance for any help??????