director option

[soumitri at iitk.ac.in]

Hi,

I think option-2 below seems better or am I missing something with 
director concept.

1. As director and back-end in same server (broken) not recommended, I 
need minimum 4 servers (2 for director, 2 back-end IMAP). Indexes and 
mail must be in NFS shared storage(not optimal), as a user may land on 
any of the back-end servers (assuming no static mapping of user from 
pass DB).

2) Proxy_may in passDB (static mapping of users to servers makes 
balancing little partial but can be admin optimized) can achieve the 
above setup with 2 servers without director. Here indexes can be on 
their local disk (efficient)  and mail on shared storage (NFS).

Both case I can use RR DNS to get users IMAP traffic to front end. Any 
guidance on this is appreciated.

-- 
Sincerely,
Soumitri Mishra