>Our goal is to make all 3 domain controllers w/ Active Directory
what's the point of AD? this is a corporate system or a public mail system?
>and share the External raidbox for data storage.
what RAID? 5? 0+1 is recommended for speed.
Run the imail spool (logging + mail queue) and the mailbox storage on
separate controllers/disks.
>I am also planning to run Imail on all 3 servers and storing the
>messages on the raidbox. I think this will be okay since the
>clustering will take care of data access to the raidbox.
So the raidbox becomes both a single point of failure AND single
point of contention for all user logins and mailbox access. For all
the money you are going to spend on hardware and software, your are
ending up with a non-redundant, high-contention system.
You are running the mailbox storage over the LAN into one server
rather than on the much faster local disk storage of the 3 mailbox servers.
>All comments are welcome...
You're headed for trouble, assuming the big bucks you are going to
spend is indicative of 10's or 100's of 1000's of mailboxes and a
several 100,000 msgs/day.
You should also look at 2 IMGate boxes to provide external anti-spam,
anti-mail bomb, DNS validations, MX redundancy, and send/receive
off-loading separate from your mailbox servers.
Len
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