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Mark wrote:
Maybe I am misinterpreting this, but it sounds like each mailbox is assigned to
exactly one realserver?
So you have distributed the mailboxes for load-balancing, but is there any
redundancy if one of the boxes goes down?
Nope, your not misinterpreting anything. With mail you can't really
have the type of redundancy you can have with say a webserver serving
out content. The problem is that imap doesn't like to be distributed.
The only way is to do it over something like iSCSI or fiberchannel or
some other enterprise level storage medium. What we are doing is to
distribute load and to provide some redundancy. If one mail box goes
down then we bring up the hot spare, but most of our mail boxes still
stay up. Also if one has a failed RAID, then we can move all the mail
boxes off of it and bring it down, repair the raid, then bring it back
up and move the mail boxes back. It really offers more flexibility and
does increase the redundancy on a site level.
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