I understand the design for Unity Failover having two front end servers with no Exchange on them and having a third server for the message store.
I have been asked by a customer if Unity will ever have redundancy at the message store level. I have heard some rumors about Unity VMO going to a different file structure\database other than Exchange. And if the plan is to also get to a redundant message store level, do you happen to know a time frame?
Clustering does not provide true message store redundancy for there is still only 1 copy.
Clustering would provide "high availability" but it is far from true redundancy in my opinion. You still have the single point of failure in the shared storage and only 1 copy of the stores.
There are many products that provide true exchange replication with database replication giving you live acces to a true writable copy of the exchange databases. We have been using Exchange clustering for some time but these products make sense both from a cost and functionality/availaibility perspective..
hopefully Cisco can test this and at some point provide support for at least one of these products.
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