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If you put 5000 inotes users on a cluster is performance better than if you put 2500 inotes users on two servers?2. When mail file is only being accessed by one person is there a point to put it in cluster? I can understand creating a cluster if more than one person is accessing the data/app.
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When do you create a clustered environment for mail?
Subject: When do you create a cluster for mail?
#1 and #2: What clustering gives you in a situation like this isn’t better all-around performance so much as it gives you more resilience and disaster recovery. Consider this situation: You have two servers, each with half of your 5000 users. It’ll give you about the same performance as a clustered setting with proper load balancing (automatically distributing users to one server or the other). The cluster may give you slightly poorer performance because of the additional overhead necessary to keep replica copies up to date, but I’ve never seen it be enough of a performance hit to matter. However, if one of the servers in the non-cluster scenario goes down (or if you have to take it down for maintenance), 2500 users can’t get their mail until you can get the server back up. In a clustered environment, they fail over to the other server and, although there may be a bit of a performance hit from the additional load, they might not notice that anything in particular is wrong.
#3: Complex question, but the big selling point for places I’ve been has been quick recovery from problems with individual servers.