New to Exchange - Exchange Clustered

Posted on 2007-07-27
Last Modified: 2010-03-06
When we say "I am setting up a cluster for my exchange server", what does it mean? Could you provide some articles?
Question by:VBdotnet2005
    LVL 13

    Expert Comment

    Clustering is a part of high avilability solutions.
    see this webcast
    LVL 23

    Expert Comment

    by:Malli Boppe
    A cluster is a group of computers, called nodes that function as a single computer/system to provide high availability and high fault tolerance for applications or services.
    LVL 27

    Expert Comment

    As was stated earlier, clusters provide high availability and fault tolerance. Also the administrative tasks are more complex.
    LVL 4

    Accepted Solution

    in layman's terms...

    you have 2 physical machines in a cluster environment.  one is being primary or active node (when talking cluster terms, it is called NODE) and the second is passive node.  both nodes talk and share information simultaneously in real time but only one node is active that everyone access it.

    on top of these physical node, is a virtual node or cluster name.  that's the name that everyone sees as or you configure your outlook clients to and point to it.

    in HA environment, when your physical active node is down, the passive node is automatically up with a slight delay of 30 seconds to a minute for switch over.  users will hardly notice any difference.  this gives you chance to repair, fix, resolve, upgrade or whatever the situation is on active node.  

    this gives you what is called High Availability or DR instance in place where there is no or minimal downtime.  this is just an overview and a 10,000 birds eye view of cluster servers and services.  there is a lot more nitty gritty than this.

    as stated above by my peers, it is a better solution but a lot more administrative tasks especially when it comes to patching and updates/upgrade.

    i am just trying to simplify things in plain english than high tech technical terms.  i hope this sheds some light in addition to what is mentioned above.
    LVL 4

    Expert Comment

    I am glad I was of some assistance.  I hope this helps you understand the basics of Clustering and what it entails to HA environment.

    Good Luck.

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