Windows 2008 FailOver Cluster

Posted on 2012-09-03
Last Modified: 2012-09-04
Dear Team,

                       While i am configuring Fail over clustering having a doubt that the difference between Single instance application and multiple instance application and example for these two type of applications. Please provide support these.
Question by:columbuseng
    LVL 39

    Expert Comment

    by:Krzysztof Pytko
    This is mostly related with databases applications :)

    Single instance means:
    If database app uses database and one node would fail then there is short outage because database is initialized on another node. Changes are executed only on active node with database

    Multiple instance means:
    If database app uses database and one node would fail then there is no outage because database is initialized on both nodes. Changes are executed on each database instance concurrently. So, resource is moved to another node where database contains the same data.


    Author Comment

    Hi Krzysztof,

                         Can u tell the example apps which works on single instances and multiple instances. Thanks in advance.
    LVL 39

    Accepted Solution

    Yes of course,

    any interface between SQL and Oracle databases. Application name does not matter because it is only program which uses databases.

    Short example of apps which may be used as single and multi instances:
    - WSUS
    - SCCM

    as you can see, everything running on SQL and Orcale may be used as single or mutli if license dos not prohibit that


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