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  1. #1
    Join Date
    Jan 2006
    Posts
    2

    Unanswered: diff between engine failure and instance failure

    hi all

    my problem is :- i'm installing db2 in hacmp clustered env . the needed config is

    active-active mutual takeover cluster for 5 apps so i build 5 instances for each

    app i did this as i thought that i could run every app on one instance. the full

    scenario in the attached file . the problem is there exist instance failure case in

    which i could only transfer the only failed instance to the other node not all

    instances .

    thnx all alot
    Attached Files Attached Files

  2. #2
    Join Date
    Mar 2004
    Posts
    46
    Hi,

    It will help better if you provide the test scenarios/cases that you wish to cover and any background information on them. Also provide information on how you to intend to test them (or have tested for them).

    From what you are indicating, it seems that one of your instances failed and only THAT instanced failed over to the standy instance. With your configuration, this seems to be ok (but it seems you were expecting ALL instances to failover).

    Remember that "HA" is a very generic term - and can mean different things to different people (e.g. for Apps Arhitect it means his "browser" session should be tolerant to anything happening on the infrastructue). In the realm of DB2, HA can be implemented at the OS level (using clustering s/w or using DB2 HADR technology similar to Oracle's DataGuard). It seems you are using HADR.

    The more info you provide the better help we can provide.

  3. #3
    Join Date
    Jan 2006
    Posts
    2
    first of all thnx for ur response then
    i'll rebuild my Q? i need to know only if there exist case that it could happen that only one instance failed and failed over and the others remains up and running (e.g. in my sketch i've nodeA with db2inst1 , ..3 ,..5 active and nodeB with db2inst2,..4 active is there exist such a case that db2inst2 in nodeB fails and failed over on nodeA and db2inst4 in nodeB remains up and running in nodeB)
    thnx alot

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