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Mirror Log threshold?

  • October 4, 2013 at 9:57 am

    #395610

    I have a mirrored setup, my principal server becomes unresponsive and the witness and mirror decide to failover to the mirror, so now roles change and the mirror is now the prin.

    Transactions happen on new principal for 30 minutes lets say, and communication is restored with the old principal server, which now knows it is the mirror through some magic.

    1. Would the new mirror start syncronizing immediately with the new principal(2ndary server)?

    2. Is there a point, or threshold of transactions, that after that point, the mirror would not be allowed to be resyncronized?

    I hope that makes sense.

    In a related scenario, if I took a backup from one physical location(full and tran) and shipped that backup to a geographically seperate physical location, say (100gb db), how could I create a mirror at the 2nd location given that say 48 hours have past since that backup was taken?

    Is it possible?

    Thanks

  • October 9, 2013 at 3:56 pm

    #1657332

    alanspeckman (10/4/2013)

    I have a mirrored setup, my principal server becomes unresponsive and the witness and mirror decide to failover to the mirror, so now roles change and the mirror is now the prin.

    Transactions happen on new principal for 30 minutes lets say, and communication is restored with the old principal server, which now knows it is the mirror through some magic.

    1. Would the new mirror start syncronizing immediately with the new principal(2ndary server)?

    2. Is there a point, or threshold of transactions, that after that point, the mirror would not be allowed to be resyncronized?

    1. yes

    2. if the mirror was not available the log of the new principal would fill until you ran out of drive space, you have until then to get the mirror back.

    In a related scenario, if I took a backup from one physical location(full and tran) and shipped that backup to a geographically seperate physical location, say (100gb db), how could I create a mirror at the 2nd location given that say 48 hours have past since that backup was taken?

    Is it possible?

    Thanks

    you would have to apply all logs (with norecovery) taken on the primary to that point to the secondary and then set up mirroring

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