Questions on Repadmin

Mikhail Firsov 1,756 Reputation points
2022-10-19T12:32:01.537+00:00

Hello!

While troubleshooting a replication issue with my domain controllers today I've been puzzled by several questions that came into my mind and to which I don't currently have answers. Please help me clarify the following:
I have a script that daily reports the repadmin /replsummary ... information and the delta shown in those reports were usually between 1m-58m (including yesterday, 10/18/2022) but today the reports started looking differently (the reports from domain controller KM02, host names have been changed for the picture):
252041-q1.png

Q1) How come the today's delta is >60 days for KM02 (and also for VM-DC-01) if this delta was only 52m yesterday? I thought that if the problem - for example - has appeared yesterday (10/18/22) at ~10AM then the delta can't be more that 1 day... ???

Q2) Doesn't it look strange that there's a DNS lookup error for VM-DC-01 in the Source section but no errors in the Destination section of the report?

Q3) The main theory question: this article says:

*/bydest

Summarizes the replication status for all domain controllers that a given destination domain controller replicates from. This parameter does not display the source domain controller.*

  • as far as I understand it means the term "given destination domain controller" in this case is KM02 (the dc on which the script runs), and if I'm correct then I don't understand how to interpret the presense of KM02 in the Destination list: it means KM02 replicates from KM02? What am I missing here?

Thank you in advance,
Michael

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Accepted answer
  1. Gary Reynolds 8,811 Reputation points
    2022-10-19T20:41:32.12+00:00

    Hi Mikhail,

    As the tools is unable to connect to the destination server, the last replication time will be unknown and probably the reason why the delta has jumped from hours to days.

    The same is probably true about the Km02 error, the tools is probably try to connect the server and it fails and returns an error while checking the replication details and is just displaying the error. I would suggest fixing the name resolution issue first and see what results you get then.

    Gary.

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3 additional answers

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  1. Dave Patrick 329.1K Reputation points Microsoft MVP
    2022-10-19T12:37:36.247+00:00

    Might also check the System and DFS Replication event logs for clues.

    --please don't forget to upvote and Accept as answer if the reply is helpful--

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  2. Mikhail Firsov 1,756 Reputation points
    2022-10-19T12:42:50.207+00:00

    Hi DSPatrick,

    Thank you - I'll check them!


  3. Mikhail Firsov 1,756 Reputation points
    2022-10-20T08:32:02.65+00:00

    Hi all,,

    "As the tools is unable to connect to the destination server, the last replication time will be unknown and probably the reason why the delta has jumped from hours to days." - agree, I also thought about it!

    The thing that bothers me the most is that I don't understand the theory itself:

    "*/bydest

    Summarizes the replication status for all domain controllers that a given destination domain controller replicates from. This parameter does not display the source domain controller.*

    What does mean

    "Destination DSA
    KM02 > 60days... The RPC server is unavailable."

    ...in the repadmin's output on KM02 itself? According to "the replication status for all domain controllers that a given destination domain controller replicates from" it means KM02 was trying to replicate from KM02 and failed because of the RPC error - complete nonsence :(((