none
Active directory intersite replication minimum polling interval is 15 min or 7.5 min ?

    Question

  • in  MCITP 70-640 R2 Self-paced training kit , at page 593, we read :
    "The minimum polling interval is 15 minutes. With this setting, and using Active Directory’s
    default replication configuration, a change made to the directory in one site takes on average
    seven and a half minutes to replicate to domain controllers in another site."
    i don't underestand which one is true at last ? 15 min or  7.5 min ?
    i wonder at my exercises i noticed that replication occured between sites at about that 7.5 min  and didn't take  15 min.
    if that is 7.5 min , so what is the reason that they wrote 15 min ?
    Tuesday, October 11, 2011 7:11 AM

Answers

All replies

  • It should be 15 mint (inter-site), 15 seconds (intra-site).

    Note that replication ocours each 15 mint but that doesn't meant that an object that was created 1 minute before replication schedule starts, in this last case the object will be replicated as soon as the replication starts.

    Also note that the default can be changed to lower or higher values


    I hope that the information above helps you. This posting is provided "AS-IS" with no warranties or guarantees and confers no rights.
    Tuesday, October 11, 2011 8:36 AM
  • Inter-site replication is 15min(KCC also runs after every 15 for intersite) where as intrasite b/w DC's is 15 sec and for notifying the replication partners it is 3 sec. 

    http://technet.microsoft.com/en-us/library/cc755994%28WS.10%29.aspx

    http://blogs.technet.com/b/kenstcyr/archive/2008/07/05/understanding-urgent-replication.aspx

     

    Regards


    Awinish Vishwakarma

    MY BLOG:  awinish.wordpress.com


    This posting is provided AS-IS with no warranties/guarantees and confers no rights.
    Tuesday, October 11, 2011 8:40 AM
    Moderator
  • Hi,

    on the blog from Paul Berson you found a good explanation about the different types of replication (http://blogs.dirteam.com/blogs/paulbergson/archive/2011/04/06/active-directory-replication-types.aspx). There he wrote about the Intersite Replication:

    "Intersite Replication:

    DC’s between sites don’t follow the same set of rules that intrasite replication does. Changes between sites are setup on a schedule. The schedule is broken up in 15 minute increments, this schedule can also be set to only allow changes to occur at certain times of the day, thereby saving bandwidth at key points of time. The shortest time span for intersite to occur is 15 minutes and the longest is once a week. Note once replication begins between DC’s, the process will not stop until complete. So you won’t have to worry about incomplete replication activity due to time constraints."

    please check also out the following links about this topic.

    http://technet.microsoft.com/en-us/library/cc755994(WS.10).aspx

    http://technet.microsoft.com/en-us/library/cc759160(WS.10).aspx

     


    Martin Forch
    Tuesday, October 11, 2011 8:50 AM
  • I have a Blog that can help you to understand all the different replication types at:
    http://blogs.dirteam.com/blogs/paulbergson/archive/2011/04/06/active-directory-replication-types.aspx

    Hopefully this can help resolve some of your confusion.

    --
    Paul Bergson
    MVP - Directory Services
    MCITP: Enterprise Administrator
    MCTS, MCT, MCSE, MCSA, Security+, BS CSci
    2008, Vista, 2003, 2000 (Early Achiever), NT4
    http://www.pbbergs.com    Twitter @pbbergs
    http://blogs.dirteam.com/blogs/paulbergson

    Please no e-mails, any questions should be posted in the NewsGroup. This posting is provided "AS IS" with no warranties, and confers no rights.

    Tuesday, October 11, 2011 12:09 PM
    Moderator
  • at a maximum 15 min.
     
    the so called average is 7,5 min <----- forget this!
     
     
    remember the following as your rule of thumb: the minimum interval that can be configured is 15 min and the default is 180 min (3 hours). The interval is the max amount of time that needs to pass before the DCs (between sites) initiates inbound replication. So it will take the period of the interval or less before replications starts
     
     
     

    <o:p></o:p>

    Cheers,<o:p></o:p>


    (HOPEFULLY THIS INFORMATION HELPS YOU!)
    Jorge de Almeida Pinto | MVP Identity & Access - Directory Services

    -------------------------------------------------------------------------------------------------------
    * This posting is provided "AS IS" with no warranties and confers no rights!
    * Always evaluate/test yourself before using/implementing this!
    * DISCLAIMER:
    http://jorgequestforknowledge.wordpress.com/disclaimer/
    -------------------------------------------------------------------------------------------------------
    ################# Jorge's Quest For Knowledge ###############
    ###### BLOG URL:
    http://JorgeQuestForKnowledge.wordpress.com/ #####
    #### RSS Feed URL:
    http://jorgequestforknowledge.wordpress.com/feed/ ####
    -------------------------------------------------------------------------------------------------------
    <o:p></o:p>

    "john.s2011" wrote in message news:5405db8d-e2c2-4994-9c34-29ea7fa1ae22@communitybridge.codeplex.com...
    in  MCITP 70-640 R2 Self-paced training kit , at page 593, we read :
    "The minimum polling interval is 15 minutes. With this setting, and using Active Directory�??s
    default replication configuration, a change made to the directory in one site takes on average
    seven and a half minutes to replicate to domain controllers in another site."
    i don't underestand which one is true at last ? 15 min or  7.5 min ?
    i wonder at my exercises i noticed that replication occured between sites at about that 7.5 min  and didn't take  15 min.
    if that is 7.5 min , so what is the reason that they wrote 15 min ?

    Jorge de Almeida Pinto [MVP-DS] (http://jorgequestforknowledge.wordpress.com/)
    Tuesday, October 11, 2011 6:57 PM
    Moderator
  • Hi,

    I am agree with others, and to explan this issue, I should say that 15min is the theory replicate interval, and 7.5min is the practical relicate interval for AD information. Please refer to the thread below:

    http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/ec111059-7bca-4d6f-b36e-c1bf72a5d1e7

    They have the same theory.

    Best Regards,

    Yan Li


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    Wednesday, October 12, 2011 2:05 AM
    Moderator
  • I�??m sorry to I do not agree with that. The minimum configurable interval on a site link is 15 min. When it is configured to be 15 min, then replication may take place since the last time somewhere between 0 min (which is immediately) and 15 min. The so called calculated average is based upon the 0 min and 15 min (0 + 15 /2 = 7,5) and is pointless/meaningless value. It does not say anything concrete.
     

    <o:p></o:p>

    Cheers,<o:p></o:p>


    (HOPEFULLY THIS INFORMATION HELPS YOU!)
    Jorge de Almeida Pinto | MVP Identity & Access - Directory Services

    -------------------------------------------------------------------------------------------------------
    * This posting is provided "AS IS" with no warranties and confers no rights!
    * Always evaluate/test yourself before using/implementing this!
    * DISCLAIMER:
    http://jorgequestforknowledge.wordpress.com/disclaimer/
    -------------------------------------------------------------------------------------------------------
    ################# Jorge's Quest For Knowledge ###############
    ###### BLOG URL:
    http://JorgeQuestForKnowledge.wordpress.com/ #####
    #### RSS Feed URL:
    http://jorgequestforknowledge.wordpress.com/feed/ ####
    -------------------------------------------------------------------------------------------------------
    <o:p></o:p>

    "Yan Li_" wrote in message news:a14389e2-1716-4dbc-9d89-d5188f50901a@communitybridge.codeplex.com...

    Hi,

    I am agree with others, and to explan this issue, I should say that 15min is the theory replicate interval, and 7.5min is the practical relicate interval for AD information. Please refer to the thread below:

    http://social.technet.microsoft.com/Forums/en-US/winserverDS/thread/ec111059-7bca-4d6f-b36e-c1bf72a5d1e7

    They have the same theory.

    Best Regards,

    Yan Li


    Please remember to click �??Mark as Answer�?� on the post that helps you, and to click �??Unmark as Answer�?� if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

    Jorge de Almeida Pinto [MVP-DS] (http://jorgequestforknowledge.wordpress.com/)
    Wednesday, October 12, 2011 4:39 AM
    Moderator
  • Hi Jorge,

    I do agree with you, maybe that I am not make me clear to be understood.

    This is really a issue relating calculate, the replication time is 0-15, so it is acctually 7.5min.

    Best Regards,

    Yan Li


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    Wednesday, October 12, 2011 9:05 AM
    Moderator