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Wireless Networks Thread, 2 DC's - one getting hammered, one almost idle - why? in Technical; Ive got 2 domain controllers, both are DNS servers, both are DHCP servers. DHCP on each server gives out addresses ...
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    2 DC's - one getting hammered, one almost idle - why?

    Ive got 2 domain controllers, both are DNS servers, both are DHCP servers.
    DHCP on each server gives out addresses with itself as the primary DNS, so DNS should be roughly load balanced.

    But for logins etc, the second DC doesnt seem to get touched, CPU is always at under 10%, while the other one is normally 30 - 60%.
    Nothing different running between the machines, mostly same processes

    The first DC is the user documents server, which obviously contributes a fair bit, but the other one holds all the common area so there should be some load on that too.

    It just seems everything uses the first DC for logons, which slows things down greatly.

    I always thought now there are no PDC's and BDC's like there used to be and all DC's are equal, they should take some of the load each...obviously not

    Never really had to think about it before, but more and more additions to the network of course mean more traffic

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    Chafftech's Avatar
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    Re: 2 DC's - one getting hammered, one almost idle - why?

    The logons probably are baing load balanced between the DC's (have you made sure they see each other as secondary DNS server?)

    If you run all the user profiles from one server then it will get hammered more than the other (especially if they are roaming profiles).

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    It might be a network problem. Whats the connectivity like? Anything out of the ordinary setup? Wifi bridges? VLANs? firewalls? routers?

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Are both DC's configured as Global Catalogs? The Global Catalog holds data that permits network logon.

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Chafftech do you mean locally on the servers? No they only have themselves as their DNS servers
    And yes, profiles are all on that first server, however only 6th formers and staff have roaming profiles, the rest of the students are on mandatory, yet big classes are still taking ages to log on sometimes

    Geoff - Nothing out of the ordinary, no. No VLANs, all one subnet. Servers have gig links, each department has a gig link or 2 to their switches

    djm - yes both are GC's, although after reading on here about that last week they both may not be for much longer

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    If you run DCDiag on both DC's do you get any warnings or errors?

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Sidewinder: to be honest I think this is to be expected, especially considering the server also acts as the main file server.

    One relatively cheap option to increase network throughput would be to install a dual port GB nic and team the adapters.

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    One relatively cheap option to increase network throughput would be to install a dual port GB nic and team the adapters.
    I thought the problem was CPU usage not network throughput?

    How about a CPU upgrade? Is there a spare socket in the motherboard to go dual processor perhaps?

    The other thing would be to move the fileserving to another dedicated server specifically for that purpose.

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Quote Originally Posted by djm968
    Are both DC's configured as Global Catalogs? The Global Catalog holds data that permits network logon.
    I don't know where that myth came from, but it seems impossible to kill.

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    Re: 2 DC's - one getting hammered, one almost idle - why?


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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Only applies to forests with more than one domain though.

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Although it is true that the logon process does not require a GC, when a new user account attempts to log on, the GC is queried and authentication will fail unless cached credentials exit on the local computer. Exchange also uses the GC extensively.

    http://support.microsoft.com/default...b;en-us;216970

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Yes, in one domain in one location - you only have one Global Catalogue, but the other thing is about logging on. You don't need a GC available to log on.

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Quote Originally Posted by sidewinder
    Chafftech do you mean locally on the servers? No they only have themselves as their DNS servers
    And yes, profiles are all on that first server, however only 6th formers and staff have roaming profiles, the rest of the students are on mandatory, yet big classes are still taking ages to log on sometimes
    Yes I do mean locally on the servers. To aid balancing they should both see each other as secondary DNS. But I don't think this will make a massive difference to the problem you are experiencing (although something is better than nothing).

    It probably is a cpu / memory / hard disk bottleneck if you are sure that it is not network bandwidth related.

    How many user profiles do you have on that server
    1)in total
    2)logon at the same time

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    Re: 2 DC's - one getting hammered, one almost idle - why?

    Also what sort of size profiles are we talking about?

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