Additional Active Directory Server

Posted on 2010-01-06
Last Modified: 2013-12-05
Hi Everyone.

What is the advantage of installing AD on multiple servers
Is it purely as a backup or can it help with network access speeds etc.

Look forward to your comments.
Question by:YZF-R1
    LVL 21

    Accepted Solution

    Lots of reasons!

    1. Backup
    2. Division of FSMO roles
    3. Speed. You will want to put DCs on distant sites if your domain consists of multiple WANs
    LVL 74

    Assisted Solution

    by:Glen Knight
    Mainly for backup purposes. If your DC goes down and you have another one then you still have a domain.
    If it goes down and you don't have another one then you have lost your domain if you cannot recover it.

    Also if you make your backup DC a Global Catalogue it will also provide authentication, and whilst this isn't load balanced it will take "some" load off the other server.
    LVL 22

    Assisted Solution

    by:Brian B (TBone2K)
    Only a very small organization should try and get by on one DC. Otherwise if you have a DC failure with no backup you are dead in the water and can't do pretty much anything at all.

    It also helps balance the load and allows you to distribute the various roles between the two.
    LVL 57

    Assisted Solution

    by:Mike Kline
    I would argue that even the smallest organization should have two DCs.  The cost of a second DC is so little these days  it's hard to imagine why anyone would go with only one DC.
    We have seen enough questions on here where people only had one DC and that went's not a good situation.
    LVL 74

    Expert Comment

    by:Glen Knight
    Absolutely agree with Mike.
    We should always have 2 the hardware requires for a DC is so minimal there is no excuse.

    If you have ever had a single DC domain fail you would know what I mean, its a lot of hard work otherwise!
    LVL 18

    Assisted Solution

    If you are running a business and using AD, you should have at least two 2DCs to avoid interruption. If only one DC and even you have good backup, you are expected to have interruption.

    In addition to redundancy for DCs, it could also serve as a redundancy for DNS/DHCP as these name and IP services are quite common in a Window enviornment that usually get installed and configured along with DCs.
    LVL 3

    Author Closing Comment

    Thanks All

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