Additional Active Directory Server

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.
Who is Participating?
Joseph MoodyBlogger and wearer of all hats.Commented:
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
Glen KnightCommented:
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.
Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
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.
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Mike KlineCommented:
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.
Glen KnightCommented:
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!
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.
YZF-R1Author Commented:
Thanks All
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