Fail Over Server

I am in the process of purchasing a couple new Windows servers. I'm not sure what I should get as of yet; however, my goal is to have a main server and the second server as a fail over server. The server will act as a domain controller as well as a file server and possibly do DHCP and DNS. That would be the extend of it. Is there any way possible that in the case that one server goes down the other one kicks in automatically and everybody will still be working as normal and be able to access all their files with the latest updates? Any help would be greatly appreciated.
Thanks!
TechGuy_007Asked:
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Kash2nd Line EngineerCommented:
You need a Hyper V - (virtualization) and Replication enabled.

http://blogs.technet.com/b/yungchou/archive/2013/01/10/hyper-v-replica-explained.aspx

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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
What size is the environment? How many users?

Depending on the size Hyper-V replica, as mentioned, with two VMs configured on the primary host and replicated to the secondary would do.

Or, if the company is large enough one could set up a cluster. We utilize clustered Storage Spaces (2 nodes 1 JBOD). Flexibility and scalability are definitely a part of these solutions.
TechGuy_007Author Commented:
We're looking at about 20 computers and around 16 users.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Then a better idea may be a good backup regimen with a known good backup.

Veeam or ShadowProtect are two options for VM backup Veeam backs up at the host level while SP backs up at the guest level.

Setting up Hyper-V replica may be a possibility but one still needs a good backup.

If they are truly cost conscious, $1Ks/Hr for downtime, then an Asymmetric Cluster (2 nodes 1 JBOD) would be an inexpensive way to give them fault tolerance across hardware components. Our smallest client for this setup is an accounting firm at 15-18 seats.
Kash2nd Line EngineerCommented:
you can use 2 inexpensive fujitsu tx150 servers with virtual machines and replication on them.
16 users is not huge and it can be handled by any entry level server.

however, if you have plans for future expansion then let us know and we will provide you info on better future proof hardware
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