How to fail over in a "safe" and smooth way ?

My layout is as follows:
I have a physical server that has 5 VMs - Host is Windows 2012 R2
1-Domain controller
1-Exchange (2013)
1-SQL Server 2012
1-Data Server
1-Application Server

I also have another Physical Server that has a replica of all of these VMs. Host is Windows 2012 R2
The replication is working fine.

I am running out of disk space on both physical servers and adding disk space need to turn off the servers which I cannot afford.

I got a new server (rented one for 1 week) with enough space.. and I did set it up as extended replicas from Server2.
and the extended replication is working fine.

Now I am about to take the step of "fail over" from the 3rd server (where I have the extended replication.)
But I have never done this and I am quite unsure about the steps...
Can someone please help me on how to do this "the safest" possible way ?
I was thinking of turning off my primary server (Host) and THEN fail over from the 3rd Server. THEN turn off the second server once all is ok.
If there is anything wrong,  I can then turn back ON the primary.
Is this the right way of doing things ?
Pierre AmmounIT ConsultantAsked:
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What are you using in terms of failover software?
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
You can run the failover steps from within Hyper-V Manager. There is no need to turn anything off.

Run your final sync and fail over to whichever server needs to have the VMs running. If that's tertiary then so be it.

Once the work is done on Server 1 reverse replication back from Tertiary to Server 1.

Once work on Server 2 has finished replication should pick back up where it left off (hopefully) and then Server 2 will pick up with Tertiary.

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Pierre AmmounIT ConsultantAuthor Commented:
"You can run the failover steps from within Hyper-V Manager"

Is there anything else than right-click and FailOver ?

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Peter HutchisonSenior Network Systems SpecialistCommented:
For domain controllers, you can move the FSMO roles over with no downtime.

For Exchange, you need a DAG setup so that you can failover mailbox databases to another Exchange server.

For SQL you can either use Cluster servers or SQL Availability Groups to move databases.
to "failover" between hyper-v hosts with local storage and replication, the VM must be off.

it is also possible to "move" a live VM  and its associated storage between hosts, this does not require the VM to be off
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
PowerShell. :)
Pierre AmmounIT ConsultantAuthor Commented:
Why do I need to move roles ? All my servers and Virtual and My host is "only" having windows 2012 R2 with the VMs running on it.

I thought it is a matter of "turning' off the the VMs and firing up the replicas ?
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
A managed failover is done in either the Hyper-V Manager console or PowerShell. Turning off the VMs does nothing as replication continues.
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